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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Mar. 30, 2018	Apr. 27, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	MACOM TECHNOLOGY SOLUTIONS HOLDINGS, INC.
Entity Central Index Key	0001493594
Document Type	10-Q
Document Period End Date	Mar. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--09-28
Entity Filer Category	Large Accelerated Filer
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2018
Entity Common Stock, Shares Outstanding		64,706,145

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Current assets:
Cash and cash equivalents	$ 162,695	$ 130,104
Short term investments	27,396	84,121
Accounts receivable (less allowances of $8,003 and $9,410, respectively)	107,093	136,096
Inventories	143,897	136,074
Income tax receivable	18,970	18,493
Assets held for sale	0	35,571
Prepaid and other current assets	15,158	22,438
Total current assets	475,209	562,897
Property and equipment, net	138,542	131,019
Goodwill	317,094	313,765
Intangible assets, net	584,035	621,092
Deferred income taxes	1,713	948
Other investments	37,415	0
Other long-term assets	7,162	7,402
TOTAL ASSETS	1,561,170	1,637,123
Current liabilities:
Current portion of lease payable	804	815
Current portion of long-term debt	6,885	6,885
Accounts payable	29,224	47,038
Accrued liabilities	51,674	60,237
Liabilities held for sale	0	2,144
Total current liabilities	88,587	117,119
Lease payable, less current portion	23,586	17,275
Long-term debt, less current portion	659,921	661,471
Warrant liability	9,151	40,775
Deferred income taxes	15,975	15,172
Other long-term liabilities	5,684	7,937
Total liabilities	802,904	859,749
Stockholders’ equity:
Common stock	65	64
Treasury stock, at cost	(330)	(330)
Accumulated other comprehensive income	7,173	2,977
Additional paid-in capital	1,057,410	1,041,644
Accumulated deficit	(306,052)	(266,981)
Total stockholders’ equity	758,266	777,374
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,561,170	$ 1,637,123

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 8,003	$ 9,410

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 150,414	$ 186,084	$ 281,338	$ 337,836
Cost of revenue	84,813	117,220	154,784	190,477
Gross profit	65,601	68,864	126,554	147,359
Operating expenses:
Research and development	41,596	39,685	83,246	69,859
Selling, general and administrative	39,287	62,327	76,922	98,822
Impairment charges	6,575	0	6,575	0
Restructuring charges	1,539	469	6,200	1,757
Total operating expenses	88,997	102,481	172,943	170,438
Loss from operations	(23,396)	(33,617)	(46,389)	(23,079)
Other (expense) income
Warrant liability gain (expense)	17,015	(2,573)	31,624	(7,395)
Interest expense, net	(7,970)	(7,374)	(15,209)	(14,724)
Other expense	(4,139)	(898)	(4,133)	(903)
Total other income (expense), net	4,906	(10,845)	12,282	(23,022)
Loss before income taxes	(18,490)	(44,462)	(34,107)	(46,101)
Income tax (benefit) expense	(3,024)	89,805	(1,671)	90,337
Loss from continuing operations	(15,466)	(134,267)	(32,436)	(136,438)
(Loss) income from discontinued operations	(18)	4,136	(5,617)	5,342
Net loss	$ (15,484)	$ (130,131)	$ (38,053)	$ (131,096)
Basic (loss) income per share:
Loss from continuing operations	$ (0.24)	$ (2.21)	$ (0.50)	$ (2.38)
(Loss) income from discontinued operations	0.00	0.07	(0.09)	0.09
Loss per share - basic	(0.24)	(2.14)	(0.59)	(2.29)
Diluted (loss) income per share:
Loss from continuing operations	(0.50)	(2.21)	(0.98)	(2.38)
(Loss) income from discontinued operations	0.00	0.07	(0.09)	0.09
Loss per share - diluted	$ (0.50)	$ (2.14)	$ (1.07)	$ (2.29)
Shares used:
Basic (in shares)	64,549	60,813	64,437	57,276
Diluted (in shares)	65,132	60,813	65,120	57,276

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (15,484)	$ (130,131)	$ (38,053)	$ (131,096)
Unrealized (loss) gain on short term investments, net of tax	(247)	52	(514)	6
Foreign currency translation gain (loss), net of tax	4,421	3,567	4,710	(6,030)
Other comprehensive income (loss), net of tax	4,174	3,619	4,196	(6,024)
Total comprehensive (loss) income	$ (11,310)	$ (126,512)	$ (33,857)	$ (137,120)

Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]
Treasury Stock, Shares			(23)
Balance at beginning of period (in shares) at Sep. 29, 2017		64,279
Balance at beginning of period at Sep. 29, 2017	$ 777,374	$ 64	$ (330)	$ 2,977	$ 1,041,644	$ (266,981)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)		19
Stock options exercises	57				57
Vesting of restricted common stock and units (in shares)		500
Vesting of restricted common stock and units	1	$ 1
Issuance of common stock pursuant to employee stock purchase plan (in shares)		114
Issuance of common stock pursuant to employee stock purchase plan	3,195				3,195
Shares repurchased for stock withholdings on restricted stock awards (in shares)		(184)
Shares repurchased for stock withholdings on restricted stock awards	(3,846)				(3,846)
Share-based compensation	15,342				15,342
Other comprehensive income, net of tax	4,196			4,196
Net loss	(38,053)					(38,053)
Balance at end of period (in shares) at Mar. 30, 2018		64,728
Balance at end of period at Mar. 30, 2018	758,266	$ 65	$ (330)	$ 7,173	1,057,410	(306,052)
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0				$ 1,018	$ (1,018)
Treasury Stock, Shares			(23)

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (38,053)	$ (131,096)
Adjustments to reconcile net loss to net cash provided by operating activities (net of acquisitions):
Depreciation and intangibles amortization	54,439	40,097
Share-based compensation	15,342	17,731
Warrant liability (gain) expense	(31,624)	7,395
Acquired inventory step-up amortization	224	31,373
Deferred financing cost amortization	2,536	1,423
Acquisition prepaid compensation amortization	0	506
Loss on extinguishment of debt	0	871
Gain on disposition of business	0	21,770
Deferred income taxes	(573)	86,123
Impairment related charges	9,143	0
Loss on minority equity investment	4,085	0
Changes in assets held for sale from discontinued operations	(6,237)	0
Other adjustments, net	841	4,334
Change in operating assets and liabilities (net of acquisitions):
Accounts receivable	28,992	(10,879)
Inventories	(9,240)	458
Prepaid expenses and other assets	749	1,358
Accounts payable	(11,438)	(2,219)
Accrued and other liabilities	(4,115)	(7,680)
Income taxes	(3,915)	2,814
Net cash provided by operating activities	11,156	20,839
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of businesses, net	0	(229,423)
Purchases of property and equipment	(26,580)	(16,295)
Proceeds from sale of assets	0	215
Proceeds from sales and maturities of investments	77,853	19,037
Purchases of investments	(21,612)	(26,976)
Purchases of other investments	(5,000)	0
Payments associated with discontinued operations	(263)	21,770
Net cash provided by (used in) investing activities	24,398	(231,672)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from stock option exercises and employee stock purchases	3,252	2,688
Payments on notes payable	(3,442)	(3,026)
Payments of capital leases and assumed debt	(405)	(618)
Repurchase of common stock	(3,846)	(10,027)
Proceeds from corporate facility financing obligation	1,081	4,250
Payments of contingent consideration and other	0	2,517
Net cash used in financing activities	(3,360)	(9,250)
Foreign currency effect on cash	397	(279)
NET CHANGE IN CASH AND CASH EQUIVALENTS	32,591	(220,362)
CASH AND CASH EQUIVALENTS — Beginning of period	130,104	332,977
CASH AND CASH EQUIVALENTS — End of period	162,695
Supplemental disclosure of non-cash activities
Capitalized construction costs for capital leases	9,200
Common stock issued (9,544,125 shares of our common stock at $47.53 per share)	$ 0	$ 465,082

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Mar. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Unaudited Interim Financial Information—The accompanying unaudited, condensed consolidated financial statements have been prepared according to the rules and regulations of the United States (the “U.S.”) Securities and Exchange Commission (“SEC”) and, in the opinion of management, reflect all adjustments, which include normal recurring adjustments, necessary for a fair statement of the condensed consolidated balance sheets, condensed consolidated statements of operations, condensed consolidated statement of comprehensive income (loss), condensed consolidated statements of stockholders' equity and condensed consolidated statements of cash flows of MACOM Technology Solutions Holdings, Inc. (“MACOM”, the “Company”, “us”, “we” or “our”) for the periods presented. We prepare our interim financial information using the same accounting principles we use for our annual audited consolidated financial statements. Certain information and note disclosures normally included in the annual audited consolidated financial statements have been condensed or omitted in accordance with prescribed SEC rules. We believe that the disclosures made in our condensed consolidated financial statements and the accompanying notes are adequate to make the information presented not misleading. The consolidated balance sheet at September 29, 2017 is as reported in our audited consolidated financial statements as of that date. Our accounting policies are described in the notes to our September 29, 2017 consolidated financial statements, which were included in our Annual Report on Form 10-K for our fiscal year ended September 29, 2017 filed with the SEC on November 15, 2017 and our Quarterly Report on Form 10-Q for the fiscal quarter ended December 29, 2017 filed with the SEC on February 7, 2018. We recommend that the financial statements included in this Quarterly Report on Form 10-Q be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for our fiscal year ended September 29, 2017. Principles of Consolidation—We have one reportable segment, semiconductors and modules. The accompanying consolidated financial statements include our accounts and the accounts of our majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. We have a 52 or 53-week fiscal year ending on the Friday closest to the last day of September. The fiscal years 2018 and 2017 include 52 weeks. To offset the effect of holidays, for fiscal years in which there are 53 weeks, we typically include the extra week arising in our fiscal years in the first quarter. Use of Estimates—The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities during the reporting periods, the reported amounts of revenue and expenses during the reporting periods, and the disclosure of contingent assets and liabilities at the date of the financial statements. On an ongoing basis, we base estimates and assumptions on historical experience, currently available information and various other factors that management believes to be reasonable under the circumstances. Actual results may differ materially from these estimates and assumptions. Recent Accounting Pronouncements—Our Recent Accounting Pronouncements are described in the notes to our September 29, 2017 consolidated financial statements, which were included in our Annual Report on Form 10-K for our fiscal year ended September 29, 2017. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers ("Topic 606"). In March, April, May and December 2016, the FASB issued additional guidance related to Topic 606. The new standard will supersede nearly all existing revenue recognition guidance. Under Topic 606, an entity is required to recognize revenue upon transfer of promised goods or services to customers in an amount that reflects the expected consideration to be received in exchange for those goods or services. Topic 606 defines a five-step process in order to achieve this core principle, which may require the use of judgment and estimates, and also requires expanded qualitative and quantitative disclosures relating to the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including significant judgments and estimates used. The new standard also defines accounting for certain costs related to origination and fulfillment of contracts with customers, including whether such costs should be capitalized. The new standard permits adoption either by using (i) a full retrospective approach for all periods presented in the period of adoption or (ii) a modified retrospective approach where the new standard is applied in the financial statements starting with the year of adoption. Under both approaches, cumulative impact of the adoption is reflected as an adjustment to retained earnings (accumulated equity (deficit)) as of the earliest date presented in accordance with the new standard. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers: Deferral of the Effective Date, which delayed the effective date of the new standard from January 1, 2017 to January 1, 2018. We plan to implement the new guidance on September 29, 2018, the beginning of our next fiscal year, using the modified retrospective approach, applied to those contracts that were not completed as of that date. We are currently analyzing the impact of this new accounting standards update. We do not expect the adoption of Topic 606 to have a material impact on our financial position and results of operations. As we continue our evaluation, we are also assessing any disclosure requirements and preparing to implement changes to accounting policies, business processes and internal controls to support the new standard. In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation ("Topic 718"), which simplifies several aspects of the accounting for employee share-based payment transactions for both public and nonpublic entities. We adopted this ASU as of September 30, 2017. Prior to ASU 2016-09, the accounting for share-based compensation required forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. ASU 2016-09 allows an entity to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. ASU 2016-09 requires an entity that elects to account for forfeitures when they occur to apply the accounting change on a modified retrospective basis as a cumulative-effect adjustment to retained earnings as of the date of adoption. We elected to account for forfeitures when they occur, and recorded a $1.0 million cumulative-effect adjustment to beginning retained earnings as of September 30, 2017. We did not record any adjustments to retained earnings for the tax effect of the adoption of ASU 2016-09 as we are in a full valuation allowance position against our U.S deferred tax asset. ASU 2016-09 requires all excess tax benefits and tax deficiencies to be recorded in the consolidated income statement on a prospective basis when the awards vest or are settled. Due to our full U.S. valuation allowance, ASU 2016-09 had no impact to our tax expense for the three and six months ended March 30, 2018.

Acquisitions

6 Months Ended

Mar. 30, 2018

Business Combinations [Abstract]

Acquisitions

ACQUISITIONS

Acquisition of Applied Micro Circuits Corporation— On January 26, 2017, we completed the acquisition of Applied Micro Circuits Corporation (“AppliedMicro”), a global provider of silicon solutions for next-generation cloud infrastructure and Cloud Data Centers, as well as connectivity products for edge, metro and long-haul communications equipment (the “AppliedMicro Acquisition”). We acquired AppliedMicro in order to expand our business in enterprise and Cloud Data Center applications. In connection with the AppliedMicro Acquisition, we acquired all of the outstanding common stock of AppliedMicro for total consideration of $695.4 million, which included cash paid of $287.1 million, less $56.8 million of cash acquired, and equity issued at a fair value of $465.1 million. In conjunction with the equity issued, we granted vested out-of-money stock options and unvested restricted stock units to replace outstanding vested out-of-money stock options and unvested restricted stock units of AppliedMicro. The total fair value of granted vested out-of-money stock options and unvested restricted stock units was $14.5 million, of which $9.3 million was attributable to pre-combination service and was included in the total consideration transferred. We funded the AppliedMicro Acquisition with cash on hand and short term investments. We recorded transaction costs related to the acquisition in selling, general and administrative expense. For the three and six months ended March 30, 2018, we recorded no transaction costs. For the three and six months ended March 31, 2017, we recorded transaction costs of $8.3 million and $11.8 million. The AppliedMicro Acquisition was accounted for as a stock purchase and the operations of AppliedMicro have been included in our consolidated financial statements since the date of acquisition.

We recognized the AppliedMicro assets acquired and liabilities assumed based upon the fair value of such assets and liabilities measured as of the date of acquisition. The aggregate purchase price for AppliedMicro has been allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair value at the date of acquisition. The excess of the purchase price over the fair value of the acquired net assets represents cost and revenue synergies specific to the Company, as well as non-capitalizable intangible assets, such as the employee workforce acquired, and has been allocated to goodwill, none of which will be tax deductible.

In connection with the acquisition of AppliedMicro, we entered into a plan to divest a portion of AppliedMicro's business specifically related to its compute business (the "Compute business"). The divestiture of the Compute business was completed on October 27, 2017. See Note 3 - Discontinued Operations for further details of the divestiture.

The following table summarizes the total estimated acquisition consideration (in thousands):



Cash consideration paid to AppliedMicro common stockholders	$	287,060
Common stock issued (9,544,125 shares of our common stock at $47.53 per share)	453,632
Equity consideration for vested "in the money" stock options and unvested restricted stock units	2,143
Fair value of the replacement equity awards attributable to pre-acquisition service	9,307
Total consideration paid, excluding cash acquired	$	752,142

We finalized the purchase accounting during the fiscal quarter ended December 29, 2017. The final purchase price allocation is as follows (in thousands):



	Preliminary Allocation as of		Allocation Adjustments			Adjusted Allocation
	September 29, 2017		Allocation Adjustments			December 29, 2017

Current assets	$	70,434	$	(553	)	$	69,881
Intangible assets	412,848		—			412,848
Assets held for sale	40,944		—			40,944
Other assets	9,800		—			9,800
Total assets acquired	534,026		(553		)	533,473
Liabilities assumed:
Liabilities held for sale	4,444		—			4,444
Other liabilities	17,627		651			18,278
Total liabilities assumed	22,071		651			22,722
Net assets acquired	511,955		(1,204		)	510,751
Consideration:
Cash paid upon closing	230,298		—			230,298
Common stock issued	455,775		—			455,775
Equity instruments issued	9,307		—			9,307
Total consideration	$	695,380	$	—		$	695,380
Goodwill	$	183,425	$	1,204		$	184,629

The components of the acquired intangible assets were as follows (in thousands):



	Included In Assets Held For Sale		Included in Retained Business		Useful Lives (Years)
Developed technology	$	9,600	$	78,448	7 years
Customer relationships	—		334,400		14 years
Total acquired intangible assets	$	9,600	$	412,848

The overall weighted-average life of the identified intangible assets acquired in the AppliedMicro Acquisition is estimated to be 12.7 years and the assets are being amortized over their estimated useful lives based upon the pattern over which we expect to receive the economic benefit from these assets.

The following is a summary of AppliedMicro revenue and earnings included in our accompanying condensed consolidated statements of operations for the three months ended March 31, 2017 (in thousands):



	Three Months Ended
	March 31, 2017
Revenue	$	36,445
Loss from continuing operations	(30,304		)
Loss from discontinued operations	(16,430		)

The pro forma statements of operations data for the six months ended March 31, 2017, below, give effect to the AppliedMicro Acquisition, described above, as if it had occurred at October 2, 2015. These amounts have been calculated after applying our accounting policies and adjusting the results of AppliedMicro to reflect transaction costs, retention compensation expense, the impact of the step-up to the value of acquired inventory, as well as the additional intangible amortization that would have been charged assuming the fair value adjustments had been applied and incurred since October 2, 2015. This pro forma data is presented for informational purposes only and does not purport to be indicative of our future results of operations.



	Six Months Ended
	March 31, 2017
Revenue	$	394,792
Income from continuing operations	(84,543		)
Loss from discontinued operations	(19,316		)

Acquisition of Picometrix LLC— On August 9, 2017, we completed the acquisition of Picometrix LLC ("Picometrix"), a supplier of optical-to-electrical converters for Cloud Data Center infrastructure (the "Picometrix Acquisition"). We acquired Picometrix in order to expand our business in enterprise and Cloud Data Center applications. The purchase consideration was $33.5 million, comprised of an upfront cash payment of $29.5 million, and $4.0 million placed in escrow for potential satisfaction of certain indemnification obligations that may arise from the closing date through December 15, 2018. For the three and six months ended March 30, 2018, we recorded no transaction costs. The Picometrix Acquisition was accounted for as a business acquisition, and the operations of Picometrix have been included in our consolidated financial statements since the date of acquisition.

We recognized the Picometrix assets acquired and liabilities assumed based upon the fair value of such assets measured as of the date of acquisition. The aggregate purchase price for the Picometrix assets and liabilities has been allocated to the tangible and identifiable intangible assets acquired based on their estimated fair value at the date of acquisition. The excess of the purchase price over the fair value of the acquired assets represents cost and revenue synergies specific to the Company, as well as non-capitalizable intangible assets, such as the employee workforce acquired, and has been allocated to goodwill, all of which will be tax deductible.

The purchase accounting is preliminary and subject to completion including certain fair value measurements, particularly the finalization of the valuation assessment of the acquired tangible and intangible assets. The adjustments arising from the completion of the outstanding matters may materially affect the preliminary purchase accounting.

The preliminary allocation of purchase price as of March 30, 2018 is as follows (in thousands):



	Preliminary Allocation as of		Allocation Adjustments			Adjusted Allocation
	September 29, 2017		Allocation Adjustments			March 30, 2018

Current assets	$	7,375	$	(1,088	)	$	6,287
Intangible assets	19,000		—			19,000
Other assets	3,301		(81		)	3,220
Total assets acquired	29,676		(1,169		)	28,507

Current liabilities	2,169		142			2,311
Other liabilities	190		(77		)	113
Total liabilities assumed	2,359		65			2,424
Net assets acquired	27,317		(1,234		)	26,083
Consideration:
Cash paid upon closing, net of cash acquired	33,500		—			33,500
Goodwill	$	6,183	$	1,234		$	7,417

The pro forma financial information for fiscal year 2017, including revenue and net income, is immaterial, and has not been separately presented.

Discontinued Operations

6 Months Ended

Mar. 30, 2018

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

DISCONTINUED OPERATIONS

On October 27, 2017, we entered into a Purchase Agreement to sell the Compute business. In consideration for the transfer and sale of the Compute business, we received an equity interest in the buyer valued at approximately $36.5 million, and representing less than 20.0% of the buyer's total outstanding equity. The operations of the Compute business were accounted for as discontinued operations through the date of divestiture.

In August 2015, we sold our automotive business (the "Automotive business") to Autoliv ASP Inc. (“Autoliv”), as the Automotive business was not consistent with our long-term strategic vision from both a growth and profitability perspective. Additionally, we entered into a consulting agreement pursuant to which we were to provide Autoliv with certain non-design advisory services for a period of two years following the closing of the transaction for up to $15.0 million (the "Consulting Agreement"). During the three and six months ended March 31, 2017, we recognized $1.9 million and $3.8 million of income, respectively, from the consulting agreement with Autoliv. During the three months ended March 31, 2017, we also received $18.0 million, the full amount of the indemnification escrow. No income was recognized during the three and six months ended March 30, 2018.

The accompanying consolidated statements of operations includes the following operating results related to these discontinued operations (in thousands):



	Three Months Ended						Six Months Ended
	March 30, 2018			March 31, 2017			March 30, 2018			March 31, 2017
Revenue (1)	$	2		$	259		$	—		$	259
Cost of revenue (1)	(56		)	1,620			(596		)	1,620
Gross profit	58			(1,361		)	596			(1,361		)
Operating expenses:
Research and development (1)	(12		)	8,325			4,698			8,325
Selling, general and administrative (1)	88			6,744			1,515			6,744
Total operating expenses	76			15,069			6,213			15,069
Loss from operations	(18		)	(16,430		)	(5,617		)	(16,430		)
Other income (2)	—			1,875			—			3,750
Gain on sale (2)	—			18,022			—			18,022
(Loss) income before income taxes	(18		)	3,467			(5,617		)	5,342
Income tax provision	—			(669		)	—			—
(Loss) income from discontinued operations	$	(18	)	$	4,136		$	(5,617	)	$	5,342

Cash flow from operating activities	(18		)	(29,072		)	(10,327		)	(29,072		)
Cash flow from investing activities	—			21,770			—			21,770

(1) Amounts are associated with the Compute business.

(2) Amounts are associated with the Automotive business.

As it relates to our Quarterly Report on Form 10-Q for the three and six months ended March 31, 2017, we identified an immaterial misstatement in our discontinued operations footnote table with regards to the cash flow amounts of our discontinued operations. The disclosure amounts incorrectly included cash flows from the continuing AppliedMicro business and incorrectly classified the $18.0 million indemnification escrow from the previously discontinued Automotive business, which was received during the three months ended March 31, 2017. Our footnote disclosure in the table above related to the discontinued operations for the three and six months ended March 31, 2017 has been restated to correct this error. The effect of this restatement is outlined below:



	Three and Six Months Ended March 31, 2017
	As reported		As adjusted
Depreciation and amortization	2,535		—
Net cash provided by (used in) operating activities	12,487		(29,072	)
Net cash (used in) provided by investment activities	(663	)	21,770
Net cash used in financing activities	(32,201	)	—

Short Term Investments

6 Months Ended

Mar. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

INVESTMENTS

Our short-term investments are invested in corporate bonds and commercial paper, and are classified as available-for-sale. The amortized cost, gross unrealized holding gains or losses, and fair value of our investments by major investment type as of March 30, 2018 and September 29, 2017 are summarized in the tables below (in thousands):



	March 30, 2018
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Corporate bonds	$	26,476	$	—	$	(677	)	$	25,799
Commercial paper	1,598		—		(1		)	1,597
Total short term investments	$	28,074	$	—	$	(678	)	$	27,396



	September 29, 2017
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Corporate bonds	$	26,366	$	10	$	(166	)	$	26,210
Commercial paper	57,943		4		(36		)	57,911
Total short term investments	$	84,309	$	14	$	(202	)	$	84,121

The contractual maturities of investments were as follows (in thousands):



	March 30, 2018		September 29, 2017
Less than 1 year	$	2,612	$	60,433
Over 1 year	24,784		23,688
Total short term investments	$	27,396	$	84,121

Available-for-sale investments are reported at fair value and as such, their associated unrealized gains and losses are reported as a separate component of stockholders’ equity within accumulated other comprehensive income.

Other Investments— As of March 30, 2018 we held two non-marketable equity investments classified as other long-term investments.

One of these is an investment in a Series B preferred stock ownership of a privately held manufacturing corporation with preferred liquidation rights over other equity shares. This investment had a fair value of $5.0 million at the date of purchase and is held at cost, which approximates fair value. Since we do not have the ability to exercise significant influence or control over the investment we hold this investment at cost, which we evaluate for impairment at each balance sheet date and through March 30, 2018 no impairment has been recorded for this investment.

In addition, we had a minority investment of less than 20.0% of the outstanding equity of a privately held limited liability corporation ("Compute"). This investment was acquired in conjunction with the divestiture of the Compute business during the fiscal quarter ended December 29, 2017 and had an initial value of $36.5 million. This investment value is updated quarterly based on our proportionate share of the losses or earnings of Compute utilizing the equity method. During the three months ended March 30, 2018 we recorded a $4.1 million loss associated with this investment as other expense in our consolidated statement of operations.

Fair Value

6 Months Ended

Mar. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value

FAIR VALUE

We group our financial assets and liabilities measured at fair value on a recurring basis in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are:

Level 1 - Quoted prices in active markets for identical assets or liabilities.

Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets with insufficient volume or infrequent transactions (less active markets), or model-driven valuations in which all significant inputs are observable or can be derived principally from, or corroborated with, observable market data.

Level 3 - Fair value is derived from valuation techniques in which one or more significant inputs are unobservable, including assumptions and judgments made by us.

Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis

We measure certain assets and liabilities at fair value on a recurring basis such as our financial instruments and derivatives. There have been no transfers between Level 1, 2 or 3 assets or liabilities during the three and six months ended March 30, 2018.

Assets and liabilities measured at fair value on a recurring basis consist of the following (in thousands):



	March 30, 2018
	Fair Value		Active Markets for Identical Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Assets
Money market funds	$	179	$	179	$	—	$	—
Commercial paper	65,322		—		65,322		—
Corporate bonds	25,799		—		25,799		—
Total assets measured at fair value	$	91,300	$	179	$	91,121	$	—
Liabilities
Contingent consideration	$	1,130	$	—	$	—	$	1,130
Common stock warrant liability	9,151		—		—		9,151
Total liabilities measured at fair value	$	10,281	$	—	$	—	$	10,281



	September 29, 2017
	Fair Value		Active Markets for Identical Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Assets
Money market funds	$	36	$	36	$	—	$	—
Commercial paper	57,911		—		57,911		—
Corporate bonds	26,210		—		26,210		—
Total assets measured at fair value	$	84,157	$	36	$	84,121	$	—
Liabilities
Contingent consideration	$	1,679	$	—	$	—	$	1,679
Common stock warrant liability	40,775		—		—		40,775
Total liabilities measured at fair value	$	42,454	$	—	$	—	$	42,454

As of March 30, 2018 and September 29, 2017, the fair value of the common stock warrants has been estimated using a Black-Scholes option pricing model.

The quantitative information utilized in the fair value calculation of our Level 3 liabilities is as follows:



			Inputs
Liabilities	Valuation Technique	Unobservable Input	March 30, 2018	September 29, 2017
Contingent consideration	Discounted cash flow	Discount rate	9.2%	9.2%
		Probability of achievement	80% - 90%	70% - 100%
		Timing of cash flows	2 months	2 - 8 months

Warrant liability	Black-Scholes model	Volatility	55.6%	44.9%
		Discount rate	2.39%	1.62%
		Expected life	2.7 years	3.2 years
		Exercise price	$14.05	$14.05
		Stock price	$16.60	$44.61
		Dividend rate	—%	—%

The fair values of the contingent consideration liabilities were estimated based upon a risk-adjusted present value of the probability-weighted expected payments by us. Specifically, we considered base, upside and downside scenarios for the operating metrics upon which the contingent payments are to be based. Probabilities were assigned to each scenario and the probability weighted payments were discounted to present value using risk-adjusted discount rates.

The changes in liabilities with inputs classified within Level 3 of the fair value hierarchy consist of the following (in thousands):



	September 29, 2017		Net Realized/Unrealized Gains Included in Earnings			Purchases and Issuances		Sales and Settlements		March 30, 2018
Contingent consideration	$	1,679	$	(549	)	$	—	$	—	$	1,130
Common stock warrant liability	$	40,775	$	(31,624	)	$	—	$	—	$	9,151



	September 30, 2016		Net Realized/Unrealized Losses Included in Earnings		Purchases and Issuances		Sales and Settlements			March 31, 2017
Contingent consideration	$	848	$	33	$	—	$	(400	)	$	481
Common stock warrant liability	$	38,253	$	7,395	$	—	$	—		$	45,648

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Inventories

6 Months Ended

Mar. 30, 2018

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

Inventories, net of reserves, consist of the following (in thousands):



	March 30, 2018		September 29, 2017
Raw materials	$	90,652	$	78,999
Work-in-process	13,022		13,962
Finished goods	40,223		43,113
Total inventory, net	$	143,897	$	136,074

Property, Plant and Equipment

6 Months Ended

Mar. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consists of the following (in thousands):



	March 30, 2018			September 29, 2017
Construction in process	$	27,207		$	22,195
Machinery and equipment	174,817			160,955
Leasehold improvements	13,232			13,809
Furniture and fixtures	2,411			2,078
Computer equipment and software	17,086			16,539
Capital lease assets	20,764			20,410
Total property and equipment	$	255,517		$	235,986
Less accumulated depreciation and amortization	(116,975		)	(104,967		)
Property and equipment, net	$	138,542		$	131,019

Depreciation and amortization expense related to property, plant and equipment for the three and six months ended March 30, 2018 was $7.6 million and $15.4 million, respectively. Depreciation and amortization expense related to property, plant and equipment for the three and six months ended March 31, 2017 was $7.2 million and $13.1 million, respectively.

Debt

6 Months Ended

Mar. 30, 2018

Debt Disclosure [Abstract]

Debt

DEBT

As of March 30, 2018, we are party to a credit agreement dated as of May 8, 2014 with a syndicate of lenders and Goldman Sachs Bank USA, as administrative agent (as amended on February 13, 2015, August 31, 2016, March 10, 2017 and May 19, 2017, the “Credit Agreement”). As of March 30, 2018, the Credit Agreement consisted of term loans with an aggregate principal amount of $700.0 million (“Term Loans”) and a revolving credit facility with an aggregate borrowing capacity of $160.0 million (“Revolving Facility”). The Revolving Facility will mature in May 2019 and the Term Loans will mature in May 2024 and bear interest at: (i) for LIBOR loans for any interest period, a rate per annum equal to the LIBOR rate as determined by the administrative agent, plus an applicable margin of 2.25%; and (ii) for base rate loans, a rate per annum equal to the greater of (a) the prime rate quoted in the print edition of the Wall Street Journal, Money Rates Section, (b) the federal funds rate plus one-half of 1.00% and (c) the LIBOR rate applicable to a one-month interest period plus 1.00% (but, in each case, not less than 1.00%), plus an applicable margin of 1.25%.

All principal amounts outstanding and interest rate information as of March 30, 2018, for the Credit Agreement were as follows (in millions, except rate data):



	Principal Outstanding	LIBOR Rate	Margin	Effective Interest Rate
Term loans	$683.3	1.89%	2.25%	4.14%

As of March 30, 2018, approximately $11.8 million of deferred financing costs remain unamortized, of which $11.3 million is related to the Term Loans and is recorded as a direct reduction of the recognized debt liabilities in our accompanying consolidated balance sheet, and $0.5 million is related to the Revolving Facility and is recorded in other long-term assets in our accompanying consolidated balance sheet.

The Term Loans are secured by a first priority lien on substantially all of our assets and provide that we must comply with certain financial and non-financial covenants.

As of March 30, 2018, we had $160.0 million of borrowing capacity under our Revolving Facility.

As of March 30, 2018, the following remained outstanding on the Term Loans (in thousands):



Principal balance	$	683,298
Unamortized discount	(5,230		)
Unamortized deferred financing costs	(11,262		)
Total term loans	$	666,806
Current portion	6,885
Long-term, less current portion	$	659,921

As of March 30, 2018, the minimum principal payments under the Term Loans in future fiscal years were as follows (in thousands):



2018 (rest of fiscal year)	$	3,442
2019	6,885
2020	6,885
2021	6,885
2022	6,885
Thereafter	652,316
Total	$	683,298

The fair value of the Term Loans was estimated to be approximately $692.7 million as of March 30, 2018 and was determined using Level 2 inputs, including a quoted rate from a bank.

Capital Lease and Financing Obligations Capital Lease and Financing Obligations

6 Months Ended

Mar. 30, 2018

Leases [Abstract]

Capital Lease Obligations

9. CAPITAL LEASE AND FINANCING OBLIGATIONS

Corporate Facility Financing Obligation

On May 26, 2016, we entered into a Purchase and Sale Agreement (the “Purchase and Sale Agreement”) with Calare Properties, Inc. (together with its affiliates, “Calare”), for the sale and subsequent leaseback of our corporate headquarters, located at 100 Chelmsford Street, Lowell, Massachusetts. The transactions contemplated by the Purchase and Sale Agreement closed on December 28, 2016, at which time we also entered into three lease agreements with Calare including: (1) a 20 year leaseback of the facility located at 100 Chelmsford Street (the “100 Chelmsford Lease”), (2) a 20 year build-to-suit lease arrangement for the construction and subsequent lease back of a new facility to be located at 144 Chelmsford Street (the “144 Chelmsford Lease”), and (3) a 14 year building lease renewal of an adjacent facility at 121 Hale Street (the “121 Hale Lease”, and together with the 100 Chelmsford Lease and the 144 Chelmsford Lease, the “Leases”).

Because the transactions contemplated by the Purchase and Sale Agreement and the related Leases were negotiated and consummated at the same time and in contemplation of one another to achieve the same commercial objective, the transactions are accounted for by us as a single unit of accounting. In addition, the Leases were determined to represent a failed sale-leaseback due to our continuing involvement in the properties in the form of non-recourse financing. As a result, the Leases are accounted for under the financing method and we will be deemed the accounting owner under the arrangement, including the assets to be constructed under the 144 Chelmsford Lease. We will continue to recognize the existing building and improvements sold under the Purchase and Sale Agreement, capitalize the 121 Hale Street building as well as the assets constructed under the Leases, and depreciate the assets over the shorter of their estimated useful lives or the lease terms. The sale proceeds from the Purchase and Sale Agreement of $8.2 million (which includes $4.2 million in cash and $4.0 million in construction allowances) and the fair value of the 121 Hale Street building of $4.0 million were recognized as a financing obligation on our consolidated balance sheet and are being amortized over the 20 year lease term based on the minimum lease payments required under the Leases and our incremental borrowing rate. Future construction costs funded by Calare under the 144 Chelmsford Lease will be recognized as additional financing obligations on our consolidated balance sheet as incurred, and will be amortized over the 20 year lease term based on the minimum lease payments required under the Leases and our incremental borrowing rate.

As a result of the failed sale-leaseback accounting, we calculated a financing obligation based on the future minimum lease payments discounted at 8.6% as of March 30, 2018. The discount rate represents the estimated incremental borrowing rate over the lease term of 20 years. The minimum lease payments are recorded as interest expense and in part as a payment of principal reducing the financing obligation. The real property assets in the transaction remain on the consolidated balance sheets and continue to be depreciated over the remaining useful lives. As of March 30, 2018, approximately $22.4 million of the financing obligation was outstanding associated with the Leases, of which $10.2 million was associated with the 144 Chelmsford Lease that has not yet been placed in service.

Additionally, we have certain capital equipment lease obligations, of which approximately $1.9 million was outstanding as of March 30, 2018.

As of March 30, 2018, future minimum payments under capital lease obligations and financing obligations related to the Leases were as follows (in thousands):



Fiscal year ending:	Amount
2018 (rest of fiscal year)	$	950
2019	1,809
2020	1,626
2021	1,483
2022	1,260
Thereafter	20,462
Total minimum capital lease payments	27,590
Less amount representing interest	(15,267		)
Present value of net minimum capital lease payments (1)	$	12,323

Intangible Assets

6 Months Ended

Mar. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

INTANGIBLE ASSETS

Amortization expense related to intangible assets is as follows (in thousands):



	Three Months Ended				Six Months Ended
	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
Cost of revenue	$	8,172	$	7,276	$	16,319	$	13,278
Selling, general and administrative	11,753		7,163		22,746		13,630
Total	$	19,925	$	14,439	$	39,065	$	26,908

Intangible assets consist of the following (in thousands):



	March 30, 2018			September 29, 2017
Acquired technology	$	252,025		$	251,655
Customer relationships	558,287			556,648
Trade name	3,400			3,400
Total	$	813,712		$	811,703
Less accumulated amortization	(229,677		)	(190,611		)
Intangible assets — net	$	584,035		$	621,092

Our trade name is an indefinite-lived intangible asset. A summary of the activity in intangible assets and goodwill follows (in thousands):



	Intangible Assets
	Total Intangible Assets		Acquired Technology		Customer Relationships		Trade Name		Goodwill
Balance at September 29, 2017	$	811,703	$	251,655	$	556,648	$	3,400	$	313,765
Fair value adjustment	—		—		—		—		2,437
Currency translation adjustment	2,009		370		1,639		—		892
Balance at March 30, 2018	$	813,712	$	252,025	$	558,287	$	3,400	$	317,094

As of March 30, 2018, our estimated amortization of our intangible assets in future fiscal years was as follows (in thousands):



	2018 Remaining		2019	2020	2021	2022	Thereafter	Total
Amortization expense	$	45,812	90,428	86,978	78,186	65,023	214,208	$	580,635

Accumulated amortization for acquired technology and customer relationships were $123.0 million and $106.7 million, respectively, as of March 30, 2018, and $106.8 million and $83.9 million, respectively, as of September 29, 2017.

Stockholders' Equity	6 Months Ended
Stockholders' Equity	Mar. 30, 2018
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS' EQUITY We have authorized 10 million shares of $0.001 par value preferred stock and 300 million shares of $0.001 par value common stock as of March 30, 2018 and September 29, 2017. Common Stock Warrants—In March 2012, we issued warrants to purchase 1,281,358 shares of common stock for $14.05 per share. The warrants expire December 21, 2020, or earlier as per the terms of the agreement, including immediately following consummation of a sale of all or substantially all assets or capital stock or other equity securities, including by merger, consolidation, recapitalization, or similar transactions. We do not currently have sufficient registered and available shares to immediately satisfy a request for registration, if such a request were made. As of March 30, 2018, no exercise of the warrants had occurred and no request had been made to register the warrants or any underlying securities for resale by the holders. We are recording the estimated fair values of the warrants as a long-term liability in the accompanying consolidated financial statements with changes in the estimated fair value being recorded in the accompanying statements of operations. See Note 5 - Fair Value for additional information related to the fair value of our warrant liability.

Earnings (Loss) Per Share

6 Months Ended

Mar. 30, 2018

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

EARNINGS (LOSS) PER SHARE

The following table sets forth the computation for basic and diluted net loss per share of common stock (in thousands, except per share data):



	Three Months Ended						Six Months Ended
	March 30, 2018			March 31, 2017			March 30, 2018			March 31, 2017
Numerator:
Loss from continuing operations	$	(15,466	)	$	(134,267	)	$	(32,436	)	$	(136,438	)
(Loss) income from discontinued operations	(18		)	4,136			(5,617		)	5,342
Net loss	$	(15,484	)	$	(130,131	)	$	(38,053	)	$	(131,096	)
Warrant liability gain	(17,015		)	—			(31,624		)	—
Net loss attributable to common stockholders	$	(32,499	)	$	(130,131	)	$	(69,677	)	$	(131,096	)
Denominator:
Weighted average common shares outstanding-basic	64,549			60,813			64,437			57,276
Dilutive effect of warrants	583			—			683			—
Weighted average common shares outstanding-diluted	65,132			$	60,813		$	65,120		$	57,276
(Loss) earnings per share-basic:
Continuing operations	$	(0.24	)	$	(2.21	)	$	(0.50	)	$	(2.38	)
Discontinued operations	0.00			0.07			(0.09		)	0.09
Net loss to common stock holders per share-basic	$	(0.24	)	$	(2.14	)	$	(0.59	)	$	(2.29	)
(Loss) earnings per share-diluted:
Continuing operations	$	(0.50	)	$	(2.21	)	$	(0.98	)	$	(2.38	)
Discontinued operations	0.00			0.07			(0.09		)	0.09
Net loss to common stock holders per share-diluted	$	(0.50	)	$	(2.14	)	$	(1.07	)	$	(2.29	)

As of March 30, 2018, we had warrants outstanding which were reported as a liability on the consolidated balance sheet. During the three and six months ended March 30, 2018, we recorded a $17.0 million gain and a $31.6 million gain, respectively, associated with adjusting the fair value of the warrants, in the consolidated statement of operations primarily as a result of changes in our stock price. When calculating earnings per share we are required to adjust for any changes in income or loss to show the maximum dilution possible and therefore during the quarter, we adjusted the numerator by the warrant gains of $17.0 million and $31.6 million, respectively, and denominator by the incremental shares of 582,889 and 683,198, respectively, under the treasury stock method. The table above excludes the effects of 477,212 and 488,521 shares, respectively, for the three months and six months ended March 30, 2018, of potential shares of common stock issuable upon exercise of stock options, restricted stock and restricted stock units as the inclusion would be antidilutive. The table above excludes the effects of 2,030,744 and 1,953,035 shares, respectively, for the three and six months ended March 31, 2017, of potential shares of common stock issuable upon exercise of stock options, warrants, restricted stock and restricted stock units as the inclusion would be antidilutive.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Mar. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES From time to time, we may be subject to commercial disputes, employment issues, claims by other companies in the industry that we have infringed their intellectual property rights and other similar claims and litigations. Any such claims may lead to future litigation and material damages and defense costs. Other than as set forth below, we were not involved in any material pending legal proceedings during the fiscal quarter ended March 30, 2018. GaN Lawsuit Against Infineon. On April 26, 2016, we and our wholly-owned subsidiary Nitronex, LLC brought suit against Infineon Technologies Americas Corporation ("Infineon Americas") and Infineon Technologies AG ("Infineon AG" and collectively, with Infineon Americas, "Infineon") in the Federal District Court for the Central District of California, seeking injunctive relief, monetary damages, and specific performance of certain contractual obligations. On July 19, 2016, we filed a first amended complaint, and, on November 21, 2016, we filed a second amended complaint. After motions to dismiss certain claims from MACOM’s second amended complaint were denied on February 28, 2017, Infineon AG answered on March 24, 2017, asserting no counterclaims. Infineon Americas also answered and counterclaimed on March 24, 2017 and then submitted amended counterclaims on April 14, 2017. The district court dismissed one of the counterclaims on June 5, 2017, and Infineon filed further amended counterclaims on June 19, 2017. MACOM answered the counterclaims on August 16, 2017. On March 14, 2018, MACOM filed a third amended complaint, which Infineon answered on March 28, 2018. The suit arises out of agreements relating to GaN-on-Silicon ("GaN") patents that were executed in 2010 by Nitronex Corporation (acquired by us in 2014) and International Rectifier Corporation ("International Rectifier") (acquired by Infineon AG in 2015). We assert claims for breach of contract, breach of the covenant of good faith and fair dealing, declaratory judgment of contractual rights, declaratory judgment of non-infringement of patents, and, against Infineon AG only, intentional interference with contract. If successful, the relief sought in our second amended complaint would, among other remedies, require Infineon to assign back to us certain GaN-related Nitronex patents that were previously assigned to International Rectifier and enjoin Infineon from proceeding with its marketing and sales of certain types of GaN products. In an order dated October 31, 2016, the district court granted us a preliminary injunction against Infineon, which then issued on December 7, 2016 and was modified on March 6, 2017. The preliminary injunction declared, among other things, that a licensing agreement between us and Infineon that Infineon had purported to terminate is still in effect. On January 29, 2018, the Federal Circuit affirmed the district court’s decision to enter a preliminary injunction declaring the license agreement to still be in effect, although it reversed other aspects of the district court’s decision. Meanwhile, the district court case has been proceeding, and trial is set to begin on February 26, 2019. With respect to the above legal proceeding, we are not able to reasonably estimate the amount or range of any possible loss, and accordingly have not accrued or disclosed any related amounts of possible loss in the accompanying consolidated financial statements.

Restructurings

6 Months Ended

Mar. 30, 2018

Restructuring and Related Activities [Abstract]

Restructurings

RESTRUCTURINGS

We have periodically implemented restructuring actions in connection with broader plans to reduce staffing, reduce our internal manufacturing footprint and, generally, reduce operating costs. The restructuring expenses are primarily comprised of direct and incremental costs related to headcount reductions including severance and outplacement fees for the terminated employees, as well as facility closure costs.

During the fiscal quarter ended December 29, 2017, we initiated plans to restructure our facility in Long Beach, California and to close our facilities in Belfast, the United Kingdom and Sydney, Australia. As of March 30, 2018, the operations from the Long Beach facility have been consolidated into our other California locations in order to achieve operational synergies. The Belfast and Sydney facilities have been closed as we have discontinued certain product development activities that were performed in those locations. The following is a summary of the restructuring charges incurred for the three and six months ended March 30, 2018 under these restructuring plans:



	Three Months Ended				Six Months Ended
	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
Employee related expenses	$	221	$	469	$	2,792	$	1,757
Facility related expenses	1,318		—		3,408		—
Total restructuring charges	$	1,539	$	469	$	6,200	$	1,757

The following is a summary of the costs incurred for the six months ended March 30, 2018 and the remaining balances included in accrued expenses at March 30, 2018 (in thousands):



Balance as of September 29, 2017	$	627
Current period expense	6,200
Charges paid/settled, net	(4,777		)
Balance as of March 30, 2018	$	2,050

Our remaining accrued restructuring expenses are expected to be paid through the remainder of fiscal year 2018. We expect to incur additional restructuring costs of approximately $0.1 million to $0.5 million during the remainder of fiscal year 2018 as we complete these restructuring actions.

Share-Based Compensation

6 Months Ended

Mar. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

SHARE-BASED COMPENSATION

Stock Plans

As of March 30, 2018, we had 14.0 million shares available for future issuance under our 2012 Omnibus Incentive Plan (as Amended and Restated) (the “2012 Plan”), and 3.4 million shares available for issuance under our Employee Stock Purchase Plan (“ESPP”). Under the 2012 Plan, we have the ability to issue incentive stock options (“ISOs”), non-statutory stock options (“NSOs”), performance based non-statutory stock options, stock appreciation rights, restricted stock (“RSAs”), restricted stock units (“RSUs”), performance-based stock units (“PRSUs”), performance shares and other equity-based awards to employees, directors and outside consultants. The ISOs and NSOs must be granted at a price per share not less than the fair value of our common stock on the date of grant. Options granted to date primarily vest based on certain market-based and performance-based criteria as described below. Options granted generally have a term of seven to ten years. Certain of the share-based awards granted and outstanding as of March 30, 2018 are subject to accelerated vesting upon a change in control. There were no modifications to share-based awards during the periods presented.

Share-Based Compensation

The following table shows a summary of share-based compensation expense included in the Condensed Consolidated Statements of Operations for the three and six months ended March 30, 2018 and March 31, 2017 (in thousands):



	Three Months Ended				Six Months Ended
	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
Cost of revenue	$	917	$	679	$	1,862	$	1,399
Research and development	2,976		2,727		6,637		4,671
Selling, general and administrative	1,457		6,144		6,843		11,661
Total share-based compensation expense	$	5,350	$	9,550	$	15,342	$	17,731

As of March 30, 2018, the total unrecognized compensation costs related to outstanding stock options, restricted stock awards and units including awards with time-based and performance based vesting was $69.1 million, which we expect to recognize over a weighted-average period of 2.7 years. As of March 30, 2018, total unrecognized compensation cost related to the employee stock purchase plan was $0.4 million.

Stock Options

We had 1.5 million stock options outstanding as of March 30, 2018, with a weighted-average exercise price per share of $33.10 and weighted-average remaining contractual term of 5.3 years. The aggregate intrinsic value of the stock options outstanding as of March 30, 2018 was $1.2 million which represents our closing stock price value on the last trading day of the period in excess of the weighted-average exercise price multiplied by the number of options outstanding.

We had 0.4 million stock options exercisable as of March 30, 2018, with a weighted-average exercise price per share of $24.23 and weighted-average remaining contractual term of 3.8 years. The aggregate intrinsic value of the stock options exercisable as of March 30, 2018 was $1.2 million which represents our closing stock price value on the last trading day of the period in excess of the weighted-average exercise price multiplied by the number of options exercisable.

During November 2017, we granted 325,000 non-qualified stock options with a grant date fair value of $5.0 million that are subject to vesting only upon the market price of our underlying public stock closing above a certain price target within seven years of the date of grant. These non-qualified stock options with market related vesting conditions are valued using a Monte Carlo simulation model, using a volatility rate of 45.8%, a risk-free rate of 2.26%, a weighted-average strike price of $36.58 and a term of seven years. Share-based compensation expense is recognized regardless of the number of awards that are earned based on the market condition and is recognized on a straight-line basis over the estimated service period of approximately three years. If the required service period is not met for these options then the share-based compensation expense would be reversed. In the event that our common stock achieves the target price of $98.99 per share based on a 30 days trailing average prior to the end of the estimated service period, any remaining unamortized compensation cost will be recognized.

During November 2017, we also granted 10,924 incentive stock options and 69,076 non-qualified stock options with a total grant date fair value of $1.4 million. These stock options are valued using a Black Scholes model, using a volatility rate of 45.7%, a risk-free rate of 2.21%, a strike price of $36.61 and an expected term of 6.5 years. Share-based compensation expense is recognized on a straight-line basis over the service period of approximately 4.5 years. If the required service period is not met for these options then the share-based compensation expense would be reversed.

The total intrinsic value of options exercised was $0.2 million and $0.7 million for the three and six months ended March 30, 2018, respectively, and was $0.3 million and $1.8 million for the three and six months ended March 31, 2017, respectively.

Restricted Stock, Restricted Stock Units and Performance-Based Restricted Stock Units

A summary of restricted stock, restricted stock unit and performance-based restricted stock unit activity for the six months ended March 30, 2018, is as follows (in thousands, except per share data):



	Number of RSUs		Weighted- Average Grate Date Fair Value		Aggregate Intrinsic Value (in thousands)
Balance at September 29, 2017	1,907		$	39.20	$	72,165
Granted	901		26.07
Vested and released	(500	)	37.10
Forfeited, canceled or expired	(132	)	32.97
Balance at March 30, 2018	2,176		$	34.63	$	36,015

Restricted stock, restricted stock units and performance-based restricted stock units that vested during the six months ended March 30, 2018 and March 31, 2017 had fair value of $10.4 million and $10.0 million as of the vesting date, respectively.

Income Taxes

6 Months Ended

Mar. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

We are subject to income tax in the U.S. as well as other tax jurisdictions in which we conduct business. Earnings from non-U.S. activities are subject to local country income tax and may also be subject to current U.S. income tax. For interim periods, we record a tax provision or benefit based upon the estimated effective tax rate expected for the full fiscal year, adjusted for material discrete taxation matters arising during the interim periods.

The difference between the U.S. federal statutory income tax rate of 35% and our effective income tax rate for the three and six months ended March 31, 2017, was primarily driven by the establishment of a valuation allowance against our U.S. deferred tax assets. For the fiscal year ending September 28, 2018, our blended U.S. federal income tax rate is expected to be 24.5%. The difference between the U.S. federal statutory income tax rate of 24.5% and our effective income tax rate for the three and six months ended March 30, 2018 was primarily impacted by a full valuation allowance against any benefit associated with U.S. losses and income taxed in foreign jurisdictions at generally lower tax rates.

We recognize deferred tax assets to the extent that we believe that these assets are more likely than not to be realized. In making this determination, we consider available positive and negative evidence and factors that may impact the valuation of our deferred tax asset including results of recent operations, future reversals of existing taxable temporary differences, projected future taxable income, and tax-planning strategies. A significant piece of objective negative evidence evaluated was the cumulative U.S. loss initially incurred over the three-year period ended March 31, 2017, which we believe limited our ability to consider other subjective evidence, such as our projections for future growth. Certain transaction and integration related expenses incurred in the U.S. primarily associated with the AppliedMicro Acquisition during the three months ended March 31, 2017 resulted for the first time in significant negative objective evidence in the form of adjusted cumulative losses in the U.S. over the past three-year period. This resulted in our determination during the fiscal quarter ended March 31, 2017 that there was not sufficient objectively verifiable positive evidence to offset this negative objective evidence and we concluded that a full valuation allowance was required for our U.S. deferred tax assets. Significant negative objective evidence in the form of adjusted cumulative losses in the U.S. over the past three-year period ended March 30, 2018 resulted in our continued determination that there was not sufficient objectively verifiable positive evidence to offset this negative objective evidence and we concluded that a full valuation allowance was still appropriate for our U.S. deferred tax assets.

The balance of the unrecognized tax benefit as of March 30, 2018 and September 29, 2017 was $0.3 million and $1.7 million, respectively. The decrease of $1.4 million was primarily the result of an audit settlement of our 2014 U.S. tax filings during the three months ended March 30, 2018. The unrecognized tax benefits as of March 30, 2018 primarily relate to positions taken by us in our foreign tax filings. The entire balance of unrecognized tax benefits, if recognized, will reduce income tax expense. It is our policy to recognize any interest and penalties accrued related to unrecognized tax benefits in income tax expense. During the fiscal quarters ended March 30, 2018 and September 29, 2017, we did not make any accrual or payment of interest and penalties.

On December 22, 2017, the U.S. Congress enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code, including, but not limited to,


•	reducing the highest marginal U.S. federal corporate income tax rate from 35% in the period ending December 29, 2017 to 21%, effective January 1, 2018;


•	requiring companies to become liable for a one-time deemed repatriation transition tax (“Transition Tax”) based on previously untaxed accumulated and current earnings and profits (“E&P”) of certain foreign subsidiaries for our year ending September 28, 2018;


•	generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries that would apply to our year beginning September 29, 2018;


•	requiring the inclusion of certain income such as Global Intangible Low Taxed Income (“GILTI”) earned by controlled foreign corporations (“CFCs”) in our U.S. federal taxable income that would apply to our year beginning September 29, 2018;


•	eliminating the corporate alternative minimum tax (“AMT”) and changing how existing AMT credits can be realized that would apply to our year beginning September 29, 2018;


•	repealing the performance-based compensation exception to the section 162(m) $1.0 million deduction limitation and revising the definition of a covered employee for our year beginning September 29, 2018;


•	creating the base erosion anti-abuse tax, a new minimum tax that would apply to our year beginning September 29, 2018;


•	creating a new limitation on deductible interest expense that would apply to our year beginning September 29, 2018;


•	limiting the degree to which net operating losses can be utilized against taxable income that would apply to losses created beginning with our year beginning September 29, 2018;


•	changing rules related to the ability to apply net operating losses against later or earlier tax years that would apply to losses created beginning with our year beginning September 30, 2017; and


•	an increase in the allowable deduction for costs to acquire qualified property placed into service after September 27, 2017.

Based on preliminary calculations, we currently estimate that our financial results for the fiscal year ending September 28, 2018 will include a non-cash reduction in income tax expense of approximately $3.7 million resulting primarily from the re-measurement of our U.S. deferred tax liabilities to reflect the new 21% U.S. federal tax rate. For the fiscal year ending September 28, 2018, our blended U.S. federal income tax rate is expected to be 24.5%.

To determine the amount of the Transition Tax, we must determine, in addition to other factors, the amount of E&P of the relevant subsidiaries as well as the amount of non-U.S. income taxes paid on such earnings. We were able to make a reasonable estimate of the Transition Tax and have determined that we expect to have sufficient net operating losses to reduce any cash tax payments associated with the one-time repatriation of E&P down to the alternative minimum tax, which we estimate to be less than $1.0 million. On a preliminary basis we have estimated the one-time repatriation of E&P would result in a release of the valuation allowance corresponding with utilization of our U.S. Net Operating Loss ("NOL"), resulting in no impact to our tax expense for the six months ended March 30, 2018. We are continuing to analyze additional information to more precisely compute the amount of the Transition Tax.

The Tax Act creates a new requirement that certain income such as GILTI earned by CFCs must be included in the gross income of the CFCs’ U.S. shareholder. GILTI is the excess of the shareholder's net CFC tested income over the net deemed tangible income return, which is currently defined as the excess of (1) 10 percent of the aggregate of the U.S. shareholder’s pro rata share of the qualified business asset investment of each CFC with respect to which it is a U.S. shareholder over (2) the amount of certain interest expense taken into account in the determination of net CFC-tested income.

The Company must assess whether its valuation allowance analyses are affected by various aspects of the Tax Act (e.g., the Transition Tax, GILTI inclusions and new categories of foreign tax credits). The changes included in the Tax Act are broad and complex. Although we are not able to finalize our evaluation of the impact of the Tax Act at this time due to uncertainties related to any future legislative or regulatory actions related to the Tax Act and availability of information needed to perform the final calculations, we do believe that a full valuation allowance continues to be required. However, we will continue to evaluate the impact the Tax Act may have on our financial statements including the impact on our full valuation allowance against our U.S. deferred tax assets and any impact this would have on our tax expense.

The Securities Exchange Commission has issued Staff Accounting Bulletin No. 118 that would allow for a measurement period of up to one year after the enactment date of the Tax Act to finalize the application of Accounting Standards Codification Topic 740, Income Taxes. We currently anticipate finalizing and recording any resulting adjustments by the end of our current fiscal year ending September 28, 2018.

Related Party Transactions	6 Months Ended
Related Party Transactions	Mar. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS Cadence Design Systems, Inc. ("Cadence") provides us with certain engineering licenses on an ongoing basis. Geoffrey Ribar, who joined our Board of Directors on March 22, 2017, served as an officer of Cadence through September 30, 2017 and served as a Senior Advisor of Cadence until March 31, 2018. During the six months ended March 30, 2018, we made payments of $4.1 million to Cadence. During the six months ended March 31, 2017, we made payments of $1.5 million to Cadence subsequent to Mr. Ribar joining the Board of Directors.

Supplemental Cash Flow Information

6 Months Ended

Mar. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

SUPPLEMENTAL CASH FLOW INFORMATION

As of March 30, 2018 and March 31, 2017, we had $1.5 million and $1.1 million in unpaid amounts related to purchases of property and equipment included in accounts payable and accrued liabilities during each period, respectively. These amounts have been excluded from the payments for purchases of property and equipment in the accompanying condensed consolidated statements of cash flows until paid.

During the six months ended March 30, 2018, we capitalized $9.2 million of net construction costs relating to the 144 Chelmsford Street facility, of which $7.1 million was accounted for as a non-cash transaction as the costs were paid by the developer.

During the six months ended March 30, 2018, we divested the Compute business with net assets valued at approximately $36.5 million in exchange for a $36.5 million equity interest in Compute. During the six months ended March 30, 2018, we recorded a $4.1 million loss associated with this investment based on our proportionate share of the losses or earnings of the Compute.

In January 2017, we issued common stock with a fair value of $465.1 million in connection with the AppliedMicro Acquisition. This was accounted for as a non-cash transaction as no shares were purchased or sold as part of the transaction.

The following is supplemental cash flow information regarding non-cash investing and financing activities (in thousands):



	Six Months Ended
	March 30, 2018		March 31, 2017
Cash paid for interest	$	14,094	$	16,668
Cash paid (refunded) for income taxes	$	4,065	$	(720	)

Geographic and Significant Customer Information

6 Months Ended

Mar. 30, 2018

Segment Reporting [Abstract]

Geographic and Significant Customer Information

GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION

We have one reportable operating segment that designs, develops, manufactures and markets semiconductors and modules. The determination of the number of reportable operating segments is based on the chief operating decision maker’s use of financial information for the purposes of assessing performance and making operating decisions. In evaluating financial performance and making operating decisions, the chief operating decision maker primarily uses consolidated revenue, gross profit and operating income (loss).

Information about our operations in different geographic regions, based upon customer locations, is presented below (in thousands):



	Three Months Ended				Six Months Ended
Revenue by Geographic Region	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
United States	$	74,323	$	66,223	$	129,679	$	110,184
China	38,364		56,534		76,052		116,835
Asia Pacific, excluding China (1)	23,347		48,613		46,232		85,541
Other Countries (2)	14,380		14,714		29,375		25,276
Total	$	150,414	$	186,084	$	281,338	$	337,836


(1)	Asia Pacific represents Taiwan, Japan, Singapore, India, Thailand, South Korea, Australia, Malaysia, New Zealand, the Philippines and Vietnam.


(2)	No international country or region represented greater than 10% of the total revenue as of the dates presented, other than China and the Asia Pacific region as presented above.



	As of
Long-Lived Assets by Geographic Region	March 30, 2018		September 29, 2017
United States	$	102,064	$	101,044
Asia Pacific (1)	33,001		24,945
Other Countries (2)	3,477		5,030
Total	$	138,542	$	131,019


(1)	Asia Pacific represents Taiwan, India, Japan, Thailand, South Korea, Australia, Malaysia, New Zealand, the Philippines, Vietnam and China.


(2)	No international country or region represented greater than 10% of the total net long-lived assets as of the dates presented, other than the Asia Pacific region as presented above.

The following is a summary of customer concentrations as a percentage of revenue and accounts receivable as of and for the periods presented:



	Three Months Ended				Six Months Ended
Revenue	March 30, 2018		March 31, 2017		March 30, 2018	March 31, 2017
Customer A	12	%	10	%	11%	11%
Customer B	11	%	9	%	9%	6%
Customer C	5	%	11	%	7%	16%



Accounts Receivable	March 30, 2018		September 29, 2017
Customer A	14	%	13	%
Customer D	23	%	14	%

No other customer represented more than 10% of revenue or accounts receivable in the periods presented in the accompanying consolidated financial statements. For the three and six months ended March 30, 2018, our top ten customers represented 58% and 54% of total revenue, respectively, and for the three and six months ended March 31, 2017, our top ten customers represented 56% and 57% of total revenue, respectively.

Subsequent Events Subsequent Events	6 Months Ended
Subsequent Events Subsequent Events	Mar. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	20. SUBSEQUENT EVENTS On April 15, 2018, Zhongxing Telecommunications Equipment Corporation, of Shenzen China, and certain affiliated entities (collectively "ZTE") were added to the U.S. Department of Commerce's Bureau of Industry and Security's List of Denied Persons ("BIS"). As a result, ZTE cannot receive or participate in any way in a transaction involving virtually any commercial items exported from the U.S. until March 13, 2025, and third persons are prohibited from participating in most transactions involving U.S. origin items and ZTE until March 13, 2025. During our most recently completed fiscal year ended September 29, 2017 and six months ended March 30, 2018 sales to ZTE directly or through distribution channels represented less than 2% of our consolidated revenue. As a result of this action by the BIS we determined that certain ZTE-related assets including other assets of $1.9 million, property and equipment of $4.4 million, inventory of $1.3 million and certain of our channel partners held returnable inventory of $1.2 million, designated for future use with ZTE, were impaired. Accordingly, during the three months ended March 30, 2018, we recorded a total impairment charge of $9.1 million, of which $6.6 million was included in operating expenses related to the write-off of the property and equipment and other assets and of which $2.5 million was included in cost of goods sold which related to inventory reserves.

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 30, 2018
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation—We have one reportable segment, semiconductors and modules. The accompanying consolidated financial statements include our accounts and the accounts of our majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Fiscal Period	We have a 52 or 53-week fiscal year ending on the Friday closest to the last day of September. The fiscal years 2018 and 2017 include 52 weeks. To offset the effect of holidays, for fiscal years in which there are 53 weeks, we typically include the extra week arising in our fiscal years in the first quarter.
Use of Estimates	Use of Estimates—The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities during the reporting periods, the reported amounts of revenue and expenses during the reporting periods, and the disclosure of contingent assets and liabilities at the date of the financial statements. On an ongoing basis, we base estimates and assumptions on historical experience, currently available information and various other factors that management believes to be reasonable under the circumstances. Actual results may differ materially from these estimates and assumptions.
Recent Accounting Pronouncements	Recent Accounting Pronouncements—Our Recent Accounting Pronouncements are described in the notes to our September 29, 2017 consolidated financial statements, which were included in our Annual Report on Form 10-K for our fiscal year ended September 29, 2017. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers ("Topic 606"). In March, April, May and December 2016, the FASB issued additional guidance related to Topic 606. The new standard will supersede nearly all existing revenue recognition guidance. Under Topic 606, an entity is required to recognize revenue upon transfer of promised goods or services to customers in an amount that reflects the expected consideration to be received in exchange for those goods or services. Topic 606 defines a five-step process in order to achieve this core principle, which may require the use of judgment and estimates, and also requires expanded qualitative and quantitative disclosures relating to the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including significant judgments and estimates used. The new standard also defines accounting for certain costs related to origination and fulfillment of contracts with customers, including whether such costs should be capitalized. The new standard permits adoption either by using (i) a full retrospective approach for all periods presented in the period of adoption or (ii) a modified retrospective approach where the new standard is applied in the financial statements starting with the year of adoption. Under both approaches, cumulative impact of the adoption is reflected as an adjustment to retained earnings (accumulated equity (deficit)) as of the earliest date presented in accordance with the new standard. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers: Deferral of the Effective Date, which delayed the effective date of the new standard from January 1, 2017 to January 1, 2018. We plan to implement the new guidance on September 29, 2018, the beginning of our next fiscal year, using the modified retrospective approach, applied to those contracts that were not completed as of that date. We are currently analyzing the impact of this new accounting standards update. We do not expect the adoption of Topic 606 to have a material impact on our financial position and results of operations. As we continue our evaluation, we are also assessing any disclosure requirements and preparing to implement changes to accounting policies, business processes and internal controls to support the new standard. In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation ("Topic 718"), which simplifies several aspects of the accounting for employee share-based payment transactions for both public and nonpublic entities. We adopted this ASU as of September 30, 2017. Prior to ASU 2016-09, the accounting for share-based compensation required forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. ASU 2016-09 allows an entity to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. ASU 2016-09 requires an entity that elects to account for forfeitures when they occur to apply the accounting change on a modified retrospective basis as a cumulative-effect adjustment to retained earnings as of the date of adoption. We elected to account for forfeitures when they occur, and recorded a $1.0 million cumulative-effect adjustment to beginning retained earnings as of September 30, 2017. We did not record any adjustments to retained earnings for the tax effect of the adoption of ASU 2016-09 as we are in a full valuation allowance position against our U.S deferred tax asset. ASU 2016-09 requires all excess tax benefits and tax deficiencies to be recorded in the consolidated income statement on a prospective basis when the awards vest or are settled. Due to our full U.S. valuation allowance, ASU 2016-09 had no impact to our tax expense for the three and six months ended March 30, 2018.

Acquisitions (Tables)

6 Months Ended

Mar. 30, 2018

Business Combinations [Abstract]

Summary of Acquisitions

The following table summarizes the total estimated acquisition consideration (in thousands):



Cash consideration paid to AppliedMicro common stockholders	$	287,060
Common stock issued (9,544,125 shares of our common stock at $47.53 per share)	453,632
Equity consideration for vested "in the money" stock options and unvested restricted stock units	2,143
Fair value of the replacement equity awards attributable to pre-acquisition service	9,307
Total consideration paid, excluding cash acquired	$	752,142

Schedule of Aggregate Purchase Price Allocated to Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed

The preliminary allocation of purchase price as of March 30, 2018 is as follows (in thousands):



	Preliminary Allocation as of		Allocation Adjustments			Adjusted Allocation
	September 29, 2017		Allocation Adjustments			March 30, 2018

Current assets	$	7,375	$	(1,088	)	$	6,287
Intangible assets	19,000		—			19,000
Other assets	3,301		(81		)	3,220
Total assets acquired	29,676		(1,169		)	28,507

Current liabilities	2,169		142			2,311
Other liabilities	190		(77		)	113
Total liabilities assumed	2,359		65			2,424
Net assets acquired	27,317		(1,234		)	26,083
Consideration:
Cash paid upon closing, net of cash acquired	33,500		—			33,500
Goodwill	$	6,183	$	1,234		$	7,417

The final purchase price allocation is as follows (in thousands):



	Preliminary Allocation as of		Allocation Adjustments			Adjusted Allocation
	September 29, 2017		Allocation Adjustments			December 29, 2017

Current assets	$	70,434	$	(553	)	$	69,881
Intangible assets	412,848		—			412,848
Assets held for sale	40,944		—			40,944
Other assets	9,800		—			9,800
Total assets acquired	534,026		(553		)	533,473
Liabilities assumed:
Liabilities held for sale	4,444		—			4,444
Other liabilities	17,627		651			18,278
Total liabilities assumed	22,071		651			22,722
Net assets acquired	511,955		(1,204		)	510,751
Consideration:
Cash paid upon closing	230,298		—			230,298
Common stock issued	455,775		—			455,775
Equity instruments issued	9,307		—			9,307
Total consideration	$	695,380	$	—		$	695,380
Goodwill	$	183,425	$	1,204		$	184,629

Components of Acquired Intangible Assets on a Preliminary Basis

The components of the acquired intangible assets were as follows (in thousands):



	Included In Assets Held For Sale		Included in Retained Business		Useful Lives (Years)
Developed technology	$	9,600	$	78,448	7 years
Customer relationships	—		334,400		14 years
Total acquired intangible assets	$	9,600	$	412,848

Summary of Unaudited Supplemental Pro Forma Data

The following is a summary of AppliedMicro revenue and earnings included in our accompanying condensed consolidated statements of operations for the three months ended March 31, 2017 (in thousands):



	Three Months Ended
	March 31, 2017
Revenue	$	36,445
Loss from continuing operations	(30,304		)
Loss from discontinued operations	(16,430		)

This pro forma data is presented for informational purposes only and does not purport to be indicative of our future results of operations.



	Six Months Ended
	March 31, 2017
Revenue	$	394,792
Income from continuing operations	(84,543		)
Loss from discontinued operations	(19,316		)

Discontinued Operations (Tables)

6 Months Ended

Mar. 30, 2018

Discontinued Operations and Disposal Groups [Abstract]

Summary of Operating Results through Dates of Divestiture Related to Divested Businesses

The accompanying consolidated statements of operations includes the following operating results related to these discontinued operations (in thousands):



	Three Months Ended						Six Months Ended
	March 30, 2018			March 31, 2017			March 30, 2018			March 31, 2017
Revenue (1)	$	2		$	259		$	—		$	259
Cost of revenue (1)	(56		)	1,620			(596		)	1,620
Gross profit	58			(1,361		)	596			(1,361		)
Operating expenses:
Research and development (1)	(12		)	8,325			4,698			8,325
Selling, general and administrative (1)	88			6,744			1,515			6,744
Total operating expenses	76			15,069			6,213			15,069
Loss from operations	(18		)	(16,430		)	(5,617		)	(16,430		)
Other income (2)	—			1,875			—			3,750
Gain on sale (2)	—			18,022			—			18,022
(Loss) income before income taxes	(18		)	3,467			(5,617		)	5,342
Income tax provision	—			(669		)	—			—
(Loss) income from discontinued operations	$	(18	)	$	4,136		$	(5,617	)	$	5,342

Cash flow from operating activities	(18		)	(29,072		)	(10,327		)	(29,072		)
Cash flow from investing activities	—			21,770			—			21,770

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=84176398&loc=SL51724579-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Paragraph 3A
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

Short Term Investments (Tables)

6 Months Ended

Mar. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of Available for Sale Investments

The amortized cost, gross unrealized holding gains or losses, and fair value of our investments by major investment type as of March 30, 2018 and September 29, 2017 are summarized in the tables below (in thousands):



	March 30, 2018
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Corporate bonds	$	26,476	$	—	$	(677	)	$	25,799
Commercial paper	1,598		—		(1		)	1,597
Total short term investments	$	28,074	$	—	$	(678	)	$	27,396



	September 29, 2017
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Corporate bonds	$	26,366	$	10	$	(166	)	$	26,210
Commercial paper	57,943		4		(36		)	57,911
Total short term investments	$	84,309	$	14	$	(202	)	$	84,121



	September 29, 2017
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Corporate bonds	$	26,366	$	10	$	(166	)	$	26,210
Commercial paper	57,943		4		(36		)	57,911
Total short term investments	$	84,309	$	14	$	(202	)	$	84,121

Summary of Contractual Maturities of Investments

The contractual maturities of investments were as follows (in thousands):



	March 30, 2018		September 29, 2017
Less than 1 year	$	2,612	$	60,433
Over 1 year	24,784		23,688
Total short term investments	$	27,396	$	84,121

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Fair Value (Tables)

6 Months Ended

Mar. 30, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis consist of the following (in thousands):



	March 30, 2018
	Fair Value		Active Markets for Identical Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Assets
Money market funds	$	179	$	179	$	—	$	—
Commercial paper	65,322		—		65,322		—
Corporate bonds	25,799		—		25,799		—
Total assets measured at fair value	$	91,300	$	179	$	91,121	$	—
Liabilities
Contingent consideration	$	1,130	$	—	$	—	$	1,130
Common stock warrant liability	9,151		—		—		9,151
Total liabilities measured at fair value	$	10,281	$	—	$	—	$	10,281



	September 29, 2017
	Fair Value		Active Markets for Identical Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Assets
Money market funds	$	36	$	36	$	—	$	—
Commercial paper	57,911		—		57,911		—
Corporate bonds	26,210		—		26,210		—
Total assets measured at fair value	$	84,157	$	36	$	84,121	$	—
Liabilities
Contingent consideration	$	1,679	$	—	$	—	$	1,679
Common stock warrant liability	40,775		—		—		40,775
Total liabilities measured at fair value	$	42,454	$	—	$	—	$	42,454

Quantitative information Used in Fair Value Calculation of Level 3 Liabilities

The quantitative information utilized in the fair value calculation of our Level 3 liabilities is as follows:



			Inputs
Liabilities	Valuation Technique	Unobservable Input	March 30, 2018	September 29, 2017
Contingent consideration	Discounted cash flow	Discount rate	9.2%	9.2%
		Probability of achievement	80% - 90%	70% - 100%
		Timing of cash flows	2 months	2 - 8 months

Warrant liability	Black-Scholes model	Volatility	55.6%	44.9%
		Discount rate	2.39%	1.62%
		Expected life	2.7 years	3.2 years
		Exercise price	$14.05	$14.05
		Stock price	$16.60	$44.61
		Dividend rate	—%	—%

Changes in Liabilities with Inputs Classified within Level 3 of Fair Value

The changes in liabilities with inputs classified within Level 3 of the fair value hierarchy consist of the following (in thousands):



	September 29, 2017		Net Realized/Unrealized Gains Included in Earnings			Purchases and Issuances		Sales and Settlements		March 30, 2018
Contingent consideration	$	1,679	$	(549	)	$	—	$	—	$	1,130
Common stock warrant liability	$	40,775	$	(31,624	)	$	—	$	—	$	9,151



	September 30, 2016		Net Realized/Unrealized Losses Included in Earnings		Purchases and Issuances		Sales and Settlements			March 31, 2017
Contingent consideration	$	848	$	33	$	—	$	(400	)	$	481
Common stock warrant liability	$	38,253	$	7,395	$	—	$	—		$	45,648

Changes in Assets with Inputs Classified within Level 3 of Fair Value

The changes in liabilities with inputs classified within Level 3 of the fair value hierarchy consist of the following (in thousands):



	September 29, 2017		Net Realized/Unrealized Gains Included in Earnings			Purchases and Issuances		Sales and Settlements		March 30, 2018
Contingent consideration	$	1,679	$	(549	)	$	—	$	—	$	1,130
Common stock warrant liability	$	40,775	$	(31,624	)	$	—	$	—	$	9,151



	September 30, 2016		Net Realized/Unrealized Losses Included in Earnings		Purchases and Issuances		Sales and Settlements			March 31, 2017
Contingent consideration	$	848	$	33	$	—	$	(400	)	$	481
Common stock warrant liability	$	38,253	$	7,395	$	—	$	—		$	45,648

Inventories (Tables)

6 Months Ended

Mar. 30, 2018

Inventory Disclosure [Abstract]

Components of Inventories

Inventories, net of reserves, consist of the following (in thousands):



	March 30, 2018		September 29, 2017
Raw materials	$	90,652	$	78,999
Work-in-process	13,022		13,962
Finished goods	40,223		43,113
Total inventory, net	$	143,897	$	136,074

Property, Plant and Equipment (Tables)

6 Months Ended

Mar. 30, 2018

Property, Plant and Equipment [Abstract]

Components of Property, Plant and Equipment

Property, plant and equipment consists of the following (in thousands):



	March 30, 2018			September 29, 2017
Construction in process	$	27,207		$	22,195
Machinery and equipment	174,817			160,955
Leasehold improvements	13,232			13,809
Furniture and fixtures	2,411			2,078
Computer equipment and software	17,086			16,539
Capital lease assets	20,764			20,410
Total property and equipment	$	255,517		$	235,986
Less accumulated depreciation and amortization	(116,975		)	(104,967		)
Property and equipment, net	$	138,542		$	131,019

Debt (Tables)

6 Months Ended

Mar. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

All principal amounts outstanding and interest rate information as of March 30, 2018, for the Credit Agreement were as follows (in millions, except rate data):



	Principal Outstanding	LIBOR Rate	Margin	Effective Interest Rate
Term loans	$683.3	1.89%	2.25%	4.14%

Schedule of Remained Outstanding on Term Loans

As of March 30, 2018, the following remained outstanding on the Term Loans (in thousands):



Principal balance	$	683,298
Unamortized discount	(5,230		)
Unamortized deferred financing costs	(11,262		)
Total term loans	$	666,806
Current portion	6,885
Long-term, less current portion	$	659,921

Schedule of Minimum Principal Payments under Term Loans

As of March 30, 2018, the minimum principal payments under the Term Loans in future fiscal years were as follows (in thousands):



2018 (rest of fiscal year)	$	3,442
2019	6,885
2020	6,885
2021	6,885
2022	6,885
Thereafter	652,316
Total	$	683,298

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Capital Lease and Financing Obligations (Tables)

6 Months Ended

Mar. 30, 2018

Leases [Abstract]

Schedule of Future Minimum Lease Payments for Capital Leases

As of March 30, 2018, future minimum payments under capital lease obligations and financing obligations related to the Leases were as follows (in thousands):



Fiscal year ending:	Amount
2018 (rest of fiscal year)	$	950
2019	1,809
2020	1,626
2021	1,483
2022	1,260
Thereafter	20,462
Total minimum capital lease payments	27,590
Less amount representing interest	(15,267		)
Present value of net minimum capital lease payments (1)	$	12,323

(1) Excludes $10.2 million associated with the 144 Chelmsford Lease that has not yet been placed in service.

Intangible Assets (Tables)

6 Months Ended

Mar. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Amortization Expense of Intangible Assets

Amortization expense related to intangible assets is as follows (in thousands):



	Three Months Ended				Six Months Ended
	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
Cost of revenue	$	8,172	$	7,276	$	16,319	$	13,278
Selling, general and administrative	11,753		7,163		22,746		13,630
Total	$	19,925	$	14,439	$	39,065	$	26,908

Summary of Intangible Assets

Intangible assets consist of the following (in thousands):



	March 30, 2018			September 29, 2017
Acquired technology	$	252,025		$	251,655
Customer relationships	558,287			556,648
Trade name	3,400			3,400
Total	$	813,712		$	811,703
Less accumulated amortization	(229,677		)	(190,611		)
Intangible assets — net	$	584,035		$	621,092

Summary of Activity in Intangible Assets and Goodwill

A summary of the activity in intangible assets and goodwill follows (in thousands):



	Intangible Assets
	Total Intangible Assets		Acquired Technology		Customer Relationships		Trade Name		Goodwill
Balance at September 29, 2017	$	811,703	$	251,655	$	556,648	$	3,400	$	313,765
Fair value adjustment	—		—		—		—		2,437
Currency translation adjustment	2,009		370		1,639		—		892
Balance at March 30, 2018	$	813,712	$	252,025	$	558,287	$	3,400	$	317,094

Summary of Estimated Amortization of Intangible Assets in Future Fiscal Years

As of March 30, 2018, our estimated amortization of our intangible assets in future fiscal years was as follows (in thousands):



	2018 Remaining		2019	2020	2021	2022	Thereafter	Total
Amortization expense	$	45,812	90,428	86,978	78,186	65,023	214,208	$	580,635

Earnings (Loss) Per Share (Tables)

6 Months Ended

Mar. 30, 2018

Earnings Per Share [Abstract]

Computation for Basic and Diluted Net Loss Per Share of Common Stock

The following table sets forth the computation for basic and diluted net loss per share of common stock (in thousands, except per share data):



	Three Months Ended						Six Months Ended
	March 30, 2018			March 31, 2017			March 30, 2018			March 31, 2017
Numerator:
Loss from continuing operations	$	(15,466	)	$	(134,267	)	$	(32,436	)	$	(136,438	)
(Loss) income from discontinued operations	(18		)	4,136			(5,617		)	5,342
Net loss	$	(15,484	)	$	(130,131	)	$	(38,053	)	$	(131,096	)
Warrant liability gain	(17,015		)	—			(31,624		)	—
Net loss attributable to common stockholders	$	(32,499	)	$	(130,131	)	$	(69,677	)	$	(131,096	)
Denominator:
Weighted average common shares outstanding-basic	64,549			60,813			64,437			57,276
Dilutive effect of warrants	583			—			683			—
Weighted average common shares outstanding-diluted	65,132			$	60,813		$	65,120		$	57,276
(Loss) earnings per share-basic:
Continuing operations	$	(0.24	)	$	(2.21	)	$	(0.50	)	$	(2.38	)
Discontinued operations	0.00			0.07			(0.09		)	0.09
Net loss to common stock holders per share-basic	$	(0.24	)	$	(2.14	)	$	(0.59	)	$	(2.29	)
(Loss) earnings per share-diluted:
Continuing operations	$	(0.50	)	$	(2.21	)	$	(0.98	)	$	(2.38	)
Discontinued operations	0.00			0.07			(0.09		)	0.09
Net loss to common stock holders per share-diluted	$	(0.50	)	$	(2.14	)	$	(1.07	)	$	(2.29	)

Restructurings (Tables)

6 Months Ended

Mar. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring and Related Activities Disclosure [Text Block]

RESTRUCTURINGS



	Three Months Ended				Six Months Ended
	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
Employee related expenses	$	221	$	469	$	2,792	$	1,757
Facility related expenses	1,318		—		3,408		—
Total restructuring charges	$	1,539	$	469	$	6,200	$	1,757

The following is a summary of the costs incurred for the six months ended March 30, 2018 and the remaining balances included in accrued expenses at March 30, 2018 (in thousands):



Balance as of September 29, 2017	$	627
Current period expense	6,200
Charges paid/settled, net	(4,777		)
Balance as of March 30, 2018	$	2,050

Restructuring and Related Costs [Table Text Block]

The following is a summary of the restructuring charges incurred for the three and six months ended March 30, 2018 under these restructuring plans:



	Three Months Ended				Six Months Ended
	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
Employee related expenses	$	221	$	469	$	2,792	$	1,757
Facility related expenses	1,318		—		3,408		—
Total restructuring charges	$	1,539	$	469	$	6,200	$	1,757

Summary of Costs Incurred and Remaining Balances Included in Accrued Expenses

The following is a summary of the costs incurred for the six months ended March 30, 2018 and the remaining balances included in accrued expenses at March 30, 2018 (in thousands):



Balance as of September 29, 2017	$	627
Current period expense	6,200
Charges paid/settled, net	(4,777		)
Balance as of March 30, 2018	$	2,050

Share-Based Compensation (Tables)

6 Months Ended

Mar. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Nonemployees



	Three Months Ended				Six Months Ended
	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
Cost of revenue	$	917	$	679	$	1,862	$	1,399
Research and development	2,976		2,727		6,637		4,671
Selling, general and administrative	1,457		6,144		6,843		11,661
Total share-based compensation expense	$	5,350	$	9,550	$	15,342	$	17,731

Summary of Restricted Stock, Restricted Stock Unit and Performance-based Restricted Stock Unit Activity

A summary of restricted stock, restricted stock unit and performance-based restricted stock unit activity for the six months ended March 30, 2018, is as follows (in thousands, except per share data):



	Number of RSUs		Weighted- Average Grate Date Fair Value		Aggregate Intrinsic Value (in thousands)
Balance at September 29, 2017	1,907		$	39.20	$	72,165
Granted	901		26.07
Vested and released	(500	)	37.10
Forfeited, canceled or expired	(132	)	32.97
Balance at March 30, 2018	2,176		$	34.63	$	36,015

Supplemental Cash Flow Information (Tables)

6 Months Ended

Mar. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Supplemental Cash Flow Information Regarding Non-cash Investing and Financing Activities

The following is supplemental cash flow information regarding non-cash investing and financing activities (in thousands):



	Six Months Ended
	March 30, 2018		March 31, 2017
Cash paid for interest	$	14,094	$	16,668
Cash paid (refunded) for income taxes	$	4,065	$	(720	)

Geographic and Significant Customer Information (Tables)

6 Months Ended

Mar. 30, 2018

Segment Reporting [Abstract]

Summary of Different Geographic Regions

Information about our operations in different geographic regions, based upon customer locations, is presented below (in thousands):



	Three Months Ended				Six Months Ended
Revenue by Geographic Region	March 30, 2018		March 31, 2017		March 30, 2018		March 31, 2017
United States	$	74,323	$	66,223	$	129,679	$	110,184
China	38,364		56,534		76,052		116,835
Asia Pacific, excluding China (1)	23,347		48,613		46,232		85,541
Other Countries (2)	14,380		14,714		29,375		25,276
Total	$	150,414	$	186,084	$	281,338	$	337,836


(1)	Asia Pacific represents Taiwan, Japan, Singapore, India, Thailand, South Korea, Australia, Malaysia, New Zealand, the Philippines and Vietnam.


(2)	No international country or region represented greater than 10% of the total revenue as of the dates presented, other than China and the Asia Pacific region as presented above.



	As of
Long-Lived Assets by Geographic Region	March 30, 2018		September 29, 2017
United States	$	102,064	$	101,044
Asia Pacific (1)	33,001		24,945
Other Countries (2)	3,477		5,030
Total	$	138,542	$	131,019


(1)	Asia Pacific represents Taiwan, India, Japan, Thailand, South Korea, Australia, Malaysia, New Zealand, the Philippines, Vietnam and China.


(2)	No international country or region represented greater than 10% of the total net long-lived assets as of the dates presented, other than the Asia Pacific region as presented above.

Summary of Customer Concentrations as Percentage of Revenue and Accounts Receivable

The following is a summary of customer concentrations as a percentage of revenue and accounts receivable as of and for the periods presented:



	Three Months Ended				Six Months Ended
Revenue	March 30, 2018		March 31, 2017		March 30, 2018	March 31, 2017
Customer A	12	%	10	%	11%	11%
Customer B	11	%	9	%	9%	6%
Customer C	5	%	11	%	7%	16%



Accounts Receivable	March 30, 2018		September 29, 2017
Customer A	14	%	13	%
Customer D	23	%	14	%

Summary of Significant Accounting Policies (Details) $ in Millions	6 Months Ended
	Mar. 30, 2018 USD ($) segment
Accounting Policies [Abstract]
Number of reportable operating segment \| segment	1
Accounting Standards Update 2016-09 [Member] \| Accumulated Deficit [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets \| $	$ 1.0

Acquisitions - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Aug. 09, 2017	Jan. 26, 2017	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Equity instruments issued					$ 0	$ 465,082
Applied Micro Circuits Corporation
Business Acquisition [Line Items]
Total consideration paid		$ 695,400			695,380
Cash consideration paid, excluding consideration paid for vested equity awards		287,100
Cash acquired from acquisition		56,800
Fair value of equity issued		465,100
Equity instruments issued		453,632
Transaction costs			$ 0	$ 8,300	$ 0	$ 11,800
Weighted-average life of identified intangible assets acquired					12 years 8 months 12 days
Cash consideration paid		287,060
Applied Micro Circuits Corporation \| Stock Options And Restricted Stock [Member]
Business Acquisition [Line Items]
Fair value of equity instruments transferred		14,500
Equity instruments issued		$ 9,300			$ 9,307
Picometrix
Business Acquisition [Line Items]
Total consideration paid	$ 29,500
Transaction costs					0
Cash consideration paid	33,500				$ 33,500
Indemnification assets	$ 4,000

Acquisitions Acquisitions - Acquisition Consideration Transferred (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 26, 2017	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Common stock issued (9,544,125 shares of our common stock at $47.53 per share)				$ 0	$ 465,082
Applied Micro Circuits Corporation
Business Acquisition [Line Items]
Cash consideration paid to AppliedMicro common stockholders	$ 287,060
Common stock issued (9,544,125 shares of our common stock at $47.53 per share)	453,632
Equity consideration for vested in the money stock options and unvested restricted stock units	2,143
Fair value of the replacement equity awards attributable to pre-acquisition service	9,307
Total consideration paid, excluding cash acquired	$ 752,142
Number of shares issued for acquisition (in shares)	9,544,125
Price per share issued for acquisition (in dollars per share)	$ 47.53
Transaction costs		$ 0	$ 8,300	$ 0	$ 11,800

Acquisitions - Schedule of Aggregate Purchase Price Allocated to Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			6 Months Ended		12 Months Ended
	Aug. 09, 2017	Jan. 26, 2017	Mar. 30, 2018	Mar. 31, 2017	Sep. 29, 2017
Consideration:
Cash paid upon closing, net of cash acquired			$ 0	$ 229,423
Equity instruments issued			0	$ 465,082
Goodwill			317,094		$ 313,765
Applied Micro Circuits Corporation
Business Acquisition [Line Items]
Current assets			69,881
Intangible assets			412,848
Assets held for sale			40,944
Other assets			9,800
Total assets acquired			533,473
Liabilities assumed:
Liabilities held for sale			4,444
Other liabilities			18,278
Total liabilities assumed			22,722
Net assets acquired			510,751
Consideration:
Cash paid upon closing, net of cash acquired			230,298
Equity instruments issued		$ 453,632
Total consideration		695,400	695,380
Cash paid upon closing, net of cash acquired		287,060
Goodwill			184,629
Applied Micro Circuits Corporation \| Stock Options And Restricted Stock [Member]
Consideration:
Equity instruments issued		$ 9,300	9,307
Applied Micro Circuits Corporation \| Common Stock
Consideration:
Equity instruments issued			455,775
Applied Micro Circuits Corporation \| Preliminary Allocation [Member]
Business Acquisition [Line Items]
Current assets					70,434
Intangible assets					412,848
Assets held for sale					40,944
Other assets					9,800
Total assets acquired					534,026
Liabilities assumed:
Liabilities held for sale					4,444
Other liabilities					17,627
Total liabilities assumed					22,071
Net assets acquired					511,955
Consideration:
Cash paid upon closing, net of cash acquired					230,298
Total consideration					695,380
Goodwill					183,425
Applied Micro Circuits Corporation \| Preliminary Allocation [Member] \| Stock Options And Restricted Stock [Member]
Consideration:
Equity instruments issued					9,307
Applied Micro Circuits Corporation \| Preliminary Allocation [Member] \| Common Stock
Consideration:
Equity instruments issued					455,775
Applied Micro Circuits Corporation \| Allocation Adjustments [Member]
Business Acquisition [Line Items]
Current assets			(553)
Intangible assets			0
Assets held for sale			0
Other assets			0
Total assets acquired			(553)
Liabilities assumed:
Liabilities held for sale			0
Other liabilities			651
Total liabilities assumed			651
Net assets acquired			(1,204)
Consideration:
Cash paid upon closing, net of cash acquired			0
Total consideration			0
Goodwill			1,204
Applied Micro Circuits Corporation \| Allocation Adjustments [Member] \| Stock Options And Restricted Stock [Member]
Consideration:
Equity instruments issued			0
Applied Micro Circuits Corporation \| Allocation Adjustments [Member] \| Common Stock
Consideration:
Equity instruments issued			0
Picometrix
Business Acquisition [Line Items]
Current assets			6,287
Intangible assets			19,000
Other assets			3,220
Total assets acquired			28,507
Liabilities assumed:
Current liabilities			2,311
Other liabilities			113
Total liabilities assumed			2,424
Net assets acquired			26,083
Consideration:
Total consideration	$ 29,500
Cash paid upon closing, net of cash acquired	$ 33,500		33,500
Goodwill			7,417
Picometrix \| Preliminary Allocation [Member]
Business Acquisition [Line Items]
Current assets					7,375
Intangible assets					19,000
Other assets					3,301
Total assets acquired					29,676
Liabilities assumed:
Current liabilities					2,169
Other liabilities					190
Total liabilities assumed					2,359
Net assets acquired					27,317
Consideration:
Cash paid upon closing, net of cash acquired					33,500
Goodwill					$ 6,183
Picometrix \| Allocation Adjustments [Member]
Business Acquisition [Line Items]
Current assets			(1,088)
Intangible assets			0
Other assets			(81)
Total assets acquired			(1,169)
Liabilities assumed:
Current liabilities			142
Other liabilities			(77)
Total liabilities assumed			65
Net assets acquired			(1,234)
Consideration:
Cash paid upon closing, net of cash acquired			0
Goodwill			$ 1,234

Acquisitions - Components of Acquired Intangible Assets on a Preliminary Basis (Details) - Applied Micro Circuits Corporation $ in Thousands	6 Months Ended
	Mar. 30, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	$ 412,848
Included In Assets Held For Sale
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	9,600
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	$ 78,448
Useful Lives (Years)	7 years
Developed technology \| Included In Assets Held For Sale
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	$ 9,600
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	$ 334,400
Useful Lives (Years)	14 years
Customer relationships \| Included In Assets Held For Sale
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	$ 0

Acquisitions - Summary of Revenue and Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Loss from discontinued operations	$ (18)	$ 4,136	$ (5,617)	$ 5,342
Applied Micro Circuits Corporation
Business Acquisition [Line Items]
Revenue		36,445
Loss from continuing operations		(30,304)
Loss from discontinued operations		$ (16,430)

- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

Acquisitions - Summary of Unaudited Supplemental Pro Forma Data (Details) - Applied Micro Circuits Corporation $ in Thousands	6 Months Ended
	Mar. 31, 2017 USD ($)
Business Acquisition [Line Items]
Revenue	$ 394,792
Income from continuing operations	(84,543)
Loss from discontinued operations	$ (19,316)

Discontinued Operations - Additional information (Details) - USD ($)		3 Months Ended		6 Months Ended
	Aug. 17, 2015	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Income		$ 0		$ 0
Consulting Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non design advisory services period	2 years
Other Income		$ 0	$ 1,875,000	$ 0	$ 3,750,000
Consulting Agreement \| Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration on sale of business	$ 15,000,000
Automotive Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group Including Discontinued Operation Working Capital And Other Adjustments	$ 18,000,000
Equity Securities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest ownership percentage		20.00%		20.00%
Ampere \| Equity Securities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Investment cost basis		$ 36,500,000		$ 36,500,000
Noncontrolling interest ownership percentage		20.00%		20.00%

Discontinued Operations - Summary of Operating Results through Dates of Divestiture Related to Divested Businesses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Revenue (1)	$ 2	$ 259	$ 0	$ 259
Cost of revenue (1)	(56)	1,620	(596)	1,620
Gross profit	58	(1,361)	596	(1,361)
Operating expenses:
Research and development (1)	(12)	8,325	4,698	8,325
Selling, general and administrative (1)	88	6,744	1,515	6,744
Total operating expenses	76	15,069	6,213	15,069
Loss from operations	(18)	(16,430)	(5,617)	(16,430)
Other income (2)	0		0
Gain on sale (2)	0	18,022	0	18,022
(Loss) income before income taxes	(18)	3,467	(5,617)	5,342
Income tax provision	0	(669)	0	0
(Loss) income from discontinued operations	(18)	4,136	(5,617)	5,342
Cash flow from operating activities	(18)	(29,072)	(10,327)	(29,072)
Cash flow from investing activities	$ 0	21,770	$ 0	21,770
Cash flow from financing activities		$ 0		$ 0

Discontinued Operations Discontinued Operations - Schedule of Prior Period Adjustment Restatement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Disposal Group, Including Discontinued Operation, Depreciation and Amortization		$ 0		$ 0
Cash flow from operating activities	$ (18)	(29,072)	$ (10,327)	(29,072)
Cash flow from investing activities	$ 0	21,770	$ 0	21,770
Cash flow from financing activities		0		0
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Disposal Group, Including Discontinued Operation, Depreciation and Amortization		2,535		2,535
Cash flow from operating activities		12,487		12,487
Cash flow from investing activities		(663)		(663)
Cash flow from financing activities		$ (32,201)		$ (32,201)

Investments - Summary of Available for Sale Investments (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 28,074	$ 84,309
Gross Unrealized Holding Gains	0	14
Gross Unrealized Holding Losses	(678)	(202)
Aggregate Fair Value	27,396	84,121
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,476	26,366
Gross Unrealized Holding Gains	0	10
Gross Unrealized Holding Losses	(677)	(166)
Aggregate Fair Value	25,799	26,210
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,598	57,943
Gross Unrealized Holding Gains	0	4
Gross Unrealized Holding Losses	(1)	(36)
Aggregate Fair Value	$ 1,597	$ 57,911

Investments - Change in Available for Sale Investments (Details) $ in Thousands	Mar. 30, 2018 USD ($)
Movement in Available-for-sale Securities [Roll Forward]
Balance at beginning of period	$ 84,121
Balance at end of period	27,396
Corporate Debt Securities [Member]
Movement in Available-for-sale Securities [Roll Forward]
Balance at beginning of period	26,210
Balance at end of period	$ 25,799

Investments - Summary of Contractual Maturities of Investments (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Investments, Debt and Equity Securities [Abstract]
Less than 1 year	$ 2,612	$ 60,433
Over 1 year	24,784	23,688
Total short term investments	$ 27,396	$ 84,121

Investments - Other Investments (Details) $ in Thousands	3 Months Ended	6 Months Ended
Investments - Other Investments (Details) $ in Thousands	Mar. 30, 2018 USD ($) investment	Mar. 30, 2018 USD ($) investment	Mar. 31, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of equity investments \| investment	2	2
Income (Loss) from Equity Method Investments		$ (4,085)	$ 0
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Noncontrolling interest ownership percentage	20.00%	20.00%
Equity Securities \| Ampere
Schedule of Available-for-sale Securities [Line Items]
Investment cost basis	$ 36,500	$ 36,500
Noncontrolling interest ownership percentage	20.00%	20.00%
Equity Method Investment, Aggregate Cost	$ 36,500	$ 36,500
Income (Loss) from Equity Method Investments	4,100	4,100
Preferred Stock \| Privately Held Manufacturing Company
Schedule of Available-for-sale Securities [Line Items]
Investment cost basis	$ 5,000	$ 5,000

Fair Value Fair Value - Quantitative Information Used in Fair Value Calculation of Level 3 Liabilities (Details) - USD ($)
$ / shares in Units, $ in Thousands

6 Months Ended

12 Months Ended

Dec. 28, 2016

Mar. 30, 2018

Sep. 29, 2017

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Quantitative information Used in Fair Value Calculation of Level 3 Liabilities

The quantitative information utilized in the fair value calculation of our Level 3 liabilities is as follows:



			Inputs
Liabilities	Valuation Technique	Unobservable Input	March 30, 2018	September 29, 2017
Contingent consideration	Discounted cash flow	Discount rate	9.2%	9.2%
		Probability of achievement	80% - 90%	70% - 100%
		Timing of cash flows	2 months	2 - 8 months

Warrant liability	Black-Scholes model	Volatility	55.6%	44.9%
		Discount rate	2.39%	1.62%
		Expected life	2.7 years	3.2 years
		Exercise price	$14.05	$14.05
		Stock price	$16.60	$44.61
		Dividend rate	—%	—%

Discount rate

8.60%

Fair Value, Measurements, Recurring [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Total liabilities measured at fair value

$ 10,281

$ 42,454

Fair Value, Measurements, Recurring [Member] | Unobservable Inputs (Level 3) [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Total liabilities measured at fair value

10,281

42,454

Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Total liabilities measured at fair value

1,130

1,679

Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] | Unobservable Inputs (Level 3) [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Total liabilities measured at fair value

$ 1,130

$ 1,679

Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] | Income Approach Valuation Technique [Member] | Unobservable Inputs (Level 3) [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Discount rate

9.20%

Expected life

2 months

Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] | Minimum | Income Approach Valuation Technique [Member] | Unobservable Inputs (Level 3) [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Inputs, Probability of Occurrence

80.00%

70.00%

Expected life

2 months

Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member] | Maximum | Income Approach Valuation Technique [Member] | Unobservable Inputs (Level 3) [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Inputs, Probability of Occurrence

90.00%

100.00%

Expected life

8 months

Fair Value, Measurements, Recurring [Member] | Common Stock Warrant Liability [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Total liabilities measured at fair value

$ 9,151

$ 40,775

Fair Value, Measurements, Recurring [Member] | Common Stock Warrant Liability [Member] | Unobservable Inputs (Level 3) [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Total liabilities measured at fair value

$ 9,151

$ 40,775

Fair Value, Measurements, Recurring [Member] | Common Stock Warrant Liability [Member] | Market Approach Valuation Technique [Member] | Unobservable Inputs (Level 3) [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Discount rate

2.39%

1.62%

Expected life

2 years 8 months 23 days

3 years 2 months 12 days

Expected volatility rate

55.60%

44.90%

Exercise price (in usd per share)

$ 14.05

Share Price

$ 16.60

$ 44.61

Fair Value Assumptions, Expected Dividend Rate

0.00%

Fair Value - Changes in Assets and Liabilities with Inputs Classified within Level 3 of Fair Value (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1,679	$ 848
Net Realized/Unrealized Gains Included in Earnings	(549)	33
Purchases and Issuances	0	0
Sales and Settlements	0	(400)
Balance at end of period	1,130	481
Common Stock Warrant Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	40,775	38,253
Net Realized/Unrealized Gains Included in Earnings	(31,624)	7,395
Purchases and Issuances	0	0
Sales and Settlements	0	0
Balance at end of period	$ 9,151	$ 45,648

Inventories (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 90,652	$ 78,999
Work-in-process	13,022	13,962
Finished goods	40,223	43,113
Total inventory, net	$ 143,897	$ 136,074

Property Plant and Equipment - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 255,517	$ 235,986
Less accumulated depreciation and amortization	(116,975)	(104,967)
Property and equipment, net	138,542	131,019
Construction in process
Property, Plant and Equipment [Line Items]
Total property and equipment	27,207	22,195
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	174,817	160,955
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	13,232	13,809
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	2,411	2,078
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	17,086	16,539
Capital lease assets
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 20,764	$ 20,410

Property Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 7.6	$ 7.2	$ 15.4	$ 13.1

Debt - Additional Information (Details)	6 Months Ended
Debt - Additional Information (Details)	Mar. 30, 2018 USD ($)
Debt Instrument [Line Items]
Principle amount	$ 700,000,000
Unamortized deferred financing costs	11,800,000
Term Loans
Debt Instrument [Line Items]
Amount drawn	$ 666,806,000
Effective interest rate	4.14%
Unamortized deferred financing costs	$ 11,262,000
Principal balance	683,298,000
Estimated fair value of Term Loans	692,700,000
Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized deferred financing costs	500,000
Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, remaining borrowing capacity	$ 160,000,000.0
Federal Funds Effective Swap Rate [Member] \| Term Loans
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
One Month London Interbank Offered Rate (LIBOR) [Member] \| Term Loans
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
LIBOR Rate \| Term Loans
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Minimum \| LIBOR Rate \| Term Loans
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%

Debt Debt - Schedule of Long-term Debt Instruments (Details) - Term Loans $ in Thousands	6 Months Ended
	Mar. 30, 2018 USD ($)
Debt Instrument [Line Items]
Principal balance	$ 683,298
Effective interest rate	4.14%
LIBOR Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Margin
Debt Instrument [Line Items]
Basis spread on variable rate	1.89%

Debt - Schedule of Remained Outstanding on Term Loans (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Debt Instrument [Line Items]
Unamortized deferred financing costs	$ (11,800)
Current portion	6,885	$ 6,885
Long-term, less current portion	659,921	$ 661,471
Term Loans
Debt Instrument [Line Items]
Principal balance	683,298
Unamortized discount	(5,230)
Unamortized deferred financing costs	(11,262)
Total term loans	666,806
Current portion	6,885
Long-term, less current portion	$ 659,921

Debt - Schedule of Minimum Principal Payments under Term Loans (Details) - Term Loans $ in Thousands	Mar. 30, 2018 USD ($)
Debt Instrument [Line Items]
2018 (rest of fiscal year)	$ 3,442
2019	6,885
2020	6,885
2021	6,885
2022	6,885
Thereafter	652,316
Total	$ 683,298

Capital Lease and Financing Obligations Narrative (Details) - USD ($) $ in Thousands		6 Months Ended
	Dec. 28, 2016	Mar. 30, 2018	Mar. 31, 2017
Capital Leased Assets [Line Items]
Proceeds from corporate facility financing obligation		$ 1,081	$ 4,250
Discount rate	8.60%
FiBest and Bin Optics
Capital Leased Assets [Line Items]
Financing obligations associated with leases		1,900
100 Chelmsford Street
Capital Leased Assets [Line Items]
Lease term	20 years
Proceeds from corporate facility financing obligation	$ 4,200
Amount of consideration received	4,000
Financing obligations associated with leases	$ 8,200
144 Chelmsford Street Lease
Capital Leased Assets [Line Items]
Lease term	20 years
Capital Lease Obligations Incurred		10,200
Corporate Facility Leases
Capital Leased Assets [Line Items]
Lease term	20 years
Financing obligations associated with leases		$ 22,400
121 Hale Street
Capital Leased Assets [Line Items]
Lease term	14 years
Financing obligations associated with leases	$ 4,000

Capital Lease and Financing Obligations FutureMinimumLeasePayments (Details) $ in Thousands	Mar. 30, 2018 USD ($)
Leases [Abstract]
2018 (rest of fiscal year)	$ 950
2019	1,809
2020	1,626
2021	1,483
2022	1,260
Thereafter	20,462
Total minimum capital lease payments	27,590
Less amount representing interest	(15,267)
Present value of net minimum capital lease payments	$ 12,323

Intangible Assets - Summary of Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Total	$ 19,925	$ 14,439	$ 39,065	$ 26,908
Cost of Revenue
Finite-Lived Intangible Assets [Line Items]
Total	8,172	7,276	16,319	13,278
Selling, General and Administrative
Finite-Lived Intangible Assets [Line Items]
Total	$ 11,753	$ 7,163	$ 22,746	$ 13,630

Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Finite-Lived Intangible Assets [Line Items]
Trade name	$ 3,400	$ 3,400
Total	813,712	811,703
Less accumulated amortization	(229,677)	(190,611)
Intangible assets — net	584,035	621,092
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	252,025	251,655
Less accumulated amortization	(123,000)	(106,800)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	558,287	556,648
Less accumulated amortization	$ (106,700)	$ (83,900)

Intangible Assets - Summary of Activity in Intangible Assets and Goodwill (Details) $ in Thousands	6 Months Ended
	Mar. 30, 2018 USD ($)
Indefinite-lived Intangible Assets [Roll Forward]
Goodwill, Purchase Accounting Adjustments	$ 2,437
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	313,765
Currency translation adjustment	892
Balance at end of period	317,094
Goodwill and Intangible Assets [Roll Forward]
Balance at beginning of period	811,703
Goodwill and Intangible Assets, Purchase Accounting Adjustments	0
Currency translation adjustment	2,009
Balance at end of period	813,712
Trade Name [Member]
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments	0
Indefinite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	3,400
Currency translation adjustment	0
Balance at end of period	3,400
Acquired Technology [Member]
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	251,655
Fair value adjustment	0
Currency translation adjustment	370
Balance at end of period	252,025
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	556,648
Fair value adjustment	0
Currency translation adjustment	1,639
Balance at end of period	$ 558,287

Intangible Assets - Summary of Estimated Amortization of Intangible Assets (Details) $ in Thousands	Mar. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2018 Remaining	$ 45,812
2019	90,428
2020	86,978
2021	78,186
2022	65,023
Thereafter	214,208
Total	$ 580,635

Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ 229,677	$ 190,611
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	123,000	106,800
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ 106,700	$ 83,900

Stockholders' Equity - Additional Information (Details) - $ / shares	Mar. 30, 2018	Sep. 29, 2017	Mar. 31, 2012
Equity [Abstract]
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Class of Warrant or Right [Line Items]
Common stock warrants per share (in usd per share)			$ 14.05
Common Stock
Class of Warrant or Right [Line Items]
Common stock warrants (in shares)			1,281,358

Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Numerator:
Loss from continuing operations	$ (15,466)	$ (134,267)	$ (32,436)	$ (136,438)
(Loss) income from discontinued operations	(18)	4,136	(5,617)	5,342
Net loss	(15,484)	(130,131)	(38,053)	(131,096)
Warrant liability gain	(17,015)	0	(31,624)	0
Net loss attributable to common stockholders	$ (32,499)	$ (130,131)	$ (69,677)	$ (131,096)
Denominator:
Weighted average common shares outstanding-basic	64,549,000	60,813,000	64,437,000	57,276,000
Dilutive effect of options and warrants (in shares)	582,889	0	683,198	0
Weighted average common shares outstanding-diluted	65,132,000	60,813,000	65,120,000	57,276,000
(Loss) earnings per share-basic:
Continuing operations (in usd per share)	$ (0.24)	$ (2.21)	$ (0.50)	$ (2.38)
Discontinued operations (in usd per share)	0.00	0.07	(0.09)	0.09
Loss per share - basic	(0.24)	(2.14)	(0.59)	(2.29)
(Loss) earnings per share-diluted:
Continuing operations (in usd per share)	(0.50)	(2.21)	(0.98)	(2.38)
Discontinued operations (in usd per share)	0.00	0.07	(0.09)	0.09
Loss per share - diluted	$ (0.50)	$ (2.14)	$ (1.07)	$ (2.29)
Number of antidilutive shares of common stock excluded from the calculation (in shares)	477,212	2,030,744	488,521	1,953,035

Restructurings Restructurings - Restructuring and Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 1,539	$ 469	$ 6,200	$ 1,757
Employee related costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	221	469	2,792	1,757
Facility related expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 1,318	$ 0	$ 3,408	$ 0

Restructurings - Summary of Costs Incurred and Remaining Balances Included in Accrued Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Restructuring Reserve [Roll Forward]
Balance as of beginning of period			$ 627
Current period expense	$ 1,539	$ 469	6,200	$ 1,757
Charges paid/settled, net			(4,777)
Balance as of end of period	$ 2,050		$ 2,050

Restructurings - Additional Information (Details) $ in Millions	Mar. 30, 2018 USD ($)
Minimum
Restructuring Cost and Reserve [Line Items]
Additional restructuring costs expects during the remainder of 2016	$ 0.1
Maximum
Restructuring Cost and Reserve [Line Items]
Additional restructuring costs expects during the remainder of 2016	$ 0.5

Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Nov. 30, 2017	Nov. 24, 2017	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost expected to be recognized			$ 69.1		$ 69.1
Compensation cost expected to be recognized, weighted-average period					2 years 7 months 28 days
Stock options outstanding (in shares)			1,500,000		1,500,000
Weighted-average exercise price per share (in usd per share)			$ 33.10		$ 33.10
Weighted average remaining contractual term options outstanding					5 years 2 months 31 days
Aggregate intrinsic value stock options outstanding			$ 1.2		$ 1.2
Options exercisable (in shares)			400,000		400,000
Weighted average exercise price of options exercisable (in dollars per share)			$ 24.23		$ 24.23
Weighted-average remaining contractual term					3 years 9 months 18 days
Options exercisable intrinsic value			$ 1.2		$ 1.2
Total intrinsic value of options exercised			$ 0.2	$ 0.3	0.7	$ 1.8
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	10,924
Non Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	69,076
Incentive And Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost expected to be recognized, weighted-average period	4 years 6 months
Aggregate grant date fair value	$ 1.4
Expected volatility rate	45.70%
Risk free interest rate	2.21%
Exercise price	$ 36.61
Expected term	6 years 6 months
Restricted Stock, Restricted Stock Units and Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock units vesting					$ 10.4	$ 10.0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options granted					7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options granted					10 years
Options Granted in November 2017 \| Non Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost expected to be recognized, weighted-average period					3 years
Options granted (in shares)		325,000
Aggregate grant date fair value		$ 5.0
Term of vesting of options		7 years
Expected volatility rate					45.80%
Risk free interest rate					2.26%
Exercise price			$ 36.58		$ 36.58
Expected term					7 years
Target price for common stock for recognition of unamortized compensation cost (in dollars per share)					$ 98.99
Measurement period for target price					30 days
2012 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants			14,000,000		14,000,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants			3,400,000		3,400,000
Unrecognized compensation cost			$ 0.4		$ 0.4

Share-Based Compensation - Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Non-Employees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	$ 5,350	$ 9,550	$ 15,342	$ 17,731
Cost of Revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	917	679	1,862	1,399
Research and Development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	2,976	2,727	6,637	4,671
Selling, General and Administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	$ 1,457	$ 6,144	$ 6,843	$ 11,661

Share-Based Compensation - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Restricted Stock Unit Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Mar. 30, 2018	Sep. 29, 2017
Number of RSUs
Balance at beginning of period (in shares)	1,907
Granted (in shares)	901
Vested and released (in shares)	(500)
Forfeited, canceled or expired (in shares)	(132)
Balance at end of period (in shares)	2,176
Weighted- Average Grate Date Fair Value
Balance at beginning of period (in usd per share)	$ 39.20
Granted (in usd per share)	26.07
Vested and released (in usd per share)	37.10
Forfeited, canceled or expired (in usd per share)	32.97
Balance at end of period (in usd per share)	$ 34.63
Aggregate Intrinsic Value (in thousands)	$ 36,015	$ 72,165

Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended	12 Months Ended
Income Taxes (Details) - USD ($)	Mar. 30, 2018	Sep. 30, 2016	Mar. 30, 2018	Sep. 28, 2018	Sep. 29, 2017
Investments, Owned, Federal Income Tax Note [Line Items]
Unrecognized tax benefit	$ 300,000		$ 300,000		$ 1,700,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			1,400,000
Penalties and interest accrued	0		0		$ 0
Penalties and interest expense	$ 0	$ 0
Tax cuts and jobs act of 2017 re-measurement of U.S. deferred taxes			3,700,000
Tax Year 2018
Investments, Owned, Federal Income Tax Note [Line Items]
Tax effect of repatriation of foreign earnings			$ 1,000,000
Scenario, Forecast
Investments, Owned, Federal Income Tax Note [Line Items]
Effective tax rate				24.50%

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Cadence \| Public Company
Related Party Transaction [Line Items]
Other expense - related party	$ 4.1	$ 1.5

Supplemental Cash Flow Information - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 30, 2018	Mar. 30, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Equity Method Investments		$ (4,085)	$ 0
Unpaid amounts related to purchase of assets		1,500	1,100
Common stock issued (9,544,125 shares of our common stock at $47.53 per share)		0	$ 465,082
Compute Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration on sale of business	$ 36,500	36,500
Ampere \| Equity Securities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Investment cost basis	36,500	36,500
Income (Loss) from Equity Method Investments	$ 4,100	$ 4,100

Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information Regarding Non-cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Noncash or Part Noncash Acquisitions [Line Items]
Common stock issued (9,544,125 shares of our common stock at $47.53 per share)	$ 0	$ 465,082
Cash paid for interest	14,094	16,668
Cash paid (refunded) for income taxes	4,065	$ (720)
Capitalized construction costs for capital leases	9,200
Developer Funded [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Capitalized construction costs for capital leases	$ 7,100

Geographic and Significant Customer Information - Additional Information (Details)	3 Months Ended		6 Months Ended
	Mar. 30, 2018 customer	Mar. 31, 2017 customer	Mar. 30, 2018 segment customer	Mar. 31, 2017 customer
Segment Reporting [Abstract]
Number of reportable operating segment \| segment			1
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of major customers \| customer	10	10	10	10
Revenue \| Customer Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	58.00%	56.00%	54.00%	57.00%

Geographic and Significant Customer Information - Summary of Different Geographic Regions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017	Sep. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue by Geographic Region	$ 150,414	$ 186,084	$ 281,338	$ 337,836
Long-Lived Assets by Geographic Region	138,542		138,542		$ 131,019
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue by Geographic Region	74,323	66,223	129,679	110,184
Long-Lived Assets by Geographic Region	102,064		102,064		101,044
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue by Geographic Region	38,364	56,534	76,052	116,835
Asia Pacific, excluding China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue by Geographic Region	23,347	48,613	46,232	85,541
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets by Geographic Region	33,001		33,001		24,945
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue by Geographic Region	14,380	$ 14,714	29,375	$ 25,276
Long-Lived Assets by Geographic Region	$ 3,477		$ 3,477		$ 5,030

Geographic and Significant Customer Information - Summary of Customer Concentrations as Percentage of Revenue and Accounts Receivable (Details) - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Revenue
Revenue from External Customer [Line Items]
Concentration risk, percentage	58.00%	56.00%	54.00%	57.00%
Revenue \| Customer A
Revenue from External Customer [Line Items]
Concentration risk, percentage	12.00%	10.00%	11.00%	11.00%
Revenue \| Customer B
Revenue from External Customer [Line Items]
Concentration risk, percentage	11.00%	9.00%	9.00%	6.00%
Revenue \| Customer C
Revenue from External Customer [Line Items]
Concentration risk, percentage	5.00%	11.00%	7.00%	16.00%
Accounts Receivable [Member] \| Customer A
Revenue from External Customer [Line Items]
Concentration risk, percentage			14.00%	13.00%
Accounts Receivable [Member] \| Customer D
Revenue from External Customer [Line Items]
Concentration risk, percentage			23.00%	14.00%

Subsequent Events (Details) - USD ($)		3 Months Ended	6 Months Ended		12 Months Ended
Subsequent Events (Details) - USD ($)	Apr. 30, 2018	Mar. 30, 2018	Mar. 30, 2018	Mar. 31, 2017	Sep. 29, 2017	May 02, 2018
Subsequent Event [Line Items]
Inventory related impairment charges		$ 2,500,000
Impairment related charges		9,100,000	$ 9,143,000	$ 0
Inventory		143,897,000	143,897,000		$ 136,074,000
Property and equipment		138,542,000	138,542,000		$ 131,019,000
ZTE
Subsequent Event [Line Items]
Inventory related impairment charges			1,300,000
Inventory		1,200,000	1,200,000
Property and equipment		4,400,000	4,400,000
Other assets		1,900,000	$ 1,900,000
Maximum \| ZTE \| Revenue
Subsequent Event [Line Items]
Concentration risk, percentage			2.00%		2.00%
LR4 \| Subsequent Event
Subsequent Event [Line Items]
Cash consideration on sale of product line	$ 5,000,000
Payment milestone period number one	30 days
Payment milestone period number two	60 days
Credit Agreement \| Revolving Credit Facility
Subsequent Event [Line Items]
Credit facility, remaining borrowing capacity		160,000,000.0	$ 160,000,000.0
Credit Agreement \| Revolving Credit Facility \| Subsequent Event
Subsequent Event [Line Items]
Credit facility, remaining borrowing capacity						$ 160,000,000.0
Credit Agreement \| Revolving Credit Facility \| November 2021 [Member] \| Subsequent Event
Subsequent Event [Line Items]
Credit facility, remaining borrowing capacity						130,000,000.0
Credit Agreement \| Revolving Credit Facility \| May 2019 [Member] \| Subsequent Event
Subsequent Event [Line Items]
Credit facility, remaining borrowing capacity						$ 30,000,000.0
Operating Expense [Member]
Subsequent Event [Line Items]
Impairment related charges		$ 6,600,000

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 30, 2018	Sep. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 91,300	$ 84,157
Total liabilities measured at fair value	10,281	42,454
Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured at fair value	1,130	1,679
Common Stock Warrant Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured at fair value	9,151	40,775
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	25,799	26,210
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	179	36
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	65,322	57,911
Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	179	36
Total liabilities measured at fair value	0	0
Active Markets for Identical Assets (Level 1) [Member] \| Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured at fair value	0	0
Active Markets for Identical Assets (Level 1) [Member] \| Common Stock Warrant Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured at fair value	0	0
Active Markets for Identical Assets (Level 1) [Member] \| Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Active Markets for Identical Assets (Level 1) [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	179	36
Active Markets for Identical Assets (Level 1) [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	91,121	84,121
Total liabilities measured at fair value	0	0
Observable Inputs (Level 2) [Member] \| Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured at fair value	0	0
Observable Inputs (Level 2) [Member] \| Common Stock Warrant Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured at fair value	0	0
Observable Inputs (Level 2) [Member] \| Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	25,799	26,210
Observable Inputs (Level 2) [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Observable Inputs (Level 2) [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	65,322	57,911
Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Total liabilities measured at fair value	10,281	42,454
Unobservable Inputs (Level 3) [Member] \| Contingent Consideration [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured at fair value	1,130	1,679
Unobservable Inputs (Level 3) [Member] \| Common Stock Warrant Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured at fair value	9,151	40,775
Unobservable Inputs (Level 3) [Member] \| Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Unobservable Inputs (Level 3) [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	0	0
Unobservable Inputs (Level 3) [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	$ 0	$ 0