Infinera (INFN) 10-K 27 Feb 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 28, 2024	Feb. 21, 2025	Jun. 29, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 28, 2024
Current Fiscal Year End Date	--12-28
Document Transition Report	false
Entity File Number	001-33486
Entity Registrant Name	Infinera Corp
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0560433
Entity Address, Address Line One	6373 San Ignacio Avenue
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95119
City Area Code	408
Local Phone Number	572-5200
Title of 12(b) Security	Common shares, par value $0.001 per share
Trading Symbol	INFN
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction Flag	false
Entity Shell Company	false
Entity Public Float			$ 901,214,832
Entity Common Stock, Shares Outstanding		237,991,137
Entity Central Index Key	0001138639
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 28, 2024
Audit Information [Abstract]
Auditor Name	Ernst & Young LLP
Auditor Location	Dallas, Texas
Auditor Firm ID	42

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Current assets:
Cash and cash equivalents	$ 145,808	$ 172,505
Short-term restricted cash	0	517
Accounts receivable, net	336,552	381,981
Inventory	308,213	431,163
Prepaid expenses and other current assets	155,249	129,218
Total current assets	945,822	1,115,384
Property, plant and equipment, net	249,496	206,997
Operating lease right-of-use assets	36,348	39,973
Intangible assets, net	15,794	24,819
Goodwill	224,233	240,566
Long-term restricted cash	420	837
Other long-term assets	61,645	50,662
Total assets	1,533,758	1,679,238
Current liabilities:
Accounts payable	284,992	299,005
Accrued expenses and other current liabilities	143,385	110,758
Accrued compensation and related benefits	49,942	85,203
Short-term debt, net	482	25,512
Accrued warranty	13,243	17,266
Deferred revenue	134,727	136,248
Total current liabilities	626,771	673,992
Long-term debt, net	667,930	658,756
Long-term accrued warranty	12,264	15,934
Long-term deferred revenue	29,290	21,332
Long-term deferred tax liability	3,035	1,805
Long-term operating lease liabilities	41,601	47,464
Other long-term liabilities	36,352	43,364
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $0.001 par value Authorized shares—25,000 and no shares issued and outstanding	0	0
Common stock, $0.001 par value Authorized shares—500,000 in 2024 and 500,000 in 2023 Issued and outstanding shares—237,396 in 2024 and 230,994 in 2023	237	231
Additional paid-in capital	2,024,810	1,976,014
Accumulated other comprehensive loss	(33,388)	(34,848)
Accumulated deficit	(1,875,144)	(1,724,806)
Total stockholders' equity	116,515	216,591
Total liabilities and stockholders’ equity	$ 1,533,758	$ 1,679,238

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 28, 2024	Dec. 30, 2023
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	237,396,000	230,994,000
Common stock, shares outstanding (in shares)	237,396,000	230,994,000

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Revenue:
Revenue	$ 1,418,446	$ 1,614,128	$ 1,573,242
Cost of revenue:
Amortization of intangible assets	0	10,621	23,138
Restructuring and other related costs	596	2,218	222
Total cost of revenue	873,886	991,216	1,037,466
Gross profit	544,560	622,912	535,776
Operating expenses:
Research and development	300,437	316,879	306,188
Sales and marketing	158,861	166,938	146,445
General and administrative	132,680	124,874	118,602
Amortization of intangible assets	9,025	12,344	14,576
Merger-related charges	23,021	0	0
Restructuring and other related costs	4,186	6,717	10,122
Total operating expenses	628,210	627,752	595,933
Loss from operations	(83,650)	(4,840)	(60,157)
Other income (expense), net:
Interest income	3,383	2,716	893
Interest expense	(32,302)	(30,609)	(26,015)
Gain on extinguishment of debt	0	0	15,521
Other gain (loss), net	(20,457)	15,325	14,247
Total other income (expense), net	(49,376)	(12,568)	4,646
Loss before income taxes	(133,026)	(17,408)	(55,511)
Provision for income taxes	17,312	7,805	20,532
Net loss	$ (150,338)	$ (25,213)	$ (76,043)
Net loss per common share:
Basic (in dollars per share)	$ (0.64)	$ (0.11)	$ (0.35)
Diluted (in dollars per share)	$ (0.64)	$ (0.11)	$ (0.35)
Weighted average shares used in computing net loss per common share:
Basic (in shares)	234,672	226,726	216,376
Diluted (in shares)	234,672	226,726	216,376
Product
Revenue:
Revenue	$ 1,103,131	$ 1,304,229	$ 1,268,624
Cost of revenue:
Cost of revenue	706,498	810,845	852,476
Services
Revenue:
Revenue	315,315	309,899	304,618
Cost of revenue:
Cost of revenue	$ 166,792	$ 167,532	$ 161,630

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (150,338)	$ (25,213)	$ (76,043)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment and other	(5,459)	(9,962)	(40,839)
Actuarial (loss) gain on pension liabilities	7,358	(2,002)	22,538
Amortization of net actuarial (gain) loss	(439)	(413)	326
Net change in accumulated other comprehensive income (loss)	1,460	(12,377)	(17,975)
Comprehensive loss	$ (148,878)	$ (37,590)	$ (94,018)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Adjustment	[1]	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Adjustment	[1]	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Accumulated Deficit Adjustment	[1]
Beginning balance (in shares) at Dec. 25, 2021				211,381
Beginning balance at Dec. 25, 2021	$ 323,771	$ (122,001)		$ 211	$ 2,026,098	$ (196,493)		$ (4,496)	$ (1,698,042)	$ 74,492
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued (in shares)				2,552
ESPP shares issued	15,191			$ 2	15,189
Shares withheld for tax obligations (in shares)				(550)
Shares withheld for tax obligations	(3,714)				(3,714)
Restricted stock units released (in shares)				7,025
Restricted stock units released	7			$ 7
Stock-based compensation	60,411				60,411
Other comprehensive (loss) income	(17,975)							(17,975)
Net loss	(76,043)								(76,043)
Ending balance (in shares) at Dec. 31, 2022				220,408
Ending balance at Dec. 31, 2022	179,647			$ 220	1,901,491			(22,471)	(1,699,593)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued (in shares)				3,514
ESPP shares issued	14,931			$ 4	14,927
Shares withheld for tax obligations (in shares)				(423)
Shares withheld for tax obligations	(2,465)				(2,465)
Restricted stock units released (in shares)				7,495
Restricted stock units released	7			$ 7
Stock-based compensation	62,061				62,061
Other comprehensive (loss) income	(12,377)							(12,377)
Net loss	(25,213)								(25,213)
Ending balance (in shares) at Dec. 30, 2023				230,994
Ending balance at Dec. 30, 2023	216,591			$ 231	1,976,014			(34,848)	(1,724,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld for tax obligations (in shares)				(381)
Shares withheld for tax obligations	(2,129)				(2,129)
Restricted stock units released (in shares)				6,783
Restricted stock units released	6			$ 6
Stock-based compensation	50,925				50,925
Other comprehensive (loss) income	1,460							1,460
Net loss	(150,338)								(150,338)
Ending balance (in shares) at Dec. 28, 2024				237,396
Ending balance at Dec. 28, 2024	$ 116,515			$ 237	$ 2,024,810			$ (33,388)	$ (1,875,144)
[1] (1) Effective December 26, 2021, the Company adopted ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity ("ASU 2020-06"). Accordingly, the Company recorded a $196.5 million reduction to additional paid in capital and a net reduction to accumulated deficit of $74.5 million due to the cumulative of adopting this new standard.

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2021
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Adjustment | Accounting Standards Update 2020-06
Additional paid in capital		$ 196,500
Accumulated deficit		$ 74,500

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 28, 2024		Dec. 30, 2023		Dec. 31, 2022
Cash Flows from Operating Activities:
Net loss		$ (150,338)		$ (25,213)		$ (76,043)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization		62,333		78,784		83,830
Non-cash restructuring charges and other related costs		40		1,200		6,066
Amortization of debt discount and issuance costs		3,680		3,862		6,109
Operating lease expense		9,252		7,464		9,421
Stock-based compensation expense		50,921		62,150		61,015
Gain on extinguishment of debt		0		0		(15,521)
Other, net		(76)		(823)		1,218
Changes in assets and liabilities:
Accounts receivable		40,218		38,511		(69,024)
Inventory		121,772		(57,864)		(89,527)
Prepaid expenses and other current assets		(49,159)		9,683		(34,046)
Accounts payable		(28,258)		(2,921)		88,256
Accrued expenses and other current liabilities		11,568		(40,063)		(24,443)
Deferred revenue		8,727		(25,260)		15,129
Net cash provided by (used in) operating activities		80,680		49,510		(37,560)
Cash Flows from Investing Activities:
Purchase of property and equipment		(75,013)		(62,314)		(46,053)
Net cash used in investing activities		(75,013)		(62,314)		(46,053)
Cash Flows from Financing Activities:
Proceeds from issuance of 2028 Notes		0		98,751		373,750
Repayment of 2024 Notes		(18,747)		(83,446)		(280,842)
Payment of debt issuance cost		0		(2,108)		(12,451)
Proceeds from asset-based revolving credit facility		50,000		50,000		80,000
Repayment of asset-based revolving credit facility		(50,000)		(50,000)		(80,000)
Repayment of mortgage payable		(470)		(510)		(533)
Principal payments on finance lease obligations		(562)		(1,023)		(1,314)
Payment of term license obligation		(10,318)		(10,417)		(7,739)
Proceeds from issuance of common stock		6		14,931		15,189
Tax withholding paid on behalf of employees for net share settlement		(2,129)		(2,465)		(3,714)
Net cash provided by (used in) financing activities		(32,220)		13,713		82,346
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		(1,078)		(16,253)		(12,051)
Net change in cash, cash equivalents, and restricted cash		(27,631)		(15,344)		(13,318)
Cash, cash equivalents, and restricted cash at beginning of period		173,859	[1]	189,203	[1]	202,521
Cash, cash equivalents and restricted cash at end of period	[1]	146,228		173,859		189,203
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net		21,790		14,109		15,126
Cash paid for interest, net		27,359		22,394		14,787
Supplemental schedule of non-cash investing and financing activities:
Transfer of inventory to fixed assets		0		1,847		9,332
Property and equipment included in accounts payable and accrued liabilities		34,385		10,104		7,435
Unpaid term licenses (included in accounts payable, accrued liabilities and other long term liabilities)		$ 14,196		$ 23,326		$ 9,178
[1]Reconciliation of cash, cash equivalents and restricted cash to the consolidated balance sheets: December 28, 2024 December 30, 2023 December 31, 2022 (In thousands) Cash and cash equivalents $ 145,808 $ 172,505 $ 178,657 Short-term restricted cash — 517 7,274 Long-term restricted cash 420 837 3,272 Total cash, cash equivalents and restricted cash $ 146,228 $ 173,859 $ 189,203

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	Dec. 28, 2024		Dec. 30, 2023		Dec. 31, 2022		Dec. 25, 2021
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 145,808		$ 172,505		$ 178,657
Short-term restricted cash	0		517		7,274
Long-term restricted cash	420		837		3,272
Total cash, cash equivalents and restricted cash	$ 146,228	[1]	$ 173,859	[1]	$ 189,203	[1]	$ 202,521
[1]Reconciliation of cash, cash equivalents and restricted cash to the consolidated balance sheets: December 28, 2024 December 30, 2023 December 31, 2022 (In thousands) Cash and cash equivalents $ 145,808 $ 172,505 $ 178,657 Short-term restricted cash — 517 7,274 Long-term restricted cash 420 837 3,272 Total cash, cash equivalents and restricted cash $ 146,228 $ 173,859 $ 189,203

Organization and Basis of Prese

Organization and Basis of Presentation	12 Months Ended
	Dec. 28, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Infinera Corporation (“Infinera” or the “Company”), headquartered in San Jose, California, was founded in December 2000 and incorporated in the State of Delaware. Infinera is a global supplier of networking solutions comprised of networking equipment, optical semiconductors, software and services. Infinera’s portfolio of solutions includes optical transport platforms, converged packet-optical transport platforms, optical line systems, disaggregated router platforms, and a suite of networking and automation software offerings, and support and professional services. Infinera leverages its U.S.-based compound semiconductor fab and in-house packaging capabilities to design, develop, and manufacture industry-leading indium phosphide-based photonic integrated circuits for use in its high-capacity optical communications products. The Company operates and reports financial results on a fiscal year of 52 or 53 weeks ending on the last Saturday of December in each year. Accordingly, fiscal year 2024 was a 52-week year that ended on December 28, 2024. Fiscal year 2023 was a 52-week year that ended on December 30, 2023 and fiscal year 2022 was a 53-week year that ended on December 31, 2022. The next 53-week year will end on December 30, 2028. The accompanying consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”) and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”). The consolidated financial statements include all adjustments necessary for a fair presentation of the Company's annual results. All adjustments are of a normal recurring nature. The consolidated financial statements include the accounts for the Company and its subsidiaries and affiliates in the Company which the Company has a controlling financial interest or is the primary beneficiary. All inter-company balances and transactions have been eliminated. Nokia Merger Agreement On June 27, 2024, Infinera, Nokia Corporation, a company incorporated under the laws of the Republic of Finland (“Nokia”) and Neptune of America Corporation, a Delaware corporation and wholly owned subsidiary of Nokia (“Merger Sub”) entered into an Agreement and Plan of Merger (as it may be amended, modified or waived from time to time, the “Merger Agreement”) that provides for Merger Sub to merge with and into Infinera (the “Merger”), with Infinera surviving the Merger as a wholly owned subsidiary of Nokia. Upon and subject to the terms of the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of Common Stock that is issued and outstanding as of immediately prior to the Effective Time will be automatically canceled, extinguished and converted into, at the election of the holder, the right to receive the following consideration, subject to proration in accordance with the Merger Agreement: • cash in an amount equal to $6.65, without interest thereon (such consideration, the "Cash Consideration"); • a number of ordinary shares, with no nominal value and in book-entry form, of Nokia ("Nokia Shares") based on an exchange ratio of 1.7896 Nokia Shares for each share of Common Stock (the "Share Consideration"); or • cash in an amount equal to $4.66, without interest, and a number of Nokia Shares based on an exchange ratio of 0.5355 for each share of Common Stock (the "Mixed Consideration"). In each case, the Nokia Shares will be delivered in the form of American Depositary Shares (the “Nokia ADSs”), with each Nokia ADS representing the right to one Nokia Share. The election right for holders of Common Stock with respect to the Mixed Consideration and the Share Consideration will be subject to proration pursuant to the terms of the Merger Agreement. Completion of the Merger is subject to customary conditions, including but not limited to the adoption of the Merger Agreement by the Company’s stockholders; the satisfaction of certain domestic and foreign regulatory approvals, filings and authorizations, including antitrust clearance in the United States, antitrust approval by the European Commission, antitrust approval in the United Kingdom and antitrust approvals in other non-U.S. jurisdictions, and in connection with certain foreign investment laws in the U.S. and other specified locations, including filings with The Committee on Foreign Investment in the United States ("CFIUS") and foreign investment authorities in certain non-U.S. jurisdictions; the absence of a law or order preventing, materially enjoining, materially restraining or materially impairing the consummation of the Merger; and performance by the parties in all material respects of all their obligations under the Merger Agreement. The Merger Agreement includes certain customary termination rights for the Company and Nokia. Upon termination of the Merger Agreement in certain circumstances, the Company may be required to pay Nokia a termination fee of $65.0 million, and Nokia may be required to pay the Company a termination fee of $130.0 million. In connection with the Merger, the Company held a special meeting of stockholders on October 1, 2024 (the “Special Meeting”). At the Special Meeting, the Company's stockholders approved the proposal to adopt the Merger Agreement. On September 13, 2024, the applicable waiting period for U.S. antitrust purposes applicable to the Merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, expired. On October 7, 2024, the parties received approval from CFIUS with respect to the Merger. On October 22, 2024, relevant authorities indicated that a filing would not be required under antitrust laws in the United Kingdom at this time. The Merger remains subject to the satisfaction of other customary closing conditions specified in the Merger Agreement. Infinera and Nokia expect the Merger to close in the first quarter of 2025. The foregoing summary of the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Merger Agreement, which is filed as Exhibit 2.2 to this Annual Report on Form 10-K. Other than transaction expenses associated with the proposed Merger of $23.0 million recorded in operating expense in the accompanying consolidated statements of operations for the fiscal year ended December 28, 2024, the terms of the Merger Agreement did not impact the Company’s consolidated financial statements for the fiscal year ended December 28, 2024.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 28, 2024
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates, assumptions and judgments that can affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the consolidated financial statements, as well as the reported amounts of revenue and expenses during the reporting periods. Estimates, assumptions and judgements made by management include inventory valuation, revenue recognition, accounting for income taxes, stock-based compensation, employee benefit and pension plans, manufacturing partner and supplier liabilities, allowances for sales returns, allowances for credit losses, useful life of intangibles and property, plant and equipment, impairment loss related to lease abandonment, accrued warranty, operating and finance lease liabilities, restructuring and other related costs and loss contingencies. The Company bases its assumptions on historical experience and also on assumptions that it believes are reasonable. Actual results could differ materially from those estimates. These estimates may change as new events occur and additional information emerges, and such changes are recognized or disclosed in the Company's consolidated financial statements. Revenue Recognition The Company recognizes revenue when control of the promised goods or services is transferred to its customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company determines revenue recognition by applying the following five-step approach: • identification of the contract, or contracts, with a customer; • identification of the performance obligations in the contract; • determination of the transaction price; • allocation of the transaction price to the performance obligations in the contract; and • recognition of revenue when, or as, the Company satisfies a performance obligation. Many of the Company's product sales are sold in combination with installation and deployment services along with initial hardware and software support. The Company's product sales are also sold at times with spares management, on-site hardware replacement services, network operations management, software subscription services, extended hardware warranty and training. Initial software and hardware support services are generally delivered over a one-year period in connection with the initial purchase. Software warranty provides customers with maintenance releases during the warranty support period and hardware warranty provides replacement or repair of equipment that fails to perform in line with specifications. Software subscription services include software warranty and additionally provides customers with rights to receive unspecified software product upgrades released during the support period. Spares management and on-site hardware replacement services include the replacement of defective units at customer sites in accordance with specified service level agreements. Network operations management includes the day-to-day operation of a customer's network. These services are generally delivered on an annual basis. The Company evaluates each promised good and service in a contract to determine whether it represents a distinct performance obligation or should be accounted for as a combined performance obligation. Services revenue includes software subscription services, installation and deployment services, spares management, on-site hardware replacement services, network operations management, extended hardware warranty and training. Revenue from software subscription services, spares management, on-site hardware replacement services, network operations management and extended hardware warranty contracts is recognized ratably over the contractual support period, which is generally one year, as services are provided over the course of the entire period. Revenue related to training and installation and deployment services is recognized upon completion of the services. Contracts and customer purchase orders are generally used to determine the existence of an arrangement. In addition, shipping documents and customer acceptances, when applicable, are used to verify delivery and transfer of title. The Company typically satisfies its performance obligations upon shipment or delivery of product depending on the contractual terms. Payment terms to customers generally range from net 30 to 120 days from invoice, which are considered to be standard payment terms. The Company assesses its ability to collect from its customers based primarily on the creditworthiness and past payment history of the customer. For sales to resellers, the same revenue recognition criteria apply. It is the Company’s practice to identify an end-customer prior to shipment to a reseller. The Company does not offer refund rights, return rights, or price protection to its resellers. The Company reports revenue net of any required taxes collected from customers and remitted to government authorities, with the collected taxes recorded as current liabilities until remitted to the relevant government authority. Customer Purchase Commitments The Company sells software licenses that provide customers the ability to purchase incremental `bandwidth capacity on an already-deployed hardware. Infinera Instant Bandwidth-enabled systems generally include a specific initial capacity and incremental capacity can be added by the purchase of Instant Bandwidth licenses. Instant Bandwidth licenses are considered distinct performance obligations because customers can provision additional transmission capacity on demand without the deployment of any incremental equipment. Some contracts commit the customer to purchase incremental Instant Bandwidth licenses within a specified time frame from the initial shipment of the Instant Bandwidth-enabled hardware. The time frame varies by customer and generally ranges between 12 to 24 months. If the customer does not purchase the additional capacity within the time frame as stated in the contract, the Company has the right to deliver and invoice such Instant Bandwidth licenses to the customer. Future committed licenses are considered to be additional performance obligations when a minimum purchase obligation is present, as evidenced by enforceable rights and obligations. As such, the Company is required to estimate the variable consideration for future Instant Bandwidth licenses as part of determining the contract transaction price. Contract Termination Rights The contract term is determined on the basis of the period over which the parties to the contract have present enforceable rights and obligations. Certain customer contracts include a termination for convenience clause that allows the customer to terminate services without penalty, upon advance notification. For such contracts, the service duration is limited to the non-cancelable portion of the contract. Variable Consideration The consideration associated with customer contracts is generally fixed. Variable consideration includes discounts, rebates, refunds, credits, incentives, penalties, or other similar items. The amount of consideration that can vary is not a substantial portion of total consideration. Variable consideration estimates are re-assessed at each reporting period until a final outcome is determined. The changes to the original transaction price due to a change in estimated variable consideration will be applied on a retrospective basis, due to system constraints, with the adjustment recorded in the current period. Stand-alone Selling Price The Company allocates the transaction price for a contract among the performance obligations on a relative stand-alone selling price (SSP) basis. The SSP is the price at which an entity would sell a promised product or service separately to a customer. While certain services sold by the Company have readily observable SSPs, the majority of the Company's products and services are generally not sold on a stand-alone basis and therefore SSPs for such products and services are not directly observable. If there is no observable SSP, it is estimated using judgment and considering all reasonably available information including but not limited to, gross margin objectives, pricing practices in customer contracts with multiple goods and services, internal costs, historical profitability data, competitor pricing strategies, as well as other observable inputs. The determination of SSP for performance obligations is assessed on a periodic basis and estimates are revised to reflect any changes to underlying assumptions. Shipping and Handling The Company treats shipping and handling activities as costs to fulfill the Company's promise to transfer products. Shipping and handling fees billed to customers are recorded as a reduction to cost of product. Capitalization of Costs to Obtain a Contract The Company has assessed the treatment of costs to obtain or fulfill a contract with a customer. Under Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" ("ASC 606"), the Company expenses sales commissions as incurred with the exception of sales commissions related to multi-year service contracts, which are paid for upfront, capitalized, and amortized over the service period. Sales commissions paid on service contract renewals are commensurate with the sales commissions paid on the initial contracts. Transaction Price Allocated to the Remaining Performance Obligation The Company’s remaining performance obligations represent the transaction price allocated to performance obligations that are unsatisfied or partially satisfied as of period end, consisting of deferred revenue and non-cancellable backlog. The Company’s backlog represents purchase orders received from customers for future product shipments and services that are unsatisfied or partially satisfied as of period end. The Company’s backlog is subject to future events that could cause the amount or timing of the related revenue to change. Orders in backlog may be fulfilled several quarters following receipt or may relate to multi-year support service obligations. Stock-Based Compensation Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period (generally the vesting period) under the straight-line amortization method. The Company accounts for forfeitures as they occur. The Company estimates the fair value of the rights to acquire stock under its 2007 Employee Stock Purchase Plan (the “ESPP”) using the Black-Scholes option pricing formula. The ESPP, which was indefinitely suspended effective upon the expiration of the offering period that ended August 15, 2023, provides for consecutive six-month offering periods. The Company accounts for the fair value of restricted stock units (“RSUs”) using the closing market price of the Company’s common stock on the date of grant. RSUs typically vest ratably over a service period ranging from one Outstanding Performance Stock Units ("PSUs") granted to the Company's executive officers, senior management and certain other employees in 2023 and prior fiscal years are based on performance criteria related to specific financial or operational targets over the span of a two PSUs granted to the Company's executive officers and senior management during 2024 are based on the Company's total shareholder return ("TSR") as compared to an index of peer companies. The Company estimates the fair value of performance based awards subject to TSR as compared to an index of peer companies using a Monte Carlo simulation valuation model on the date of grant and recognizes the related stock-based compensation expense over the performance period. The Company reverses stock-based compensation expense on performance based awards subject to TSR only when the requisite service period is not reached. The number of shares to be issued upon vesting of these PSUs range from 0 to 2.0 times the target number of PSUs granted. Employee Benefit and Pension Plans The Company operates a number of post-employment plans in Germany, as well as smaller post-employment plans in other countries, including both defined contribution and defined benefit plans. Benefit cost and obligations pertaining to these plans are based on assumptions for the discount rate, expected return on plan assets, mortality rates, expected salary increases, health care cost trend rates and attrition rates. The discount rate assumption is based on current investment yields of high-quality fixed-income securities with maturities similar to the expected benefits payment period. Mortality rates help predict the expected life of plan participants. The expected increase in the compensation levels assumption reflects the Company's actual experience and future expectations. The expected long-term return on plan assets is determined based on asset allocations, historical portfolio results, historical asset correlations and management’s expected returns for each asset class. The Company evaluates its expected return assumptions annually including reviewing current capital market assumptions to assess the reasonableness of the expected long-term return on plan assets. The Company updates the expected long-term return on assets when the Company observes a sufficient level of evidence that would suggest the long-term expected return has changed. Research and Development All costs to develop the Company’s hardware products are expensed as incurred. Software development costs are capitalized beginning when a product’s technological feasibility has been established and ending when a product is available for general release to customers. Generally, the Company’s software products are released soon after technological feasibility has been established. As a result, costs subsequent to achieving technological feasibility have not been significant and all software development costs have been expensed as incurred. Advertising All advertising costs are expensed as incurred. Advertising expenses in 2024, 2023 and 2022 were $1.3 million, $1.5 million, and $1.5 million, respectively. Accounting for Income Taxes As part of the process of preparing its consolidated financial statements, the Company is required to estimate its taxes in each of the jurisdictions in which it operates. This involves calculating current tax expense and recognizing differences in timing for deductible transactions, leading to deferred tax assets and liabilities on its balance sheet. Deferred tax assets are future tax benefits the Company expects to receive when certain expenses become deductible or when tax attributes are used. The realization of these assets depends on future taxable income in the relevant areas where these deductions, losses, and credits can be applied. The Company must assess the likelihood that some portion or all of its deferred tax assets will be recovered from future taxable income within the respective jurisdictions, and to the extent the Company believes that recovery does not meet the “more-likely-than-not” standard, it must establish a valuation allowance. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management judgment is required in determining its provision for income taxes, its deferred tax assets and liabilities and any valuation allowance recorded against our net deferred tax assets. In evaluating the need for a full or partial valuation allowance, all positive and negative evidence must be considered, including considering all sources of income, its current financial performance, its market environment, and other factors. Based on the available objective evidence, at December 28, 2024, management believes it is more likely than not that the net deferred tax assets in the U.S., state, and certain foreign jurisdictions will not be realizable in the foreseeable future. Accordingly, the Company has recorded a valuation allowance against these deferred tax assets. The Company will continue to assess its realizability of deferred tax assets on a quarterly basis. To the extent that the Company determines that deferred tax assets are realizable on a more likely than not basis in the future, and an adjustment is needed, that adjustment will be recorded in the period that the determination is made. Foreign Currency Translation and Transactions The Company considers the functional currencies of its foreign subsidiaries to be the local currency. Assets and liabilities recorded in foreign currencies are translated at the exchange rate as of the balance sheet date, revenue, costs and expenses are translated at average exchange rates in effect during the period. Equity transactions are translated using historical exchange rates. The effects of foreign currency translation adjustments are recorded as a separate component of accumulated other comprehensive income (loss) in the accompanying consolidated balance sheets and consolidated statements of comprehensive loss. For all non-functional currency account balances, the re-measurement of such balances to the functional currency will result in either a foreign exchange transaction gain or loss, which is recorded to other income (loss), net, in the Company's consolidated statement of operations, in the same period that the re-measurement occurred. Aggregate foreign exchange transactions recorded resulted in a loss of $22.0 million in 2024, gain of $14.8 million in 2023, and gain of $12.8 million in 2022. Cash and Cash Equivalents Cash consists primarily of cash in bank deposit accounts which, at times, a portion may exceed federally insured limits. The Company has not experienced any losses in such accounts. The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents. Fair Value Measurement Pursuant to the accounting guidance for fair value measurements and its subsequent updates, fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability. Valuation techniques used by the Company are based upon observable and unobservable inputs. Observable or market inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions about market participant assumptions based on the best information available. Observable inputs are the preferred source of values. These two types of inputs create the following fair value hierarchy: Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 2 – Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 – Prices or valuations that require management inputs that are both significant to the fair value measurement and unobservable. The Company measures its cash equivalents and debt securities at fair value and classifies them in accordance with the fair value hierarchy on a recurring basis. Facilities-related Charges The Company classifies certain facilities-related charges within Level 3 of the fair value hierarchy and applies fair value accounting on a nonrecurring basis when impairment indicators exist or upon the existence of observable fair values. The impairment charges incurred for operating lease right-of-use assets are calculated at fair value based on the estimated future sublease rental receipts that the Company can reasonably obtain over the remaining lease term at the discount rate. These charges are classified as Level 3 measurement due to the significance of these unobservable inputs. Accounts Receivable and Allowances for Credit Losses Accounts receivable are recorded at the invoiced amount and do not bear interest. The Company maintains an allowance for estimated credit losses resulting from the inability of its customers to make required payments and reviewed the allowance quarterly. The Company determines expected credit losses by performing credit evaluations of its customers' financial condition, establishing both an estimated reserve and a specific reserve for customers in adverse financial condition and adjusting for its expectations of changes in conditions that may impact the collectability of outstanding receivables. The Company considers a customer's receivable balance past due when the amount is due beyond the credit terms extended, The Company considers factors such as historical experience, credit quality, age of the accounts receivable balances, current economic trends, reasonable and supportable forecasts and geographic or country-specific risks. Amounts are written off when receivables are determined to be uncollectible. Allowances for Sales Returns Customer product returns are approved on a case-by-case basis. Specific reserve provisions are made based upon a specific review of all the approved product returns where the customer has yet to return the products to generate the related sales return credit at the end of a period. Estimated sales returns are provided for as a reduction to revenue. At December 28, 2024, December 30, 2023 and December 31, 2022, revenue was reduced for estimated sales returns by $0.6 million, $0.3 million, and $3.6 million, respectively. Concentration of Risk Financial instruments that are potentially subject to concentrations of credit risk consist primarily of cash, cash equivalents and restricted cash and accounts receivable. The risk with respect to accounts receivable is mitigated by ongoing credit evaluations that the Company performs on its customers. As the Company continues to expand its sales internationally, it may experience increased levels of customer credit risk associated with those regions. Collateral is generally not required for accounts receivable but may be used in the future to mitigate credit risk associated with customers located in certain geographical regions. One customer accounted for 11% of the Company's accounts receivable balance, net on the consolidated balance sheets as of December 28, 2024. No customer accounted for 10% or more of the Company's accounts receivable balance, net on the consolidated balance sheets as of December 30, 2023. One end-customer accounted for 12% of the Company's revenue in fiscal year 2024. One end-customer accounted for 10% of the Company's revenue in fiscal year 2023 and one end-customer accounted for 11% of the Company's revenue in fiscal year 2022. The Company depends on sole source or limited source suppliers for several key components and raw materials. The Company generally purchases these sole source or limited source components and raw materials through standard purchase orders and does not have long-term contracts with many of these limited-source suppliers. While the Company seeks to maintain sufficient reserve stock of such components and raw materials, the Company’s business and results of operations could be adversely affected if any of its sole source or limited source suppliers suffer from capacity constraints, lower than expected yields, deployment delays, work stoppages or any other reduction or disruption in output. Derivative Instruments From time to time, the Company has entered into factoring agreements to sell certain receivables to unrelated third-party financial institutions. These transactions are accounted for in accordance with ASC 860, Transfers and Servicing (“ASC 860”). ASC 860 and result in a reduction in accounts receivable because the agreements transfer effective control over and risk related to the receivables to the buyers. The Company's factoring agreements do not allow for recourse in the event of uncollectability, and the Company does not retain any interest in the underlying accounts receivable once sold. Inventory Valuation Inventories consist of raw materials, work-in-process and finished goods and are stated at standard cost adjusted to approximate the lower of actual cost or net realizable value. Costs are recognized utilizing the first-in, first-out method. Net realizable value is based upon an estimated selling price reduced by the estimated cost of disposal. The determination of market value involves numerous judgments including estimated average selling prices based upon recent sales volumes, industry trends, existing customer orders, current contract price, future demand and pricing and technological obsolescence of the Company’s products. Inventory that is obsolete or in excess of the Company’s forecasted demand or is anticipated to be sold at a loss is written down to its estimated net realizable value based on historical usage and expected demand. In valuing its inventory costs and deferred inventory costs, the Company considered whether the net realizable value of inventory delivered or expected to be delivered at less than cost, primarily comprised of common equipment, had declined. The Company concluded that, in the instances where the net realizable value of inventory delivered or expected to be delivered was less than cost, it was appropriate to value the inventory costs and deferred inventory costs at cost or net realizable value, whichever is lower, thereby recognizing the cost of the reduction in net realizable value of inventory in the period in which the reduction occurred or can be reasonably estimated. The Company has, therefore, recognized inventory write-downs as necessary in each period in order to reflect inventory at the lower of actual cost or net realizable value. The Company considers whether it should accrue losses on firm purchase commitments related to inventory items. Given that the net realizable value of common equipment is below contractual purchase price, the Company has also recorded losses on these firm purchase commitments in the period in which the commitment is made. When the inventory parts related to these firm purchase commitments are received, that inventory is recorded at the purchase price less the accrual for the loss on the purchase commitment. Property, Plant and Equipment Property, plant and equipment are stated at cost less accumulated depreciation. This includes enterprise-level business software that the Company customizes to meet its specific operational needs and certain software licenses. Depreciation is calculated using the straight-line method over the estimated useful lives of the respective assets. Leasehold improvements are amortized using the straight-line method over the shorter of the lease term or estimated useful life of the asset. An assumption of lease renewal where a renewal option exists is used only when the renewal has been determined to be reasonably certain. Repair and maintenance costs are expensed as incurred. The estimated useful life for each asset category is as follows: Estimated Useful Lives Building 20 years Laboratory and manufacturing equipment 1.5 to 10 years Furniture and fixtures 3 to 5 years Computer hardware 3 to 5 years Computer software 3 years Leasehold and building improvements 1 to 24 years The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of these assets may not be recoverable or that the useful life is shorter than originally estimated. If impairment indicators are present and the projected future undiscounted cash flows are less than the carrying value of the assets, the carrying values are reduced to the estimated fair value. If assets are determined to be recoverable, but the useful lives are shorter than originally estimated, the carrying value of the assets is depreciated over the newly determined remaining useful lives. Accrued Warranty In the Company's contracts with its customers, the Company warrants that its products will operate substantially in conformity with product specifications. Hardware warranties provide the purchaser with protection in the event that the product does not perform to product specifications. During the warranty period, the purchaser’s sole and exclusive remedy in the event of such defect or failure to perform is limited to the correction of the defect or failure by repair, refurbishment or replacement, at the Company’s sole option and expense. The Company's hardware warranty periods generally range from one Goodwill and Intangible Assets Goodwill represents the excess of the purchase price of an acquired business over the fair value of the identifiable assets acquired and liabilities assumed. The Company tests for impairment of goodwill on an annual basis in the fourth quarter and at any other time when events occur or circumstances indicate that the carrying amount of goodwill may not be recoverable. The Company has the option to first assess qualitative factors to determine whether it is necessary to perform the quantitative goodwill impairment test. If the Company determines that as a result of the qualitative assessment that it is more likely than not (i.e., greater than 50% likelihood) that the fair value of a reporting unit is less than its carrying amount, then the quantitative test is required or it can directly perform the quantitative analysis. The Company recognizes an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized does not exceed the total amount of goodwill allocated to that reporting unit. The Company completed its annual qualitative impairment test of goodwill as of the first day of the fourth fiscal quarter of 2024, or September 29, 2024, and determined that it was not more likely than not that the fair value of the reporting unit is less than its carrying amount. As a result, it was determined that it was not necessary for the Company to perform a quantitative goodwill impairment test for the year ended December 28, 2024. The Company evaluates events and changes in circumstances that could indicate carrying amounts of purchased intangible assets with finite lives may not be recoverable. When such events or changes in circumstances occur, the Company assesses the recoverability of these assets by determining whether or not the carrying amount will be recovered through undiscounted expected future cash flows. If the total of the future undiscounted cash flows is less than the carrying amount of an asset, the Company records an impairment loss for the amount by which the carrying amount of the asset exceeds the fair value of the asset. Intangible assets with finite lives are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets. Leases The Company has operating leases primarily for real estate (facilities) and automobiles. The Company has finance leases primarily for computer hardware, laboratory and manufacturing equipment and leasehold and building improvements. The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one The Company determines if an arrangement contains a lease at inception. Operating leases are included in operating lease right-of-use ("ROU") assets, accrued expenses and other current liabilities and operating lease liabilities on the Company's consolidated balance sheets. Finance leases are included in property, plant and equipment, net, accrued expenses and other current liabilities and other long-term liabilities on the Company's consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at comm

Leases

Leases	12 Months Ended
	Dec. 28, 2024
Leases [Abstract]
Leases	Leases The Company has operating leases for real estate (facilities) and automobiles. For the fiscal years ended December 28, 2024, December 30, 2023 and December 31, 2022, operating lease expense included in cost of revenue and operating expenses in the consolidated statements of operations was $15.0 million, $13.9 million and $21.1 million, respectively. Included in operating lease expense were rent expense and impairment charges due to restructuring resulting in abandonment of certain lease facilities, amounting to $1.3 million, $3.0 million and $8.1 million for the fiscal years ended December 28, 2024, December 30, 2023 and December 31, 2022, respectively. Variable lease cost, short-term lease cost and sublease income were immaterial during the fiscal years ended December 28, 2024, December 30, 2023 and December 31, 2022, respectively. The following table presents current and long-term portion of operating lease liabilities as classified in the consolidated balance sheets (in thousands): December 28, 2024 December 30, 2023 Accrued expenses and other current liabilities $ 11,948 $ 11,888 Long-term operating lease liabilities 41,601 47,464 Total operating lease liability $ 53,549 $ 59,352 The Company also has finance leases. The current portion of finance lease liabilities is classified in accrued expenses and other current liabilities and the long-term portion is classified in other long-term liabilities in the consolidated balance sheet. The lease term for these arrangements range from three As of December 28, 2024 and December 30, 2023, finance leases included in property, plant, and equipment, net in the consolidated balance sheets were $3.3 million and $4.5 million, respectively. Finance lease expense includes amortization of the right-of-use assets and interest expense. Total finance lease expense during the fiscal years ended December 28, 2024 and December 30, 2023 was not material. The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of December 28, 2024 (in thousands): Operating Lease Finance Lease Total lease payments (1) $ 101,466 $ 4,619 Less: interest (2) 47,917 387 Present value of lease liabilities $ 53,549 $ 4,232 (1) Refer to Note 12, “Commitments and Contingencies" to the notes to consolidated financial statements for the future minimum lease payments as of December 28, 2024. (2) Calculated using the interest rate for each lease. The following table presents supplemental information for the Company's non-cancelable leases for the fiscal year ended December 28, 2024 (in thousands, except for weighted average and percentage data): Operating Lease Finance Lease Weighted average remaining lease term 15.18 years 3.31 years Weighted average discount rate 10.71 % 10.00 % Cash paid for amounts included in the measurement of lease liabilities $ 16,889 $ 562 Leased assets obtained in exchange for new lease liabilities $ 6,529 $ —

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 28, 2024
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Disaggregation of Revenue The following table presents the Company's revenue disaggregated by revenue source (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Product $ 1,103,131 $ 1,304,229 $ 1,268,624 Services 315,315 309,899 304,618 Total revenue $ 1,418,446 $ 1,614,128 $ 1,573,242 The Company sells its products directly to customers who are predominantly service providers and to channel partners that sell on its behalf. The following tables present the Company's revenue disaggregated by geography, based on the shipping address of the end-customer and by sales channel (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 United States $ 834,472 $ 994,311 $ 870,282 Other Americas 80,260 99,920 101,600 Europe, Middle East and Africa 364,581 359,201 405,328 Asia Pacific 139,133 160,696 196,032 Total revenue $ 1,418,446 $ 1,614,128 $ 1,573,242 Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Direct $ 900,421 $ 1,067,570 $ 1,191,584 Indirect 518,025 546,558 381,658 Total revenue $ 1,418,446 $ 1,614,128 $ 1,573,242 Contract Balances The following table provides information about receivables, contract assets, contract liabilities and deferred revenue from contracts with customers (in thousands): Assets (Liabilities) December 28, 2024 December 30, 2023 Accounts receivable, net $ 336,552 $ 381,981 Contract assets (1) $ 60,039 $ 46,738 Contract liabilities (2) $ (25,350) $ (3,313) Deferred revenue (3) $ (164,017) $ (157,580) (1) Contract assets are included in prepaid and other current assets line in the consolidated balance sheet. (2) Included in this balance are deposits, customer advances and variable rebates and incentives. (3) Included in this balance are amounts related to services that are subject to cancellation and pro-rated refund rights of $55.1 million and $85.9 million as of December 28, 2024 and December 30, 2023, respectively. Revenue recognized for the fiscal year ended December 28, 2024 and December 30, 2023 that was included in the deferred revenue balance at the beginning of the reporting period was $120.8 million and $133.6 million, respectively. Changes in the contract asset and liability balances during the fiscal year ended December 28, 2024 and December 30, 2023 were not materially impacted by other factors. Transaction Price Allocated to the Remaining Performance Obligation The Company’s remaining performance obligations represent the transaction price allocated to performance obligations that are unsatisfied or partially satisfied, consisting of deferred revenue and non- cancellable backlog. The Company’s backlog represents purchase orders received from customers for future product shipments and services. The Company’s backlog is subject to future events that could cause the amount or timing of the related revenue to change. Orders in backlog may be fulfilled several quarters following receipt or may relate to multi-year support service obligations. The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially satisfied) pursuant to contracts that are not subject to cancellation without penalty at the end of the reporting period (in thousands): 2025 2026 2027 2028 2029 Thereafter Total Revenue expected to be recognized in the future as of December 28, 2024 $ 392,383 $ 115,506 $ 52,717 $ 20,735 $ 11,728 $ 4,676 $ 597,745

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 28, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Disclosure of Fair Values Financial instruments that are not re-measured at fair value include cash, accounts receivable, accounts payable, accrued liabilities, and debt. The carrying values of these financial instruments, other than the Company's 2027 Notes and 2028 Notes (as defined below and collectively referred to as "convertible senior notes"), approximate their fair values. The fair value of each series of convertible senior notes was determined based on the quoted bid price of the applicable series of convertible senior notes in an over-the-counter market on December 27, 2024 (the last trading day of the fiscal quarter). The following table presents the estimated fair values of the convertible senior notes (in thousands): As of December 28, 2024 As of December 30, 2023 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Convertible senior notes (1) $ — $ 764,971 $ 764,971 $ — $ 658,609 $ 658,609 (1) Consists of 2027 Notes and 2028 Notes as of December 28, 2024 as the Company repaid the remaining principal balance of the 2024 Notes during the quarter ended September 28, 2024. Refer to Note 11, “Debt” to the notes to consolidated financial statements for more information. Cash equivalents are measured and reported at fair value on a recurring basis. The following table presents the fair value of these financial assets and their levels within the fair value hierarchy (in thousands): As of December 28, 2024 As of December 30, 2023 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Money market funds $ 65,000 $ — $ 65,000 $ 115,000 $ — $ 115,000 During 2024 and 2023, there were no transfers of assets or liabilities between Level 1 and Level 2 of the fair value hierarchy. As of December 28, 2024 and December 30, 2023, none of the Company’s existing securities were classified as Level 3 securities. The Company measures goodwill and intangible assets at fair value on a nonrecurring basis when there are identifiable events or changes in circumstances that may have a significant adverse impact on the fair value of these assets. The Company performed an analysis of impairment indicators of these assets and noted no adverse impact to their fair values as of December 28, 2024. Facilities-related Charges The Company classifies certain facilities-related charges within Level 3 of the fair value hierarchy and applies fair value accounting on a nonrecurring basis when impairment indicators exist or upon the existence of observable fair values. The fair values are classified as Level 3 measurements due to the significance of unobservable inputs. These analyses require management to make assumptions and estimates regarding industry and economic factors, future operating results and discount rates. In connection with its Restructuring Plans (as defined in Note 8, “Restructuring and Other Related Costs” to the notes to consolidated financial statements), the Company incurred facilities related charges of $1.3 million, $3.0 million and $8.1 million for the years ended December 28, 2024, December 30, 2023 and December 31, 2022, respectively. These charges primarily consisted of impairment charges incurred for operating lease right-of-use assets and were calculated at fair value based on estimated future sublease rental receipts that the Company could reasonably obtain over the remaining lease term at the discount rate. Facilities-related charges are classified as Level 3 measurement due to the significance of these unobservable inputs. Cash and Cash Equivalents As of December 28, 2024, the Company had $146.2 million of cash, cash equivalents and restricted cash, including $38.4 million held by its foreign subsidiaries. As of December 30, 2023, the Company had $173.9 million of cash, cash equivalents and restricted cash including $48.1 million held by its foreign subsidiaries. The Company's cash held by its foreign subsidiaries is used for operating and investing activities in those locations, and the Company does not currently have the need or the intent to repatriate those funds to the United States.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 28, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill Goodwill is recorded when the purchase price of an acquisition exceeds the fair value of the net tangible and identified intangible assets acquired. The following table presents details of the Company’s goodwill for the fiscal year ended December 28, 2024 (in thousands): Balance as of December 30, 2023 $ 240,566 Foreign currency translation adjustments (16,333) Balance as of December 28, 2024 $ 224,233 The gross carrying amount of goodwill may change due to the effects of foreign currency fluctuations as a portion of these assets are denominated in foreign currency. To date, the Company has zero accumulated impairment loss on goodwill. Intangible Assets The following tables present details of the Company’s intangible assets with finite life as of December 28, 2024 and December 30, 2023 (in thousands, except for remaining useful life): December 28, 2024 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Remaining Useful Life (In Years) Intangible assets with finite lives: Customer relationships 72,200 (56,406) 15,794 1.8 Total intangible assets with finite lives $ 72,200 $ (56,406) $ 15,794 December 30, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Remaining Useful Life (In Years) Intangible assets with finite lives: Customer relationships and backlog 72,200 (47,381) 24,819 2.8 Total intangible assets with finite lives $ 72,200 $ (47,381) $ 24,819 Amortization expense was $9.0 million, $23.0 million and $37.7 million for the years ended December 28, 2024, December 30, 2023 and December 31, 2022, respectively. The following table summarizes the Company’s estimated future amortization expense of intangible assets with finite life as of December 28, 2024 (in thousands): Total 2025 2026 2027 2028 2029 Thereafter Total future amortization expense $ 15,794 $ 9,025 $ 6,769 $ — $ — $ — $ —

Balance Sheet Details

Balance Sheet Details	12 Months Ended
	Dec. 28, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Details	Balance Sheet Details Restricted Cash The Company’s restricted cash balance is held in deposit accounts at various banks globally. These amounts primarily collateralize the Company’s issuances of standby letters of credit and bank guarantees. Allowance for Credit Losses The following table provides a rollforward of the allowance for credit losses for accounts receivable for the fiscal year ended December 28, 2024 (in thousands): Balance as of December 30, 2023 $ 876 Additions (1) 1,324 Write offs (2) (1,398) Balance as of December 28, 2024 $ 802 (1) The new additions during the fiscal year ended December 28, 2024 are primarily estimated reserves. (2) The write offs during the fiscal year ended December 28, 2024 are primarily for amounts that were previously reserved. Accounts Receivable Factoring The Company sells certain designated trade account receivables based on factoring arrangements with well-established factoring companies. Pursuant to the terms of the arrangements, the Company accounts for these transactions in accordance with ASC 860. The Company's factor purchases trade accounts receivables on a non-recourse basis and without any further obligations. Trade accounts receivables balances sold are removed from the consolidated balance sheets and cash received is reflected as change in Accounts receivable within operating activities in the consolidated statements of cash flow. The difference between the fair value of the Company's trade receivables and the proceeds received is recorded as interest expense in the Company's consolidated statements of operations. For the years ended December 28, 2024, December 30, 2023 and December 31, 2022, the Company's recognized factoring related interest expense was approximately $0.6 million, $0.9 million and $0.9 million, respectively. The gross amount of trade accounts receivables sold totaled approximately $39.5 million and $62.6 million for the fiscal years ended December 28, 2024 and December 30, 2023, respectively. Selected Balance Sheet Items The following table provides details of selected balance sheet items (in thousands): December 28, 2024 December 30, 2023 Inventory Raw materials $ 69,687 $ 133,561 Work in process 67,949 68,407 Finished goods 170,577 229,195 Total $ 308,213 $ 431,163 Property, plant and equipment, net Computer hardware $ 48,459 $ 48,611 Computer software (1) 71,954 74,752 Laboratory and manufacturing equipment 380,417 354,103 Land and building 12,372 12,372 Furniture and fixtures 3,177 2,916 Leasehold and building improvements 46,544 46,652 Construction in progress 97,075 41,328 Subtotal $ 659,998 $ 580,734 Less accumulated depreciation (2) (410,502) (373,737) Total $ 249,496 $ 206,997 Accrued expenses and other current liabilities Loss contingency related to non-cancelable purchase commitments $ 28,242 $ 17,909 Taxes payable 15,292 24,248 Restructuring accrual 1,237 6,042 Short-term operating and finance lease liability 13,594 12,905 Customer contract liabilities (3) 25,350 3,313 Other accrued expenses and other current liabilities 59,670 46,341 Total accrued expenses and other current liabilities $ 143,385 $ 110,758 (1) Included in computer software at December 28, 2024 and December 30, 2023 were $33.5 million and $34.8 million, respectively, related to enterprise resource planning (“ERP”) systems that the Company implemented in prior years. The unamortized ERP costs at December 28, 2024 and December 30, 2023 were $5.4 million and $9.6 million, respectively. Also included in computer software at December 28, 2024 and December 30, 2023 was $27.2 million and $29.6 million, respectively, related to term licenses. The unamortized term license costs at December 28, 2024 and December 30, 2023 was $14.0 million and $23.6 million, respectively. (2) Depreciation expense was $52.9 million, $55.8 million and $46.1 million (which includes depreciation of capitalized ERP costs of $4.8 million, $4.9 million and $3.5 million) for 2024, 2023 and 2022, respectively. Also included in depreciation expense for 2024, 2023 and 2022 was $9.6 million and $9.5 million, and $7.6 million, respectively, related to term licenses. (3) See Note 4, “Revenue Recognition” to the notes to condensed consolidated financial statements for more information.

Restructuring and Other Related

Restructuring and Other Related Costs	12 Months Ended
	Dec. 28, 2024
Restructuring and Related Activities [Abstract]
Restructuring and Other Related Costs	Restructuring and Other Related Costs In 2023, the Company implemented a restructuring initiative to reduce costs (the "2023 Restructuring Plan"). In relation to the 2023 Restructuring Plan, the Company incurred and recorded $6.4 million in total of which $5.9 million was recorded in 2023 and $0.5 million was recorded in 2024. Payments related to the 2023 Restructuring Plan were completed in 2024. In 2024, the Company implemented a restructuring initiative to reduce costs (the "2024 Restructuring Plan"). In relation to the 2024 Restructuring Plan, the Company incurred and recorded $2.9 million of restructuring costs related to the 2024 Restructuring Plan. The 2024 Restructuring Plan was substantially completed in 2024 with the associated payments made in 2024 and 2025. Additional restructuring activities may occur in the future in connection with the Company’s ongoing transformation initiatives. For the years ended December 28, 2024 and December 30, 2023, the Company incurred lease-related impairment charges from consolidation of various sites that resulted in abandonment of related leased facilities. This was a result of restructuring initiatives undertaken in previous years and is unrelated to the charges disclosed above. The following table presents restructuring and other related costs included in cost of revenue and operating expenses in the accompanying consolidated statements of operations under the restructuring plans (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Cost of Revenue Operating Expenses Cost of Revenue Operating Expenses Cost of Revenue Operating Expenses Severance and related expenses $ 596 $ 2,867 $ 2,218 $ 3,665 $ 203 $ 1,834 Lease related impairment charges — 1,319 — 2,996 — 8,059 Asset impairment and others — — — 56 19 229 Total $ 596 $ 4,186 $ 2,218 $ 6,717 $ 222 $ 10,122 Restructuring liabilities are reported within accrued expenses in the accompanying consolidated balance sheets (in thousands): Severance and related expenses Lease related impairment charges Asset impairment and others Total Balance as of December 31, 2022 $ 792 $ — $ 149 $ 941 Charges 5,883 2,996 56 8,935 Cash payments (801) (1,773) (60) (2,634) Non-cash Settlements and Other 13 (1,223) 10 (1,200) Balance as of December 30, 2023 $ 5,887 $ — $ 155 $ 6,042 Charges 3,463 1,319 — 4,782 Cash payments (8,245) (1,302) — (9,547) Non-cash Settlements and Other (14) (17) (9) (40) Balance as of December 28, 2024 $ 1,091 $ — $ 146 $ 1,237 As of December 28, 2024, the Company's restructuring liability was primarily related to the 2024 Restructuring Plan.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 28, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income (loss) includes certain changes in equity that are excluded from net income (loss). The following table sets forth the changes by component for the periods presented (in thousands): Foreign Currency Translation Actuarial Gain (Loss) on Pension Accumulated Tax Effect Total Balance at December 25, 2021 $ (7,829) $ 4,297 $ (964) $ (4,496) Other comprehensive income (loss) before reclassifications (41,803) 22,538 — (19,265) Amounts reclassified from accumulated other comprehensive loss — 326 964 1,290 Net current-period other comprehensive income (loss) (41,803) 22,864 964 (17,975) Balance at December 31, 2022 $ (49,632) $ 27,161 $ — $ (22,471) Other comprehensive loss before reclassifications (9,962) (2,002) — (11,964) Amounts reclassified from accumulated other comprehensive loss — (413) — (413) Net current-period other comprehensive loss (9,962) (2,415) — (12,377) Balance at December 30, 2023 $ (59,594) $ 24,746 $ — $ (34,848) Other comprehensive income (loss) before reclassifications (5,459) 7,358 — 1,899 Amounts reclassified from accumulated other comprehensive loss — (439) — (439) Net current-period other comprehensive income (loss) (5,459) 6,919 — 1,460 Balance at December 28, 2024 $ (65,053) $ 31,665 $ — $ (33,388)

Basic and Diluted Net Loss Per

Basic and Diluted Net Loss Per Common Share	12 Months Ended
	Dec. 28, 2024
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Common Share	Basic and Diluted Net Loss Per Common Share Basic net loss per common share is computed by dividing net loss by the weighted average number of common shares outstanding during the period. Diluted net loss per common share is computed using net loss and the weighted average number of common shares outstanding plus potentially dilutive common shares outstanding during the period. Potentially dilutive common shares include the assumed exercise of outstanding in-the-money stock options, assumed release of outstanding RSUs and PSUs, and assumed issuance of common stock under the ESPP using the treasury stock method. Potentially dilutive common shares also include the shares of common stock issuable upon conversion of the convertible senior notes using the if-converted method, as further discussed in Note 11, “Debt” to the notes to consolidated financial statements. The Company includes the common shares underlying PSUs in the calculation of diluted net income per common share only when they become contingently issuable. The following table sets forth the computation of net loss per common share (in thousands, except per share amounts): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Net loss $ (150,338) $ (25,213) $ (76,043) Weighted average common shares outstanding - basic and diluted 234,672 226,726 216,376 Net loss per common share - basic and diluted $ (0.64) $ (0.11) $ (0.35) The Company incurred net losses during 2024 , 2023 and 2022, and as a result, potential common shares from stock options, RSUs, PSUs and the assumed release of outstanding shares under the ESPP were not included in the diluted shares used to calculate net loss per share, as their inclusion would have been anti-dilutive. Additionally, due to the net loss position during these periods, the Company excluded the potential shares issuable upon conversion of the 2028 Notes, the 2027 Notes and the 2024 Notes in the calculation of diluted earnings per share, as their inclusion would have been anti-dilutive. The following table sets forth the potentially dilutive shares excluded from the computation of the diluted net loss per share because their effect was anti-dilutive (in thousands): As of December 28, 2024 December 30, 2023 December 31, 2022 Convertible senior notes 27,414 32,814 55,800 Restricted stock units 14,695 13,619 14,836 Performance stock units 3,955 3,668 2,685 Employee stock purchase plan shares — 53 360 Total 46,064 50,154 73,681 The Company used the if-converted method for calculating any potential dilutive effect of the convertible senior notes, assuming that all of the convertible senior notes permitted to be share settled were converted solely into shares of common stock at the beginning of the reporting period. The potential impact upon the conversion of the convertible senior notes was excluded from the calculation of diluted net loss per share for the fiscal years ended December 28, 2024, December 30, 2023 and December 31, 2022 because the effect would have been anti-dilutive.

Debt

Debt	12 Months Ended
	Dec. 28, 2024
Debt Disclosure [Abstract]
Debt	Debt The following is a summary of the Company's debt as of December 28, 2024 (in thousands): Net Carrying Value Unpaid Principal Balance Contractual Maturity Date Current Long-Term 2027 Notes $ — $ 197,807 $ 200,000 March 2027 2028 Notes — 464,310 473,750 August 2028 Mortgage 482 5,813 6,295 August 2029 Total Debt $ 482 $ 667,930 $ 680,045 The following is a summary of the Company's debt as of December 30, 2023 (in thousands): Net Carrying Value Unpaid Principal Balance Contractual Maturity Date Current Long-Term 2024 Notes $ 18,747 $ — $ 18,747 September 2024 2027 Notes — 196,829 200,000 March 2027 2028 Notes — 461,927 473,750 August 2028 Mortgage 6,765 — 6,765 May 2024 Total Debt $ 25,512 $ 658,756 $ 699,262 Convertible Senior Notes In September 2018, the Company issued $402.5 million aggregate principal amount of 2.125% Convertible Senior Notes due 2024 (the "2024 Notes"), which matured and were repaid in full on September 1, 2024. In March 2020, the Company issued $200.0 million aggregate principal amount of 2.5% Convertible Senior Notes due 2027 (the “2027 Notes"). In August 2022 and in June 2023, the Company issued $373.8 million and $100 million, respectively, aggregate principal amount of 3.75% Convertible Senior Notes due 2028 (the "2028 Notes," and, together with the 2027 Notes, the “convertible senior notes”). The 2027 Notes bear interest at a fixed rate of 2.5% per year, payable semi-annually in arrears on March 1 and September 1 of each year, beginning on September 1, 2020. The 2028 Notes bear interest at a fixed rate of 3.75% per year, payable semi-annually in arrears on February 1 and August 1 of each year, beginning on February 1, 2023. Each series of the convertible senior notes is governed by an indenture between the Company, as the issuer, and U.S. Bank Trust Company, National Association, as Trustee (individually, each an “Indenture,” and together, the “Indentures”). The convertible senior notes of each series are unsecured and rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the convertible senior notes; equal in right of payment to any of the Company's existing and future liabilities that are not so subordinated, effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of the Company’s current or future subsidiaries. The applicable Indenture governing each series of the convertible senior notes does not contain any financial covenants or any restrictions on the payment of dividends, the incurrence of senior debt or other indebtedness, or the issuance or repurchase of the Company's other securities by the Company. The net proceeds to the Company from the issuance of 2027 Notes were approximately $193.3 million after deducting initial purchasers' fee and other debt issuance costs. The Company used the remaining net proceeds for general corporate purposes, including working capital to fund growth and potential strategic projects. The net proceeds to the Company from the issuance of Existing 2028 Notes (as defined below) were approximately $362.4 million after deducting the initial purchasers' fee and other debt issuance costs. The Company used approximately $283.6 million, which included accrued and unpaid interest, of the net proceeds from this issuance to repurchase approximately $299.8 million in aggregate principal amount of its 2024 Notes concurrently with the issuance. This transaction involved a contemporaneous exchange of cash between the Company and holders of the 2024 Notes participating in the issuance of the Existing 2028 Notes. Accordingly, the transaction was evaluated for modification or extinguishment accounting in accordance with ASC 470-50, Debt – Modifications and Extinguishments on a creditor-by creditor basis depending on whether the exchange was determined to have substantially different terms. The repurchase of the 2024 Notes and issuance of the Existing 2028 Notes were deemed to have substantially different terms based on the present value of the cash flows or significant difference between the value of the conversion option immediately prior to and after the exchange. Therefore, the repurchase of the 2024 Notes was accounted for as a debt extinguishment with an immaterial gain. The Company recorded a $15.5 million gain on extinguishment of debt on its consolidated statements of operations during the fiscal year ended December 31, 2022, which includes the write-off of related deferred issuance costs of $3.5 million. In June 2023, the Company issued $100.0 million in additional aggregate principal amount (the "Additional 2028 Notes") of its currently outstanding 3.75% Convertible Senior Notes due 2028 (the "Existing 2028 Notes"). The Additional 2028 Notes were issued under the indenture dated as of August 8, 2022, by and between the Company and U.S. Bank Trust Company, National Association, as trustee. The Additional 2028 Notes constitute a further issuance of, and form a single series with, the Existing 2028 Notes issued on August 8, 2022 in the aggregate principal amount of $373.8 million and have substantially identical terms, including conversion rate, conversion price, convertible dates, redemption rights, conditions for conversion, settlement provisions and ranking. The net proceeds to the Company from this issuance of Additional 2028 Notes were approximately $96.5 million after deducting the placement agent's fee, other debt issuance costs and discount. The Company used approximately $84.0 million of the net proceeds from this issuance to repurchase approximately $83.9 million in aggregate principal amount, which included accrued and unpaid interest, of its 2024 Notes concurrently with the issuance. This transaction involved a contemporaneous exchange of cash between the Company and holders of the 2024 Notes participating in the issuance of the Additional 2028 Notes. Accordingly, the transaction was evaluated for modification or extinguishment accounting in accordance with ASC 470-50, Debt – Modifications and Extinguishments on a creditor-by-creditor basis depending on whether the exchange was determined to have substantially different terms. The repurchase of the 2024 Notes and issuance of the Additional 2028 Notes were deemed to have substantially different terms based on the present value of the cash flows or significant difference between the value of the conversion option immediately prior to and after the exchange. Therefore, the repurchase of the 2024 Notes was accounted for as a debt extinguishment. Upon maturity of the 2024 Notes on September 1, 2024, the Company repaid the then remaining principal balance of $18.7 million along with accrued interest of $0.2 million. The Company used the remaining net proceeds from the issuance of 2028 Notes for general corporate purposes, including working capital and to fund growth and potential strategic projects. The 2027 Notes and the 2028 Notes mature on March 1, 2027 and August 1, 2028, respectively. The Company did not have the right to redeem the 2027 Notes prior to March 5, 2024 and may not redeem the 2028 Notes prior to August 5, 2025. The Company may redeem for cash all or any portion of the 2027 Notes, at its option, on or after March 5, 2024, and the 2028 Notes, at its option, on or after August 5, 2025, if the last reported sale price of its common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including the trading day immediately preceding the date on which the Company provides notice of redemption at a redemption price equal to 100% of the principal amount of the convertible senior notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. No sinking fund is provided for the convertible senior notes . Conversion Rate and Initial Conversion Price for each series of convertible senior notes are presented in the following table: Conversion Rate per $1,000 Principal Initial Conversion Price 2027 Notes 130.5995 $ 7.66 2028 Notes 147.1183 $ 6.80 Throughout the term of the convertible senior notes, the conversion rate may be adjusted upon the occurrence of certain events, including for any cash dividends. Holders of the convertible senior notes will not receive any cash payment representing accrued and unpaid interest upon conversion. Accrued but unpaid interest will be deemed to be paid in full upon conversion rather than canceled, extinguished or forfeited. Prior to the close of business on the business day immediately preceding December 1, 2026 for the 2027 Notes and May 1, 2028 for the 2028 Notes (the convertible dates), holders may convert their convertible senior notes under the following circumstances: • during any fiscal quarter commencing after the fiscal quarters ended on June 27, 2020 for the 2027 Notes and September 24, 2022 for the 2028 Notes (and only during such fiscal quarter) if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the convertible senior notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; • if the Company calls any or all of the 2027 Notes, or 2028 Notes for redemption, holders of such series may convert their notes at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date of such series called for redemption; • upon the occurrence of specified corporate events described under the Indentures, such as a consolidation, merger or binding share exchange; • or at any time on or after respective convertible dates, until the close of business on the second scheduled trading day immediately preceding the maturity date for such series, holders may convert their respective convertible senior notes at any time, regardless of the foregoing circumstances. Upon the receipt of conversion requests, the settlement of the convertible senior notes will be paid pursuant to the terms of the respective governing Indentures. In the event that any of the 2027 Notes are converted, the Company would be required to repay the principal amount and any conversion premium in any combination of cash and shares of its common stock at the Company’s option. In the event that any of the 2028 Notes are converted, the Company would be required to repay the principal amount in cash and the conversion premium in any combination of cash and shares of its common stock at the Company’s option. If the Company undergoes a fundamental change as defined in the Indentures, holders may require the Company to repurchase for cash all or any portion of their convertible senior notes at a repurchase price equal to 100% of the principal amount of the convertible senior notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, upon the occurrence of a “make-whole fundamental change” (as defined in each of the Indentures), the Company may, in certain circumstances, be required to increase the conversion rate by a number of additional shares for a holder that elects to convert its convertible senior notes in connection with such make-whole fundamental change. There have been no changes to the initial conversion price of the convertible senior notes since issuance. None of the conditions allowing holders of the convertible senior notes to convert early were met. The convertible senior notes were therefore not convertible during 2024. Interest Expense The following table presents the interest expense and the amortization of debt issuance costs related to the convertible senior notes included in Interest expense in the Company's consolidated statements of operations (in thousands): Year Ended December 28, 2024 December 30, 2023 December 31, 2022 Contractual interest expense $ 23,032 $ 22,263 $ 16,589 Amortization of debt issuance costs 3,360 4,064 3,404 Total interest expense $ 26,392 $ 26,327 $ 19,993 The issuance costs related to the 2027 Notes and the 2028 Notes are being amortized to interest expense over the respective contractual term, at effective interest rates of 3.0% and 4.3%, respectively. Unamortized debt issuance costs will be amortized over the remaining life of the 2027 Notes and the 2028 Notes which is approximately 26 months and 43 months, respectively. The net carrying amount of the convertible senior notes as of December 28, 2024, and as of December 30, 2023 was as follows (in thousands): 2024 Notes 2027 Notes 2028 Notes December 28, 2024 December 30, 2023 December 28, 2024 December 30, 2023 December 28, 2024 December 30, 2023 Principal $ — $ 18,747 $ 200,000 $ 200,000 $ 473,750 $ 473,750 Unamortized issuance costs and discount — — (2,193) (3,171) (9,440) (11,823) Net carrying amount $ — $ 18,747 $ 197,807 $ 196,829 $ 464,310 $ 461,927 Asset-based revolving credit facility On June 24, 2022, the Company entered into a Loan, Guaranty and Security Agreement (the “Loan Agreement”) with the lenders party thereto, and Bank of America, N.A., as agent. The Loan Agreement provides for a senior secured asset-based revolving credit facility of up to $200 million (the "Credit Facility"), which the Company may draw upon from time to time. The Company may increase the total commitments under the revolving credit facility by up to an additional $100 million, subject to certain conditions. In addition, the Loan Agreement provides for a $50 million letter of credit subfacility and a $20 million swingline loan facility. The proceeds of the loans under the Loan Agreement may be used to pay the fees, costs, and expenses incurred in connection with the Loan Agreement, repay existing debt and for working capital and general corporate purposes, including to fund growth. The Credit Facility has a stated maturity date of June 24, 2027. Availability under the Credit Facility will be based upon periodic borrowing base certifications valuing certain inventory and accounts receivable, as reduced by certain reserves. The Credit Facility is secured by a first-priority security interest (subject to certain exceptions) in inventory, certain related assets, specified deposit accounts, and certain other accounts. Outstanding borrowings accrue interest at floating rates plus an applicable margin of 1.25% to 1.75% for Term Secured Overnight Financing Rate ("SOFR") rate loans and 0.25% to 0.75% for base rate loans. The unused line fee rate payable on the unused portion of the Credit Facility is equal to 0.25% per annum based on utilization of the Credit Facility. The Loan Agreement contains customary affirmative covenants, such as financial statement reporting requirements and delivery of borrowing base certificates. The Loan Agreement also contains customary covenants that limit the ability of the Company to, among other things, incur debt, create liens and encumbrances, engage in certain fundamental changes, dispose of assets, prepay certain indebtedness, make restricted payments, make investments, and engage in transactions with affiliates. The Loan Agreement also contains a financial covenant that requires the Company to maintain a minimum fixed charge coverage ratio. As of December 28, 2024, the Company was in compliance with all covenants under the Loan Agreement. In connection with the Credit Facility, the Company incurred lender and other third-party costs of approximately $1.2 million, which are recorded as a deferred asset and will be amortized to interest expense using a straight-line method over the term of the Credit Facility. As of December 28, 2024, the Company had availability of $118.9 million under the Credit Facility. As of December 28, 2024, the Loan Agreement included a $50.0 million letter of credit subfacility and $29.2 million letters of credit issued and outstanding. Mortgage Payable The Company has mortgaged a property it owns. T he loan was amended in August 2024, extending its maturity date to August 25, 2029 . The loan carries a fixed interest rate of 7.50% and is re payable in 60 equal monthly installments of approximately $0.1 million, with the remaining principal payment at maturity. As of December 28, 2024, $6.3 million of the loan remained outstanding, of which $0.5 million was included in short-term debt and $5.8 million was included in long-term debt in the consolidated balance sheets.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 28, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The following table sets forth commitments and contingencies related to our various obligations (in thousands): Payments Due by Period Total 2025 2026 2027 2028 2029 Thereafter Operating leases (1)(2) $ 101,466 $ 15,679 $ 12,906 $ 11,405 $ 7,035 $ 3,155 $ 51,286 Financing lease obligations (3) 4,619 1,861 997 951 810 — — Purchase obligations (4) 376,266 364,224 12,042 — — — — 2028 Notes, including interest (5) 544,813 17,766 17,766 17,766 491,515 — — 2027 Notes, including interest (5) 212,500 5,000 5,000 202,500 — — — Mortgage Payable, including interest (5) 8,105 945 945 945 945 4,325 — Total contractual obligations $ 1,247,769 $ 405,475 $ 49,656 $ 233,567 $ 500,305 $ 7,480 $ 51,286 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $6.1 million and $4.6 million as of December 28, 2024 and December 30, 2023, respectively. As of December 28, 2024, $6.1 million is classified as other long-term liabilities on the accompanying consolidated balance sheets. (3) The Company has finance leases for computer hardware and leasehold improvements. The above payment schedule includes interest. See Note 3, "Leases" to the notes to consolidated financial statements for more information. (4) The Company has agreements with its major production suppliers, where the Company is committed to purchase certain parts. As of December 28, 2024, December 30, 2023 and December 31, 2022, these non-cancelable purchase commitments were $376.3 million, $466.3 million and $744.8 million, respectively. (5) Amounts in 2025 are related to interest only. See Note 11, "Debt" to the notes to consolidated financial statements for more information. Legal Matters NextGen Innovations, LLC On August 9, 2022, NextGen Innovations, LLC ("NextGen") filed a complaint against the Company in the United States District Court for the Eastern District of Texas. The complaint asserted that, through certain products, the Company infringed on U.S. Patent Nos. 9,887,795, 10,263,723, and 10,771,181. The complaint alleged that NextGen was entitled to unspecified damages, costs, fees, expenses, interest, and injunctive relief. A Markman hearing was held on November 14, 2023, and the Court issued its claim construction order on December 22, 2023. Fact discovery closed on December 6, 2023, and expert discovery closed on February 4, 2024. On April 14, 2023, the Company filed petitions with the US Patent and Trademark Office ("USPTO") seeking inter partes reviews to invalidate asserted claims of the asserted NextGen patents. On December 4, 2023, the Patent Trial and Appeal Board of the USPTO denied institution of such inter partes reviews. A mediation was held on March 13, 2024, which resulted in a settlement in principle of the action against the Company. Meanwhile, on September 12, 2024, the Court dismissed the action against the Company, with prejudice. In November 2024, the parties finalized and entered into a written settlement agreement, for an immaterial amount, to further memorialize the parties’ settlement of the action. In addition to the matter described above, the Company is subject to various legal proceedings, claims and litigation arising in the ordinary course of business or pursuant to the Merger. While the outcome of these matters is currently not determinable, the Company does not expect that the ultimate costs to resolve these matters will have a material effect on its condensed consolidated financial position, results of operations or cash flows. Loss Contingencies The Company is subject to the possibility of various losses arising in the ordinary course of business. These may relate to disputes, litigation and other legal actions. In the preparation of its quarterly and annual financial statements, the Company considers the likelihood of loss or the incurrence of a liability, including whether it is probable, reasonably possible or remote that a liability has been incurred, as well as the Company’s ability to reasonably estimate the amount of loss, in determining loss contingencies. In accordance with U.S. GAAP, an estimated loss contingency is accrued when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. The Company regularly evaluates current information to determine whether any accruals should be adjusted and whether new accruals are required. As of each of December 28, 2024 and December 30, 2023, the Company has accrued the estimated liabilities associated with certain loss contingencies. Indemnification Obligations From time to time, the Company enters into certain types of contracts that contingently require it to indemnify parties against third-party claims. The terms of such indemnification obligations vary. These contracts may relate to: (i) certain real estate leases under which the Company may be required to indemnify property owners for environmental and other liabilities, and other claims arising from the Company’s use of the applicable premises; and (ii) certain agreements with the Company’s officers, directors and certain key employees, under which the Company may be required to indemnify such persons for liabilities. In addition, the Company has agreed to indemnify certain customers for claims made against the Company’s products, where such claims allege infringement of third-party intellectual property rights, including, but not limited to, patents, registered trademarks, and/or copyrights. Under the aforementioned intellectual property indemnification clauses, the Company may be obligated to defend the customer and pay for the damages awarded against the customer under an infringement claim as well as the customer’s attorneys’ fees and costs. These indemnification obligations generally do not expire after termination or expiration of the agreement containing the indemnification obligation. The Company has also agreed to indemnify the Department of Commerce and its officers, employees, attorneys, and agents for claims related to the DFA (as defined in footnote 18), awards made to the Company pursuant to the DFA and the projects funded by the DFA. In certain cases, there are limits on and exceptions to the Company’s potential liability for indemnification. The Company cannot estimate the amount of potential future payments, if any, that it might be required to make as a result of these agreements. The maximum potential amount of any future payments that the Company could be required to make under these indemnification obligations could be significant. As permitted under Delaware law and the Company’s charter and bylaws, the Company has agreements whereby it indemnifies certain of its officers and each of its directors. The term of the indemnification period is for the officer’s or director’s lifetime for certain events or occurrences while the officer or director is, or was, serving at the Company’s request in such capacity. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements could be significant; however, the Company has a director and officer insurance policy that may reduce its exposure and enable it to recover all or a portion of any future amounts paid. As a result of its insurance policy coverage, the Company believes the estimated fair value of its potential liability under these indemnification agreements is not material.

Guarantees

Guarantees	12 Months Ended
	Dec. 28, 2024
Guarantees [Abstract]
Guarantees	Guarantees Product Warranties Activity related to product warranty was as follows (in thousands): December 28, 2024 December 30, 2023 Beginning balance $ 33,200 $ 36,621 Charges to operations 16,497 22,304 Utilization (16,128) (20,516) Change in estimate (1) (8,062) (5,209) Balance at the end of the period $ 25,507 $ 33,200 (1) The Company records product warranty liabilities based on the latest quality and cost information available as of the date the revenue is recorded. The changes in estimate shown here are due to changes in overall actual failure rates, the mix of new versus used units related to replacement of failed units, and changes in the estimated cost of repair and product recalls. As the Company's products mature over time, failure rates and repair costs associated with such products generally decline leading to favorable changes in warranty reserves. Letters of Credit and Bank Guarantees The Company had $30.0 million and $24.1 million of standby letters of credit, bank guarantees and surety bonds outstanding as of December 28, 2024 and December 30, 2023, respectively. Details are set in below table (in thousands). December 28, 2024 December 30, 2023 Customer performance guarantees $ 25,922 $ 19,068 Value added tax license 2,682 3,127 Property leases 1,356 1,894 Total $ 29,960 $ 24,089 Of the $25.9 million related to customer performance guarantees, approximately $4.0 million was used to secure surety bonds in the aggregate of $7.5 million as of December 28, 2024. Of the $19.1 million related to customer performance guarantees, approximately $4.0 million was used to secure surety bonds in the aggregate of $7.5 million as of December 30, 2023. As of December 28, 2024, of the aforementioned standby letters of credit and bank guarantees outstanding, $1.3 million was backed by cash collateral.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 28, 2024
Share-Based Payment Arrangement [Abstract]
Shareholders' Equity	Stockholders’ Equity 2016 Equity Incentive Plan In February 2016, the Company's board of directors adopted the 2016 Plan and the Company's stockholders approved the 2016 Plan in May 2016. In June 2024, the stockholders approved amendments to the 2016 Equity Incentive Plan to increase the number of shares of common stock reserved for issuance by an additional 7.1 million shares. As of December 28, 2024, the Company reserved a total of 58.9 million shares of common stock for the award of stock options, RSUs and PSUs to employees, non-employees, consultants and members of the Company's board of directors pursuant to the 2016 Plan, plus any shares subject to awards granted under the 2007 Plan that, after the effective date of the 2016 Plan, expire, are forfeited or otherwise terminate without having been exercised in full to the extent such awards were exercisable, and shares issued pursuant to awards granted under the 2007 Plan that, after the effective date of the 2016 Plan, are forfeited to or repurchased by the Company due to failure to vest. The 2016 Plan has a maximum term of 10 years from the date of adoption, or it can be earlier terminated by the Company's board of directors. The 2007 Plan was cancelled and there are no outstanding grants under the 2007 Plan. Employee Stock Purchase Plan In February 2007, the Company's board of directors adopted the ESPP and the Company's stockholders approved the ESPP in May 2007. The ESPP was amended by the stockholders in May 2019 to increase the shares authorized under the ESPP to a total of approximately 31.6 million shares of common stock. The ESPP has a 20-year term. Eligible employees may purchase the Company’s common stock through payroll deductions at a price equal to 85% of the lower of the fair market values of the stock as of the beginning or the end of six-month offering periods. An employee’s payroll deductions under the ESPP are limited to a maximum of 15% of the employee’s compensation and an employee may not purchase more than 3,000 shares per purchase period. The Company's ESPP was indefinitely suspended, effective upon the expiration of the offering period that ended August 15, 2023. Shares Reserved for Future Issuances Common stock reserved for future issuance was as follows (in thousands): December 28, 2024 Outstanding stock awards 16,243 Reserved for future award grants 9,709 Reserved for future ESPP 1,098 Total common stock reserved for stock options and awards 27,050 Stock-based Compensation Plans The Company has stock-based compensation plans pursuant to which the Company has granted stock options, RSUs and PSUs. The Company also has an ESPP for all eligible employees. The following tables summarize the Company’s equity award activity and related information (in thousands, except per share data): Number of Weighted-Average Aggregate Outstanding at December 25, 2021 11,607 $ 7.66 $ 110,849 RSUs granted 8,897 $ 8.26 RSUs released (6,690) $ 7.52 $ 46,104 RSUs canceled (1,226) $ 7.89 Outstanding at December 31, 2022 12,588 $ 8.13 $ 84,847 RSUs granted 6,990 $ 6.97 RSUs released (7,496) $ 8.1 $ 43,001 RSUs canceled (546) $ 8.01 Outstanding at December 30, 2023 11,536 $ 7.45 $ 54,802 RSUs granted 9,093 $ 4.88 RSUs released (6,378) $ 7.66 $ 37,123 RSUs canceled (1,519) $ 6.41 Outstanding at December 28, 2024 12,732 $ 5.64 $ 83,649 Number of Weighted-Average Aggregate Outstanding at December 25, 2021 2,114 $ 6.66 $ 20,184 PSUs granted 899 $ 8.38 PSUs released (335) $ 5.40 $ 2,592 PSUs canceled (119) $ 7.19 Outstanding at December 31, 2022 2,559 $ 7.40 $ 17,251 PSUs granted 1,835 $ 7.26 PSUs canceled (741) $ 5.94 Outstanding at December 30, 2023 3,653 $ 7.63 $ 17,352 PSUs granted 1,224 $ 6.80 PSUs released (405) $ 8.61 $ 2,047 PSUs canceled (961) $ 7.19 Outstanding at December 28, 2024 3,511 $ 7.34 $ 23,068 The aggregate intrinsic value of unreleased RSUs and unreleased PSUs is calculated using the closing price of the Company's common stock of $6.57 at December 27, 2024. The aggregate intrinsic value of RSUs and PSUs released is calculated using the fair market value of the common stock at the date of release. The following table presents total stock-based compensation cost for instruments granted but not yet recognized, net of forfeitures, of the Company’s equity compensation plans as of December 28, 2024. These costs are expected to be amortized on a straight-line basis over the following weighted-average periods (in thousands, except for weighted-average period): Unrecognized Weighted- RSUs $ 52,350 1.57 PSUs $ 7,281 1.92 Employee Stock Purchase Plan The Company's ESPP was indefinitely suspended, effective upon the expiration of the offering period that ended August 15, 2023. The fair value of the ESPP shares was estimated at the date of grant using the following assumptions: Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Volatility n/a 60% - 63% 39% - 63% Risk-free interest rate n/a 3.12% - 4.98% 0.67% - 3.12% Expected life n/a 0.5 years 0.5 years Estimated fair value n/a $1.91 - $2.37 $1.91 - $2.21 The expected dividend yield is zero for the Company as it does not expect to pay dividends in the future. ESPP activity was as below (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Stock-based compensation expense $ — $ 3,798 $ 5,551 Employee contributions $ — $ 14,930 $ 15,189 Shares purchased — 3,514 2,552 Restricted Stock Units Pursuant to the 2016 Plan, the Company has granted RSUs to employees, non-employee members of the Company's board of directors and consultants. All RSUs awarded are subject to each individual's continued service to the Company through each applicable vesting date. The Company accounted for the fair value of the RSUs using the closing market price of the Company’s common stock on the date of grant. Performance Stock Units Pursuant to the 2016 Plan, the Company has granted PSUs to certain of the Company’s executive officers, senior management and certain employees. All PSUs awarded are subject to each individual's continued service to the Company through each applicable vesting date and if the performance metrics are not met within the time limits specified in the award agreements, the PSUs will be canceled. PSUs granted to the Company's executive officers, senior management and certain other employees under the 2016 Plan during 2023, 2022, 2021 and 2020 are based on performance criteria related to a specific financial target over the span of a two PSUs granted to the Company's executive officers and senior management during 2024 are based on the Company's total shareholder return ("TSR") as compared to an index of peer companies. The Company estimates the fair value of performance based awards subject to TSR as compared to an index of peer companies using a Monte Carlo simulation valuation model on the date of grant and recognizes the related stock-based compensation expense over the performance period. The Company reverses stock-based compensation expense on performance based awards subject to TSR only when the requisite service period is not reached. The number of shares to be issued upon vesting of these PSUs ranges from 0 to 2.0 times the target number of PSUs granted. Assumptions for awards granted during 2024 include the following: Year Ended December 28, 2024 Historical volatility of Infinera common stock 53.28% - 58.30% Correlation coefficient 0.4740 - 0.4858 Expected life in years 2.52 - 2.79 years Risk-free interest rate 4.25% - 4.5% Expected dividend yield —% The following table summarizes by grant year, the Company’s PSU activity for the fiscal year ended December 28, 2024 (in thousands): Total Number of Performance Stock Units 2020 2021 2022 2023 2024 Outstanding at December 30, 2023 3,653 350 602 899 1,802 — PSUs granted 1,224 — — — — 1,224 PSUs released (405) — (405) — — — PSUs canceled (961) (350) (197) (137) (245) (32) Outstanding at December 28, 2024 3,511 — — 762 1,557 1,192 Stock-based Compensation Expense The following table summarizes the amortization of stock-based compensation expense related to the RSUs, and PSUs (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 RSUs $ 49,731 $ 52,723 $ 54,102 PSUs $ 1,199 $ 5,545 $ 1,636 The following table summarizes the effects of stock-based compensation on the Company’s consolidated balance sheets and statements of operations for the periods presented (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Stock-based compensation effects in inventory $ 1,795 $ 3,895 $ 3,979 Income tax benefit associated with stock-based compensation $ 9,133 $ 8,165 $ 8,588 Stock-based compensation effects in net loss before income taxes Cost of revenue $ 7,621 $ 10,000 $ 9,485 Research and development 18,779 22,474 23,553 Sales and marketing 12,175 13,699 13,311 General and administrative 12,346 15,977 14,666 Total stock-based compensation expense $ 50,921 $ 62,150 $ 61,015

Income Taxes

Income Taxes	12 Months Ended
	Dec. 28, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The following is a geographic breakdown of the loss before income taxes (in millions): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Domestic $ (54.2) $ 47.6 $ (75.7) International (78.8) (65.0) 20.2 Loss before income taxes $ (133.0) $ (17.4) $ (55.5) The following is a geographic breakdown of the provision for income taxes (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Current: Federal $ 357 $ 1,278 $ 945 State 2,966 3,035 1,537 Foreign 14,200 5,672 20,616 Total current $ 17,523 $ 9,985 $ 23,098 Deferred: Federal $ — $ — $ — State — — — Foreign (211) (2,180) (2,566) Total deferred $ (211) $ (2,180) $ (2,566) Total provision for income taxes $ 17,312 $ 7,805 $ 20,532 The provision for (benefit from) income taxes differs from the amount computed by applying the statutory federal income tax rates as follows: Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Expected tax at federal statutory rate 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit (0.9) % (15.5) % (2.3) % Tax credits 5.6 % (37.9) % 10.2 % Stock-based compensation (3.6) % (42.3) % (10.2) % Change in valuation allowance (23.3) % 20.7 % (19.1) % Foreign rate differential (5.2) % 4.8 % (7.6) % Non-deductible expenses (0.6) % (5.7) % (16.1) % Other taxes on foreign operations (4.3) % (24.1) % (5.0) % Return to provision (0.5) % 44.2 % (3.7) % Uncertain tax positions (1.4) % (3.6) % (1.8) % Prior year adjustment — % (4.4) % (1.0) % Other 0.2 % (2.0) % (1.5) % Effective tax rate (13.0) % (44.8) % (37.1) % For 2024, the Company's income tax expense was $17.3 million with effective tax rate of (13.0)%. The difference between the effective tax rate and the U.S federal statutory rate of 21% is due to tax credits, foreign income taxed at different rates, impact due to foreign currency translation, and valuation allowance. For 2023, the Company's income tax expense was $7.8 million with an effective tax rate of (44.8)%. The difference between the effective tax rate and the U.S federal statutory rate of 21% was due to state income taxes, tax credits, stock-based compensation, foreign income taxed at different rates, impact due to foreign currency translation, foreign income inclusions in the U.S., foreign tax credit expiration, and losses in foreign jurisdictions that require a valuation allowance. For 2022, the Company's income tax expense was $20.5 million with an effective tax rate of (37.1)%. The difference between the effective tax rate and the U.S. federal statutory rate of 21% was primarily the result of tax credits, stock-based compensation, foreign income taxed at different rates and valuation allowances. Deferred tax assets and liabilities are recognized for the future tax consequences of differences between the carrying amounts of assets and liabilities and their respective tax basis using enacted tax rates in effect for the year in which the differences are expected to reverse. Significant deferred tax assets and liabilities consist of the following (in thousands): Years Ended December 28, 2024 December 30, 2023 Deferred tax assets: Net operating losses $ 278,932 $ 296,449 Research and foreign tax credits 142,844 137,130 Non-deductible accruals 56,755 63,763 R&D expense capitalization 84,945 65,125 Inventory valuation 13,908 13,612 Leasing Liabilities 20,772 23,917 Stock-based compensation 4,503 4,016 Property, plant and equipment 781 — Total deferred tax assets $ 603,440 $ 604,012 Valuation allowance (580,577) (576,998) Net deferred tax assets $ 22,863 $ 27,014 Deferred tax liabilities: Property, plant and equipment $ — $ (281) Right of use asset (15,230) (17,946) Acquired intangible assets (2,969) (4,113) Total deferred tax liabilities $ (18,199) $ (22,340) Net deferred tax assets (liabilities) $ 4,664 $ 4,674 The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. The Company must consider all positive and negative evidence, including the Company's forecasts of taxable income over the applicable carryforward periods, its current financial performance, its market environment, and other factors in evaluating the need for a full or partial valuation allowance against its net U.S. deferred tax assets. Based on the available objective evidence, management believes it is more likely than not that the domestic net deferred tax assets will not be realizable in the foreseeable future. Accordingly, the Company has provided a full valuation allowance against its domestic deferred tax assets, net of deferred tax liabilities, as of December 28, 2024 and December 30, 2023. The Company intends to continue maintaining a full valuation allowance on its domestic deferred tax assets until there is sufficient evidence to support the reversal of all or some portion of these allowances. However, considering the Company's current assessment of the probability of maintaining profitability, there is a reasonable possibility that, within the next year or two, sufficient positive evidence may become available to reach a conclusion that a portion of the valuation allowance will no longer be needed. As such, the Company may release a portion of its valuation allowance against its deferred tax assets within the next 12-24 months. This release, if any, would result in the recognition of certain deferred tax assets and a decrease to income tax expense for the period such release is recorded. The Company files tax returns in numerous jurisdictions. The results of our operations outside of the United States are consolidated for financial reporting; however, earnings from investments in non-U.S. operations are included in domestic taxable income only when actually or constructively received. No deferred taxes have been provided on the undistributed gross book-tax basis differences of our non-U.S. operations because we have the ability to and intend to permanently reinvest these basis differences overseas. Beginning in 2022, the Tax Cuts and Jobs Act of 2017 eliminated the right to deduct research and development expenditures for tax purposes in the period the expenses were incurred and instead requires all U.S. and foreign research and development expenditures to be amortized over five and fifteen tax years, respectively. Due to this required capitalization of research and development expenditures, the Company has recorded a U.S. current income tax expense of $3.3 million for the year ended December 28, 2024. The U.S. current income tax provision is primarily for state taxes we anticipate paying as a result of statutory limitations on our ability to offset expected taxable income with net operating loss and research and development credit carry forwards. The increase in federal taxable income due to Section 174 capitalization is offset by net operating carryover balance. It is expected that Section 174 capitalization will continue to generate federal and state taxable income in future years and continue to utilize net operating loss and other available tax credits. As of December 28, 2024, the Company had net operating loss carryforwards of approximately $393.1 million for federal income tax purposes. The Company had net operating loss carryforwards of approximately $319.8 million for state income tax purposes which will continue to expire in 2025 if unused. The Company also had foreign net operating loss carryforwards of approximately $844.5 million. As of December 28, 2024, the Company also had R&D credit carryforwards of approximately $61.1 million for federal income tax and $46.6 million for state income tax purposes. The federal R&D tax credits will continue to expire in 2025 if unused. State R&D tax credits carry forward indefinitely. As of December 28, 2024, the Company had foreign tax credit carryforwards of approximately $35.1 million for federal income tax. The foreign tax credits will continue to expire in 2025 if unused. Infinera Canada Inc., an indirect wholly-owned subsidiary, has Scientific Research and Experimental Development Expenditures (“SRED”) credits available of $6.7 million to offset future Canadian income tax payable as of December 28, 2024, and will continue to expire in 2025 if unused. Infinera Portugal has SIFIDE Credit of $4.9 million to offset future Portugal's income tax payable as of December 28, 2024, and will continue to expire in 2025 if unused. The federal and state net operating loss carryforwards may be subject to significant limitations under Section 382 and Section 383 of the Internal Revenue Code of 1986 and similar provisions under state law. The Tax Reform Act of 1986 contains provisions that limit the federal net operating loss carryforwards that may be used in any given year in the event of special occurrences, including significant ownership changes. The Company has completed a Section 382 review and has determined that none of its operating losses will expire solely due to Section 382 limitation(s). The aggregate changes in the balance of gross unrecognized tax benefits were as follows (in thousands): December 28, 2024 December 30, 2023 December 31, 2022 Beginning balance $ 74,171 $ 57,849 $ 54,250 Tax position related to current year Additions 1,020 1,417 1,536 Tax positions related to prior years Additions 6,167 20,638 7,220 Reductions (1,948) (5,578) (4,832) Lapses of statute of limitations (110) (155) (325) Ending balance $ 79,300 $ 74,171 $ 57,849 As of December 28, 2024, the cumulative unrecognized tax benefit was $79.3 million, of which $70.8 million are related to tax credits. The $70.8 million was netted against deferred tax assets, and would have otherwise been subjected with a full valuation allowance. Of the total unrecognized tax benefit as of December 28, 2024, approximately $10.5 million, if recognized, would impact the Company’s effective tax rate. The amount of unrecognized tax benefit could be reduced upon expiration of the applicable statute of limitation. The potential reduction in unrecognized tax benefits during the next 12 months is not expected to be material. As of December 28, 2024, December 30, 2023 and December 31, 2022, the Company had $1.9 million, $1.5 million and $1.3 million, respectively, of accrued interest and penalties related to unrecognized tax benefits. The Company’s policy is to include interest and penalties related to unrecognized tax benefits within the Company’s provision for income taxes. The Company is subject to taxation in the U.S. and various state and foreign jurisdictions. We are also under routine examination by federal, various state and foreign tax authorities. We believe that adequate amounts have been reserved in these jurisdictions. To the extent we have tax attribute carryforwards, the tax years in which the attribute was generated may still be adjusted upon examination by the federal, state or foreign tax authorities to the extent utilized in a future period. As a large taxpayer, we are currently under audit by multiple state and foreign jurisdictions for various open tax years. Although the timing of the resolution and/or closure of audits is highly uncertain, it is reasonably possible that the balance of gross unrecognized tax benefits could significantly change in the next 12 months. Given the number of years remaining subject to examination, we are unable to estimate the full range of possible adjustments to the balance of gross unrecognized tax benefits. Any changes to unrecognized tax benefits that are reasonably possible to occur within the next 12 months are not expected to be material.

Segment Information

Segment Information	12 Months Ended
	Dec. 28, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information The Company has one business activity as a provider of optical transport networking equipment, software and services. Accordingly, the Company is considered to be in a single reporting segment and operating unit structure. The Company’s CODM is the Company’s Chief Executive Officer (“CEO”), who reviews financial information presented on a consolidated basis. The CODM uses consolidated revenue for product and services, revenue by geographic region, non-GAAP operating income, along with the related GAAP operating income, to assess financial performance and allocate resources. These financial metrics are used by the CODM to make key operating decisions, such as the allocation of resources among research and development, sales and marketing and general and administrative expenses. Reconciliation of Income (Loss) from Operations was as below (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 GAAP as reported $ (83,650) $ (4,840) $ (60,157) Stock-based compensation 50,921 62,150 61,015 Amortization of acquired intangible assets 9,025 22,965 37,714 Restructuring and other related costs 4,782 8,935 10,344 Merger-related charges 23,021 — — Inventory related charges — — 14,381 Global distribution center transition costs — — 2,109 Warehouse fire loss (recovery) — (1,985) 2,232 Litigation charges — — 1,350 Non-GAAP as adjusted $ 4,099 $ 87,225 $ 68,988 Revenue by geographic region is based on the shipping address of the end-customer. For more information regarding revenue disaggregated by geography, see Note 4, “Revenue Recognition” to the notes to consolidated financial statements. Additionally, the following table sets forth our property, plant and equipment, net by geographic region (in thousands): December 28, 2024 December 30, 2023 United States $ 232,041 $ 188,684 Other Americas 3,894 2,777 Europe, Middle East and Africa 8,779 9,973 Asia Pacific 4,782 5,563 Total property, plant and equipment, net $ 249,496 $ 206,997

Employee Benefit and Pension Pl

Employee Benefit and Pension Plans	12 Months Ended
	Dec. 28, 2024
Retirement Benefits [Abstract]
Employee Benefit and Pension Plans	Employee Benefit and Pension Plans Defined Contribution Plans The Company has established a savings plan under Section 401(k) of the Code (the “401(k) Plan”). As allowed under Section 401(k) of the Code, the 401(k) Plan provides tax-deferred salary contributions for eligible U.S. employees. Employee contributions are limited to a maximum annual amount as set periodically by the Code. The Company made voluntary cash contributions and matched a portion of employee contributions of $3.0 million, $3.0 million and $3.0 million for 2024, 2023, and 2022, respectively. Expenses related to the 401(k) Plan were insignificant for each of the years 2024, 2023, and 2022. The Company has an ITP pension plan covering its Swedish employees. Commitments for old-age and survivors' pension for salaried employees in Sweden are vested through an insurance policy. Expenses related to the ITP pension plan were $2.3 million, $2.2 million and $2.5 million for 2024, 2023, and 2022, respectively. The Company also provides defined contribution plans in certain foreign countries where required by local statute or at the Company's discretion. The Company incurred $5.1 million, $4.8 million, and $4.9 million in expense related to post-retirement costs for 2024, 2023, and 2022, respectively. Pension Plans Pension and Post-Retirement Benefit Plans The Company has a number of post-employment plans in Germany, as well as a number of smaller post-employment plans in other countries, including both defined contribution and defined benefit plans. The defined benefit plans expose the Company to actuarial risks such as, investment risk, interest rate risk, life expectancy risk and salary risk. The characteristics of the defined benefit plans and the risks associated with them vary depending on legal, fiscal, and economic requirements. Obligations and Funded Status The following table sets forth the changes in benefits obligations and the fair value of plan assets of the Company's benefit plans (in thousands): December 28, 2024 December 30, 2023 Benefit obligation at beginning of year $ 85,157 $ 76,172 Service cost 126 163 Interest cost 2,840 3,103 Benefits paid (3,951) (4,700) Actuarial loss (gain) (854) 7,156 Employee contributions 22 18 Foreign currency exchange rate changes (5,278) 3,245 Benefit obligation at end of year (1) $ 78,062 $ 85,157 Fair value of plan assets at beginning of year $ 76,577 $ 66,455 Actual return on plan assets 9,340 7,793 Payments (7,086) (767) Employee contributions 22 124 Employer contributions 96 78 Foreign currency exchange rate changes (4,581) 2,894 Fair value of plan assets at end of year $ 74,368 $ 76,577 Net liability recognized $ 3,694 $ 8,580 (1) The Company's accumulated benefit obligation was $77.6 million and $84.7 million at December 28, 2024 and December 30, 2023, respectively. The net liability is included in the line item other long-term liabilities in the Company's consolidated balance sheets. The following table presents net amounts of non-current assets and current and non-current liabilities for the Company's pension and other post-retirement benefit plans recognized on its consolidated balance sheet (in thousands): December 28, 2024 December 30, 2023 Other non-current assets $ 74,368 $ 76,577 Other long-term liabilities (78,062) (85,157) Net liability recognized $ (3,694) $ (8,580) Components of Net Periodic Benefit Cost Net periodic benefit cost for the Company's pension and other post-retirement benefit plans consisted of the following (in thousands): Years ended December 28, 2024 December 30, 2023 December 31, 2022 Service cost $ 126 $ 163 $ 300 Interest cost 2,840 3,103 1,249 Expected return on plan assets (2,930) (2,639) (2,936) Amortization of net actuarial (gain) loss (439) (413) 326 Total net periodic (benefit) cost $ (403) $ 214 $ (1,061) Actuarial gains and losses are amortized using a corridor approach. The gain/loss corridor is equal to 10% of the greater of the pension benefit obligation and the market-related value of assets. Gains and losses in excess of the corridor are generally amortized over the average future working lifetime of the pension plan participants. The service cost component is included in operating expenses in the Company's consolidated statements of operations. All other components are included in Other income (expense), net in the Company's consolidated statements of operations. The following table sets forth the changes in accumulated other comprehensive income (loss) for the Company's benefit plans (pre-tax) (in thousands): December 28, 2024 December 30, 2023 Beginning balance $ 24,746 $ 27,161 Net actuarial (gain) loss arising in current year 7,358 (2,002) Amortization of net actuarial (gain) loss (1) (439) (413) Ending balance $ 31,665 $ 24,746 (1) The actuarial loss for the fiscal year ended December 28, 2024 is primarily due to the change in the discount rate. Amounts recorded in accumulated other comprehensive income (loss) expected to be amortized as a part of net periodic pension cost during 2025 is $1.4 million (pre-tax). Assumptions Certain actuarial assumptions used in computing the benefit obligations for the major plans are as follows: December 28, 2024 December 30, 2023 Discount rate 3.48 % 3.51 % Salary growth rate 2.25 % 2.50 % Pension growth rate 2.00 % 2.25 % Expected long-term rate of return on plan assets 3.93 % 3.93 % Investment Policy The financial position of the Company’s funded status is the difference between the fair value of plan assets and projected benefit obligations. Volatility in funded status occurs when asset values change differently from liability values and can result in fluctuations in costs in financial reporting. The Company’s investment policies and strategies are designed to increase the rate of assets to plan liabilities at an appropriate level of funded status volatility. Asset allocation decisions are recommended by the trustees for the specific plan and agreed to by the Company's management. Investment objectives are designed to generate returns that will enable the plan to meet its future obligations. The Company's management reviews the investment strategy and performance semi-annually and discuss alternatives to manage volatility. Basis for Expected Long-Term Rate of Return on Plan Assets The expected long-term rate of return on plan assets reflects the expected returns for each major asset class in which the plan invests and the weight of each asset class in the target mix. Expected asset returns reflect the current yield on government bonds, risk premiums for each asset class and expected real returns which considers each country’s specific inflation outlook. The expected return is set using a low to medium risk profile and to meet the market expectations over a longer period of time to meet the obligations in the future. Fair Value of Plan Assets The following tables present the fair value of plan assets for pension and other benefit plans by major asset category (in thousands): As of December 28, 2024 December 30, 2023 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Cash $ 661 $ — $ 661 $ 677 $ — $ 677 Equity fund — 50,656 50,656 — 51,226 51,226 Insurance contracts — 23,051 23,051 — 24,674 24,674 Total plan assets at fair value $ 661 $ 73,707 $ 74,368 $ 677 $ 75,900 $ 76,577 Valuation Techniques The following describes the valuation techniques used to measure the fair value of the assets shown in the table above. Equity funds are invested in traded securities and are recorded at market value as of the balance sheet date. Insurance contracts are recorded at cash surrender value of the policies. Mixed fund and pension fund are valued at the amounts as provided by the insurance companies who manage the funds and represent fair market value at the date of the balance sheet. Transfers Between Levels Any transfers between levels in the fair value hierarchy are recognized as of the end of the reporting period. No material transfers between levels occurred during the fiscal year ended December 28, 2024. Future Contributions In 2025, the Company does not expect to make additional contributions to the plan. Cash Flows Estimated future benefit payments under the Company's pension plans as of December 28, 2024 are as follows (in thousands): 2025 $ 5,779 2026 4,191 2027 3,854 2028 4,336 2029 4,202 2030 to 2034 22,684

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 28, 2024
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event The Company evaluated subsequent events through the date these financial statements were available to be issued and filed with the SEC. On January 16, 2025, the Company entered into a direct funding agreement (the “Direct Funding Agreement”) with the U.S. Department of Commerce (the “DOC”) under the Creating Helpful Incentives to Produce Semiconductors and Science Act of 2022 (the “CHIPS Act”). Under the Direct Funding Agreement, the DOC has agreed to award the Company up to $93 million in direct funding (the “Awards”) related to the construction of a fabrication facility located in California and a photonics packaging and test facility located in Pennsylvania (the “Projects”). The DOC will disburse the Awards funding to the Company based on the achievement of various milestones, with each disbursement reimbursing the Company for eligible uses of funds already incurred and paid by the Company. Disbursements are Project-specific and subject to the achievement of various capital expenditure, facility development, production qualification, the receipt of applicable permits and other governmental approvals, and various other conditions.

Schedule II_ Valuation and Qual

Schedule II: Valuation and Qualifying Accounts	12 Months Ended
	Dec. 28, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II: Valuation and Qualifying Accounts	Schedule II: Valuation and Qualifying Accounts Years Ended December 28, 2024 December 30, 2023 December 31, (In thousands) Deferred tax asset, valuation allowance Beginning balance $ 576,998 $ 548,257 $ 521,620 Additions 22,934 49,481 41,782 Reductions (19,355) (20,740) (15,145) Ending balance $ 580,577 $ 576,998 $ 548,257 Allowance for credit losses Beginning balance $ 876 $ 1,422 $ 1,304 Additions 1,324 521 1,762 Write-offs (1,398) (473) (1,279) Recoveries during the period — (594) (365) Ending balance $ 802 $ 876 $ 1,422

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net loss	$ (150,338)	$ (25,213)	$ (76,043)

Award Timing Disclosure

Award Timing Disclosure	12 Months Ended
	Dec. 28, 2024
Award Timing Disclosures [Line Items]
Award Timing MNPI Disclosure	We do not grant stock options, stock appreciation rights (“SARs”), or similar option-like awards as part of our equity compensation programs. As such, none of our NEOs were awarded options, SARs or similar option-like awards during fiscal 2024. We have no policies or practices to disclose pursuant to Item 402(x)(1) of Regulation S-K.
Award Timing Method	We do not grant stock options, stock appreciation rights (“SARs”), or similar option-like awards as part of our equity compensation programs. As such, none of our NEOs were awarded options, SARs or similar option-like awards during fiscal 2024. We have no policies or practices to disclose pursuant to Item 402(x)(1) of Regulation S-K.
Award Timing Predetermined	false
Award Timing MNPI Considered	false
Award Timing, How MNPI Considered	We do not grant stock options, stock appreciation rights (“SARs”), or similar option-like awards as part of our equity compensation programs. As such, none of our NEOs were awarded options, SARs or similar option-like awards during fiscal 2024. We have no policies or practices to disclose pursuant to Item 402(x)(1) of Regulation S-K.
MNPI Disclosure Timed for Compensation Value	false

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 28, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 28, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 28, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Infinera has comprehensive and integrated enterprise risk management and cybersecurity risk management programs that use structured, proactive, and continuous processes to identify, understand, assess, mitigate, and report on enterprise and cybersecurity risks in alignment with business objectives. Our risk management program is used to guide and strengthen our cybersecurity posture to engender trust with customers, employees, and stockholders and to help protect the confidentiality, integrity, and availability of our systems and data. We have established a risk assessment methodology that includes requirements for treatment plans, risk acceptance thresholds, prioritization, and control analysis, as well as likelihood and impact analysis. A risk assessment is performed annually. Treatment plans are monitored and reported to management on a quarterly basis. Engaging Third Parties Companies, especially in the technology industry, have been subject to an increasing number of complex cybersecurity risks. Infinera has engaged with a range of external service providers, including consultants, auditors, and cybersecurity service providers, to help Infinera understand, manage, and mitigate cybersecurity risks. These engagements help Infinera drive improvements in its processes, identify new and emerging threats, and respond rapidly to the ever-evolving cybersecurity risk landscape. Third-Party Risk Management Infinera has implemented a robust third-party risk management program to identify and manage risks to the confidentiality, availability, and integrity of its systems and data. This includes contractual requirements related to data privacy and confidentiality, contractual commitments of third parties to maintain comprehensive security programs, and code of conduct requirements designed to ensure such third parties act ethically, responsibly, and safely. Infinera has also implemented processes to assess the effectiveness of third-party security programs and adherence to Infinera’s standards prior to engaging with a new service provider and to monitor performance on an ongoing basis. Cybersecurity Incident Response Infinera has implemented a cybersecurity incident response plan in line with industry standards. The plan defines roles and responsibilities regarding potential cybersecurity incidents, establishes processes regarding identification, containment, and eradication of, and recovery from, potential cybersecurity incidents and clarifies communication and notification policies regarding such potential cybersecurity incidents. The plan also captures lessons learned to drive continuous improvement. The plan is evaluated, tested, and enhanced through training, table-top exercises, and by engaging with third-party service providers. As of the date of this report, Infinera has not experienced any cybersecurity incidents it has determined to be material. For additional information regarding whether any risks from cybersecurity threats, including as a result of any previous cybersecurity incidents, have materially affected or are reasonably likely to materially affect our company, including our business strategy, results of operations, or financial condition, please refer to the section titled “Risk Factors” included in Part I, Item 1A of this Annual Report on Form 10-K.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Infinera has comprehensive and integrated enterprise risk management and cybersecurity risk management programs that use structured, proactive, and continuous processes to identify, understand, assess, mitigate, and report on enterprise and cybersecurity risks in alignment with business objectives. Our risk management program is used to guide and strengthen our cybersecurity posture to engender trust with customers, employees, and stockholders and to help protect the confidentiality, integrity, and availability of our systems and data
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Cybersecurity and risk management are shared responsibilities that apply to the Infinera team across all levels of the organization. • The Board of Directors conducts informed oversight of our risk management processes. The Audit Committee of the Board of Directors has primary responsibility for oversight of enterprise risk management and cybersecurity risk management. Reports on enterprise and cybersecurity risk, risk treatment plans, and key performance indicators of our cybersecurity program are provided to the Audit Committee by management, including our Chief Information Security Officer (CISO), on a quarterly basis and are provided to the Board of Directors as requested and as part of routine Audit Committee updates to the Board of Directors. • The Executive Leadership Team (ELT), a cross-functional leadership group that includes our Senior Vice President, Information Systems, is responsible for assessing and managing enterprise risks, including cybersecurity risks. The ELT reviews enterprise and cybersecurity risks, risk treatment plans, and key performance indicators regarding the Company’s enterprise risk and cybersecurity risk management programs quarterly. • The CISO is responsible for cybersecurity strategy and reporting on cybersecurity risks to the ELT, Audit Committee, and Board of Directors. The CISO collaborates with a cross-functional group of the Company’s business leaders to assess cybersecurity risk, establish and monitor cybersecurity processes, and report program effectiveness. Our CISO has over 25 years of cybersecurity and information technology experience across multiple industries with expertise in governance, risk and compliance, cybersecurity operations and cybersecurity engineering. • The Cybersecurity Advisory Committee supports cybersecurity risk assessment, advises on program enhancements, and acts as a cybersecurity advocate across the business. The committee is comprised of employees with extensive experience across a diverse range of disciplines. • All employees are responsible for adherence to the Company’s cybersecurity processes and for remaining vigilant to potential cybersecurity threats. This responsibility is part of our employee commitment to operational excellence and is strengthened by ongoing cybersecurity education, training, and awareness programs.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Board of Directors conducts informed oversight of our risk management processes. The Audit Committee of the Board of Directors has primary responsibility for oversight of enterprise risk management and cybersecurity risk management. Reports on enterprise and cybersecurity risk, risk treatment plans, and key performance indicators of our cybersecurity program are provided to the Audit Committee by management, including our Chief Information Security Officer (CISO), on a quarterly basis and are provided to the Board of Directors as requested and as part of routine Audit Committee updates to the Board of Directors.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Cybersecurity and risk management are shared responsibilities that apply to the Infinera team across all levels of the organization. • The Board of Directors conducts informed oversight of our risk management processes. The Audit Committee of the Board of Directors has primary responsibility for oversight of enterprise risk management and cybersecurity risk management. Reports on enterprise and cybersecurity risk, risk treatment plans, and key performance indicators of our cybersecurity program are provided to the Audit Committee by management, including our Chief Information Security Officer (CISO), on a quarterly basis and are provided to the Board of Directors as requested and as part of routine Audit Committee updates to the Board of Directors. • The Executive Leadership Team (ELT), a cross-functional leadership group that includes our Senior Vice President, Information Systems, is responsible for assessing and managing enterprise risks, including cybersecurity risks. The ELT reviews enterprise and cybersecurity risks, risk treatment plans, and key performance indicators regarding the Company’s enterprise risk and cybersecurity risk management programs quarterly. • The CISO is responsible for cybersecurity strategy and reporting on cybersecurity risks to the ELT, Audit Committee, and Board of Directors. The CISO collaborates with a cross-functional group of the Company’s business leaders to assess cybersecurity risk, establish and monitor cybersecurity processes, and report program effectiveness. Our CISO has over 25 years of cybersecurity and information technology experience across multiple industries with expertise in governance, risk and compliance, cybersecurity operations and cybersecurity engineering. • The Cybersecurity Advisory Committee supports cybersecurity risk assessment, advises on program enhancements, and acts as a cybersecurity advocate across the business. The committee is comprised of employees with extensive experience across a diverse range of disciplines. • All employees are responsible for adherence to the Company’s cybersecurity processes and for remaining vigilant to potential cybersecurity threats. This responsibility is part of our employee commitment to operational excellence and is strengthened by ongoing cybersecurity education, training, and awareness programs.
Cybersecurity Risk Role of Management [Text Block]	Cybersecurity and risk management are shared responsibilities that apply to the Infinera team across all levels of the organization. • The Board of Directors conducts informed oversight of our risk management processes. The Audit Committee of the Board of Directors has primary responsibility for oversight of enterprise risk management and cybersecurity risk management. Reports on enterprise and cybersecurity risk, risk treatment plans, and key performance indicators of our cybersecurity program are provided to the Audit Committee by management, including our Chief Information Security Officer (CISO), on a quarterly basis and are provided to the Board of Directors as requested and as part of routine Audit Committee updates to the Board of Directors. • The Executive Leadership Team (ELT), a cross-functional leadership group that includes our Senior Vice President, Information Systems, is responsible for assessing and managing enterprise risks, including cybersecurity risks. The ELT reviews enterprise and cybersecurity risks, risk treatment plans, and key performance indicators regarding the Company’s enterprise risk and cybersecurity risk management programs quarterly. • The CISO is responsible for cybersecurity strategy and reporting on cybersecurity risks to the ELT, Audit Committee, and Board of Directors. The CISO collaborates with a cross-functional group of the Company’s business leaders to assess cybersecurity risk, establish and monitor cybersecurity processes, and report program effectiveness. Our CISO has over 25 years of cybersecurity and information technology experience across multiple industries with expertise in governance, risk and compliance, cybersecurity operations and cybersecurity engineering. • The Cybersecurity Advisory Committee supports cybersecurity risk assessment, advises on program enhancements, and acts as a cybersecurity advocate across the business. The committee is comprised of employees with extensive experience across a diverse range of disciplines. • All employees are responsible for adherence to the Company’s cybersecurity processes and for remaining vigilant to potential cybersecurity threats. This responsibility is part of our employee commitment to operational excellence and is strengthened by ongoing cybersecurity education, training, and awareness programs.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Executive Leadership Team (ELT), a cross-functional leadership group that includes our Senior Vice President, Information Systems, is responsible for assessing and managing enterprise risks, including cybersecurity risks. The ELT reviews enterprise and cybersecurity risks, risk treatment plans, and key performance indicators regarding the Company’s enterprise risk and cybersecurity risk management programs quarterly.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our CISO has over 25 years of cybersecurity and information technology experience across multiple industries with expertise in governance, risk and compliance, cybersecurity operations and cybersecurity engineering.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The CISO is responsible for cybersecurity strategy and reporting on cybersecurity risks to the ELT, Audit Committee, and Board of Directors.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 28, 2024
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates, assumptions and judgments that can affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the consolidated financial statements, as well as the reported amounts of revenue and expenses during the reporting periods. Estimates, assumptions and judgements made by management include inventory valuation, revenue recognition, accounting for income taxes, stock-based compensation, employee benefit and pension plans, manufacturing partner and supplier liabilities, allowances for sales returns, allowances for credit losses, useful life of intangibles and property, plant and equipment, impairment loss related to lease abandonment, accrued warranty, operating and finance lease liabilities, restructuring and other related costs and loss contingencies. The Company bases its assumptions on historical experience and also on assumptions that it believes are reasonable. Actual results could differ materially from those estimates. These estimates may change as new events occur and additional information emerges, and such changes are recognized or disclosed in the Company's consolidated financial statements.
Revenue Recognition	Revenue Recognition The Company recognizes revenue when control of the promised goods or services is transferred to its customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company determines revenue recognition by applying the following five-step approach: • identification of the contract, or contracts, with a customer; • identification of the performance obligations in the contract; • determination of the transaction price; • allocation of the transaction price to the performance obligations in the contract; and • recognition of revenue when, or as, the Company satisfies a performance obligation. Many of the Company's product sales are sold in combination with installation and deployment services along with initial hardware and software support. The Company's product sales are also sold at times with spares management, on-site hardware replacement services, network operations management, software subscription services, extended hardware warranty and training. Initial software and hardware support services are generally delivered over a one-year period in connection with the initial purchase. Software warranty provides customers with maintenance releases during the warranty support period and hardware warranty provides replacement or repair of equipment that fails to perform in line with specifications. Software subscription services include software warranty and additionally provides customers with rights to receive unspecified software product upgrades released during the support period. Spares management and on-site hardware replacement services include the replacement of defective units at customer sites in accordance with specified service level agreements. Network operations management includes the day-to-day operation of a customer's network. These services are generally delivered on an annual basis. The Company evaluates each promised good and service in a contract to determine whether it represents a distinct performance obligation or should be accounted for as a combined performance obligation. Services revenue includes software subscription services, installation and deployment services, spares management, on-site hardware replacement services, network operations management, extended hardware warranty and training. Revenue from software subscription services, spares management, on-site hardware replacement services, network operations management and extended hardware warranty contracts is recognized ratably over the contractual support period, which is generally one year, as services are provided over the course of the entire period. Revenue related to training and installation and deployment services is recognized upon completion of the services. Contracts and customer purchase orders are generally used to determine the existence of an arrangement. In addition, shipping documents and customer acceptances, when applicable, are used to verify delivery and transfer of title. The Company typically satisfies its performance obligations upon shipment or delivery of product depending on the contractual terms. Payment terms to customers generally range from net 30 to 120 days from invoice, which are considered to be standard payment terms. The Company assesses its ability to collect from its customers based primarily on the creditworthiness and past payment history of the customer. For sales to resellers, the same revenue recognition criteria apply. It is the Company’s practice to identify an end-customer prior to shipment to a reseller. The Company does not offer refund rights, return rights, or price protection to its resellers. The Company reports revenue net of any required taxes collected from customers and remitted to government authorities, with the collected taxes recorded as current liabilities until remitted to the relevant government authority. Customer Purchase Commitments The Company sells software licenses that provide customers the ability to purchase incremental `bandwidth capacity on an already-deployed hardware. Infinera Instant Bandwidth-enabled systems generally include a specific initial capacity and incremental capacity can be added by the purchase of Instant Bandwidth licenses. Instant Bandwidth licenses are considered distinct performance obligations because customers can provision additional transmission capacity on demand without the deployment of any incremental equipment. Some contracts commit the customer to purchase incremental Instant Bandwidth licenses within a specified time frame from the initial shipment of the Instant Bandwidth-enabled hardware. The time frame varies by customer and generally ranges between 12 to 24 months. If the customer does not purchase the additional capacity within the time frame as stated in the contract, the Company has the right to deliver and invoice such Instant Bandwidth licenses to the customer. Future committed licenses are considered to be additional performance obligations when a minimum purchase obligation is present, as evidenced by enforceable rights and obligations. As such, the Company is required to estimate the variable consideration for future Instant Bandwidth licenses as part of determining the contract transaction price. Contract Termination Rights The contract term is determined on the basis of the period over which the parties to the contract have present enforceable rights and obligations. Certain customer contracts include a termination for convenience clause that allows the customer to terminate services without penalty, upon advance notification. For such contracts, the service duration is limited to the non-cancelable portion of the contract. Variable Consideration The consideration associated with customer contracts is generally fixed. Variable consideration includes discounts, rebates, refunds, credits, incentives, penalties, or other similar items. The amount of consideration that can vary is not a substantial portion of total consideration. Variable consideration estimates are re-assessed at each reporting period until a final outcome is determined. The changes to the original transaction price due to a change in estimated variable consideration will be applied on a retrospective basis, due to system constraints, with the adjustment recorded in the current period. Stand-alone Selling Price The Company allocates the transaction price for a contract among the performance obligations on a relative stand-alone selling price (SSP) basis. The SSP is the price at which an entity would sell a promised product or service separately to a customer. While certain services sold by the Company have readily observable SSPs, the majority of the Company's products and services are generally not sold on a stand-alone basis and therefore SSPs for such products and services are not directly observable. If there is no observable SSP, it is estimated using judgment and considering all reasonably available information including but not limited to, gross margin objectives, pricing practices in customer contracts with multiple goods and services, internal costs, historical profitability data, competitor pricing strategies, as well as other observable inputs. The determination of SSP for performance obligations is assessed on a periodic basis and estimates are revised to reflect any changes to underlying assumptions. Shipping and Handling The Company treats shipping and handling activities as costs to fulfill the Company's promise to transfer products. Shipping and handling fees billed to customers are recorded as a reduction to cost of product. Capitalization of Costs to Obtain a Contract The Company has assessed the treatment of costs to obtain or fulfill a contract with a customer. Under Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" ("ASC 606"), the Company expenses sales commissions as incurred with the exception of sales commissions related to multi-year service contracts, which are paid for upfront, capitalized, and amortized over the service period. Sales commissions paid on service contract renewals are commensurate with the sales commissions paid on the initial contracts. Transaction Price Allocated to the Remaining Performance Obligation The Company’s remaining performance obligations represent the transaction price allocated to performance obligations that are unsatisfied or partially satisfied as of period end, consisting of deferred revenue and non-cancellable backlog. The Company’s backlog represents purchase orders received from customers for future product shipments and services that are unsatisfied or partially satisfied as of period end. The Company’s backlog is subject to future events that could cause the amount or timing of the related revenue to change. Orders in backlog may be fulfilled several quarters following receipt or may relate to multi-year support service obligations.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period (generally the vesting period) under the straight-line amortization method. The Company accounts for forfeitures as they occur. The Company estimates the fair value of the rights to acquire stock under its 2007 Employee Stock Purchase Plan (the “ESPP”) using the Black-Scholes option pricing formula. The ESPP, which was indefinitely suspended effective upon the expiration of the offering period that ended August 15, 2023, provides for consecutive six-month offering periods. The Company accounts for the fair value of restricted stock units (“RSUs”) using the closing market price of the Company’s common stock on the date of grant. RSUs typically vest ratably over a service period ranging from one Outstanding Performance Stock Units ("PSUs") granted to the Company's executive officers, senior management and certain other employees in 2023 and prior fiscal years are based on performance criteria related to specific financial or operational targets over the span of a two PSUs granted to the Company's executive officers and senior management during 2024 are based on the Company's total shareholder return ("TSR") as compared to an index of peer companies. The Company estimates the fair value of performance based awards subject to TSR as compared to an index of peer companies using a Monte Carlo simulation valuation model on the date of grant and recognizes the related stock-based compensation expense over the performance period. The Company reverses stock-based compensation expense on performance based awards subject to TSR only when the requisite service period is not reached. The number of shares to be issued upon vesting of these PSUs range from 0 to 2.0 times the target number of PSUs granted.
Employee Benefit and Pension Plans	Employee Benefit and Pension Plans The Company operates a number of post-employment plans in Germany, as well as smaller post-employment plans in other countries, including both defined contribution and defined benefit plans. Benefit cost and obligations pertaining to these plans are based on assumptions for the discount rate, expected return on plan assets, mortality rates, expected salary increases, health care cost trend rates and attrition rates. The discount rate assumption is based on current investment yields of high-quality fixed-income securities with maturities similar to the expected benefits payment period. Mortality rates help predict the expected life of plan participants. The expected increase in the compensation levels assumption reflects the Company's actual experience and future expectations. The expected long-term return on plan assets is determined based on asset allocations, historical portfolio results, historical asset correlations and management’s expected returns for each asset class. The Company evaluates its expected return assumptions annually including reviewing current capital market assumptions to assess the reasonableness of the expected long-term return on plan assets. The Company updates the expected long-term return on assets when the Company observes a sufficient level of evidence that would suggest the long-term expected return has changed.
Research and Development	Research and Development All costs to develop the Company’s hardware products are expensed as incurred. Software development costs are capitalized beginning when a product’s technological feasibility has been established and ending when a product is available for general release to customers. Generally, the Company’s software products are released soon after technological feasibility has been established. As a result, costs subsequent to achieving technological feasibility have not been significant and all software development costs have been expensed as incurred.
Advertising	Advertising
Accounting for Income Taxes	Accounting for Income Taxes As part of the process of preparing its consolidated financial statements, the Company is required to estimate its taxes in each of the jurisdictions in which it operates. This involves calculating current tax expense and recognizing differences in timing for deductible transactions, leading to deferred tax assets and liabilities on its balance sheet. Deferred tax assets are future tax benefits the Company expects to receive when certain expenses become deductible or when tax attributes are used. The realization of these assets depends on future taxable income in the relevant areas where these deductions, losses, and credits can be applied. The Company must assess the likelihood that some portion or all of its deferred tax assets will be recovered from future taxable income within the respective jurisdictions, and to the extent the Company believes that recovery does not meet the “more-likely-than-not” standard, it must establish a valuation allowance. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management judgment is required in determining its provision for income taxes, its deferred tax assets and liabilities and any valuation allowance recorded against our net deferred tax assets. In evaluating the need for a full or partial valuation allowance, all positive and negative evidence must be considered, including considering all sources of income, its current financial performance, its market environment, and other factors. Based on the available objective evidence, at December 28, 2024, management believes it is more likely than not that the net deferred tax assets in the U.S., state, and certain foreign jurisdictions will not be realizable in the foreseeable future. Accordingly, the Company has recorded a valuation allowance against these deferred tax assets. The Company will continue to assess its realizability of deferred tax assets on a quarterly basis. To the extent that the Company determines that deferred tax assets are realizable on a more likely than not basis in the future, and an adjustment is needed, that adjustment will be recorded in the period that the determination is made.
Foreign Currency Translation and Transactions	Foreign Currency Translation and Transactions The Company considers the functional currencies of its foreign subsidiaries to be the local currency. Assets and liabilities recorded in foreign currencies are translated at the exchange rate as of the balance sheet date, revenue, costs and expenses are translated at average exchange rates in effect during the period. Equity transactions are translated using historical exchange rates. The effects of foreign currency translation adjustments are recorded as a separate component of accumulated other comprehensive income (loss) in the accompanying consolidated balance sheets and consolidated statements of comprehensive loss. For all non-functional currency account balances, the re-measurement of such balances to the functional currency will result in either a foreign exchange transaction gain or loss, which is recorded to other income (loss), net, in the Company's consolidated statement of operations, in the same period that the re-measurement occurred. Aggregate foreign exchange transactions recorded resulted in a loss of $22.0 million in 2024, gain of $14.8 million in 2023, and gain of $12.8 million in 2022.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash consists primarily of cash in bank deposit accounts which, at times, a portion may exceed federally insured limits. The Company has not experienced any losses in such accounts. The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents.
Fair Value Measurement	Fair Value Measurement Pursuant to the accounting guidance for fair value measurements and its subsequent updates, fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability. Valuation techniques used by the Company are based upon observable and unobservable inputs. Observable or market inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions about market participant assumptions based on the best information available. Observable inputs are the preferred source of values. These two types of inputs create the following fair value hierarchy: Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 2 – Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 – Prices or valuations that require management inputs that are both significant to the fair value measurement and unobservable. The Company measures its cash equivalents and debt securities at fair value and classifies them in accordance with the fair value hierarchy on a recurring basis. Facilities-related Charges The Company classifies certain facilities-related charges within Level 3 of the fair value hierarchy and applies fair value accounting on a nonrecurring basis when impairment indicators exist or upon the existence of observable fair values. The impairment charges incurred for operating lease right-of-use assets are calculated at fair value based on the estimated future sublease rental receipts that the Company can reasonably obtain over the remaining lease term at the discount rate. These charges are classified as Level 3 measurement due to the significance of these unobservable inputs.
Accounts Receivable and Allowances for Credit Losses	Accounts Receivable and Allowances for Credit Losses Accounts receivable are recorded at the invoiced amount and do not bear interest. The Company maintains an allowance for estimated credit losses resulting from the inability of its customers to make required payments and reviewed the allowance quarterly. The Company determines expected credit losses by performing credit evaluations of its customers' financial condition, establishing both an estimated reserve and a specific reserve for customers in adverse financial condition and adjusting for its expectations of changes in conditions that may impact the collectability of outstanding receivables. The Company considers a customer's receivable balance past due when the amount is due beyond the credit terms extended, The Company considers factors such as historical experience, credit quality, age of the accounts receivable balances, current economic trends, reasonable and supportable forecasts and geographic or country-specific risks. Amounts are written off when receivables are determined to be uncollectible.
Allowances for Sales Returns	Allowances for Sales Returns
Concentration of Risk	Concentration of Risk Financial instruments that are potentially subject to concentrations of credit risk consist primarily of cash, cash equivalents and restricted cash and accounts receivable. The risk with respect to accounts receivable is mitigated by ongoing credit evaluations that the Company performs on its customers. As the Company continues to expand its sales internationally, it may experience increased levels of customer credit risk associated with those regions. Collateral is generally not required for accounts receivable but may be used in the future to mitigate credit risk associated with customers located in certain geographical regions. One customer accounted for 11% of the Company's accounts receivable balance, net on the consolidated balance sheets as of December 28, 2024. No customer accounted for 10% or more of the Company's accounts receivable balance, net on the consolidated balance sheets as of December 30, 2023. One end-customer accounted for 12% of the Company's revenue in fiscal year 2024. One end-customer accounted for 10% of the Company's revenue in fiscal year 2023 and one end-customer accounted for 11% of the Company's revenue in fiscal year 2022. The Company depends on sole source or limited source suppliers for several key components and raw materials. The Company generally purchases these sole source or limited source components and raw materials through standard purchase orders and does not have long-term contracts with many of these limited-source suppliers. While the Company seeks to maintain sufficient reserve stock of such components and raw materials, the Company’s business and results of operations could be adversely affected if any of its sole source or limited source suppliers suffer from capacity constraints, lower than expected yields, deployment delays, work stoppages or any other reduction or disruption in output.
Derivative Instruments	Derivative Instruments From time to time, the Company has entered into factoring agreements to sell certain receivables to unrelated third-party financial institutions. These transactions are accounted for in accordance with ASC 860, Transfers and Servicing (“ASC 860”). ASC 860 and result in a reduction in accounts receivable because the agreements transfer effective control over and risk related to the receivables to the buyers. The Company's factoring agreements do not allow for recourse in the event of uncollectability, and the Company does not retain any interest in the underlying accounts receivable once sold.
Inventory Valuation	Inventory Valuation Inventories consist of raw materials, work-in-process and finished goods and are stated at standard cost adjusted to approximate the lower of actual cost or net realizable value. Costs are recognized utilizing the first-in, first-out method. Net realizable value is based upon an estimated selling price reduced by the estimated cost of disposal. The determination of market value involves numerous judgments including estimated average selling prices based upon recent sales volumes, industry trends, existing customer orders, current contract price, future demand and pricing and technological obsolescence of the Company’s products. Inventory that is obsolete or in excess of the Company’s forecasted demand or is anticipated to be sold at a loss is written down to its estimated net realizable value based on historical usage and expected demand. In valuing its inventory costs and deferred inventory costs, the Company considered whether the net realizable value of inventory delivered or expected to be delivered at less than cost, primarily comprised of common equipment, had declined. The Company concluded that, in the instances where the net realizable value of inventory delivered or expected to be delivered was less than cost, it was appropriate to value the inventory costs and deferred inventory costs at cost or net realizable value, whichever is lower, thereby recognizing the cost of the reduction in net realizable value of inventory in the period in which the reduction occurred or can be reasonably estimated. The Company has, therefore, recognized inventory write-downs as necessary in each period in order to reflect inventory at the lower of actual cost or net realizable value. The Company considers whether it should accrue losses on firm purchase commitments related to inventory items. Given that the net realizable value of common equipment is below contractual purchase price, the Company has also recorded losses on these firm purchase commitments in the period in which the commitment is made. When the inventory parts related to these firm purchase commitments are received, that inventory is recorded at the purchase price less the accrual for the loss on the purchase commitment.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are stated at cost less accumulated depreciation. This includes enterprise-level business software that the Company customizes to meet its specific operational needs and certain software licenses. Depreciation is calculated using the straight-line method over the estimated useful lives of the respective assets. Leasehold improvements are amortized using the straight-line method over the shorter of the lease term or estimated useful life of the asset. An assumption of lease renewal where a renewal option exists is used only when the renewal has been determined to be reasonably certain. Repair and maintenance costs are expensed as incurred. The estimated useful life for each asset category is as follows: Estimated Useful Lives Building 20 years Laboratory and manufacturing equipment 1.5 to 10 years Furniture and fixtures 3 to 5 years Computer hardware 3 to 5 years Computer software 3 years Leasehold and building improvements 1 to 24 years The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of these assets may not be recoverable or that the useful life is shorter than originally estimated. If impairment indicators are present and the projected future undiscounted cash flows are less than the carrying value of the assets, the carrying values are reduced to the estimated fair value. If assets are determined to be recoverable, but the useful lives are shorter than originally estimated, the carrying value of the assets is depreciated over the newly determined remaining useful lives.
Accrued Warranty	Accrued Warranty In the Company's contracts with its customers, the Company warrants that its products will operate substantially in conformity with product specifications. Hardware warranties provide the purchaser with protection in the event that the product does not perform to product specifications. During the warranty period, the purchaser’s sole and exclusive remedy in the event of such defect or failure to perform is limited to the correction of the defect or failure by repair, refurbishment or replacement, at the Company’s sole option and expense. The Company's hardware warranty periods generally range from one
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill represents the excess of the purchase price of an acquired business over the fair value of the identifiable assets acquired and liabilities assumed. The Company tests for impairment of goodwill on an annual basis in the fourth quarter and at any other time when events occur or circumstances indicate that the carrying amount of goodwill may not be recoverable. The Company has the option to first assess qualitative factors to determine whether it is necessary to perform the quantitative goodwill impairment test. If the Company determines that as a result of the qualitative assessment that it is more likely than not (i.e., greater than 50% likelihood) that the fair value of a reporting unit is less than its carrying amount, then the quantitative test is required or it can directly perform the quantitative analysis. The Company recognizes an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized does not exceed the total amount of goodwill allocated to that reporting unit. The Company completed its annual qualitative impairment test of goodwill as of the first day of the fourth fiscal quarter of 2024, or September 29, 2024, and determined that it was not more likely than not that the fair value of the reporting unit is less than its carrying amount. As a result, it was determined that it was not necessary for the Company to perform a quantitative goodwill impairment test for the year ended December 28, 2024. The Company evaluates events and changes in circumstances that could indicate carrying amounts of purchased intangible assets with finite lives may not be recoverable. When such events or changes in circumstances occur, the Company assesses the recoverability of these assets by determining whether or not the carrying amount will be recovered through undiscounted expected future cash flows. If the total of the future undiscounted cash flows is less than the carrying amount of an asset, the Company records an impairment loss for the amount by which the carrying amount of the asset exceeds the fair value of the asset. Intangible assets with finite lives are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets.
Leases	Leases The Company has operating leases primarily for real estate (facilities) and automobiles. The Company has finance leases primarily for computer hardware, laboratory and manufacturing equipment and leasehold and building improvements. The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one The Company determines if an arrangement contains a lease at inception. Operating leases are included in operating lease right-of-use ("ROU") assets, accrued expenses and other current liabilities and operating lease liabilities on the Company's consolidated balance sheets. Finance leases are included in property, plant and equipment, net, accrued expenses and other current liabilities and other long-term liabilities on the Company's consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. Operating lease ROU assets also include any lease payments made and exclude lease incentives and initial direct costs incurred. Variable lease payments are expensed as incurred and are not included within the ROU asset and lease liability calculation. Variable lease payments primarily include reimbursements of costs incurred by lessors for common area maintenance and utilities. The Company's lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company rents or subleases certain real estate under agreements that are classified as operating leases. Leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company does not account for lease components (e.g., fixed payments including rent) separately from the non-lease components (e.g., common-area maintenance costs). Upon abandoning or committing to a plan to abandon a leased property in the short term before the lease term expires, the Company assesses the fair value of its remaining obligation under the lease and records an impairment of the ROU asset, if needed. The impairment loss is calculated as the present value of the amount by which the remaining lease obligation, adjusted for the effects of any one-time costs to sublease, exceeds the estimated sublease rentals that could be reasonably obtained. The estimated sublease rentals consider Company's ability and intent to sublease the space. The significant assumptions used in the Company's discounted cash flow model include the amount and timing of estimated sublease rental receipts and the discount rate which involve a number of risks and uncertainties, some of which are beyond control, including future real estate market conditions and the Company's ability to successfully enter into subleases or termination agreements with terms as favorable as those assumed when arriving at its estimates. The Company monitors these estimates and assumptions on at least a quarterly basis for changes in circumstances and any corresponding adjustments to the accrual are recorded in its statement of operations in the period when such changes are known. The loss recorded or to be recorded may change significantly as a result of the re-measurement of the liability, if the timing or amount of estimated cash flows change.
Restructuring and Other Related Costs	Restructuring and Other Related Costs The Company records costs associated with exit activities related to restructuring plans in accordance with ASC 420, Exit or Disposal Cost Obligations , or ASC 712, Compensation — Nonretirement Postemployment Benefits . Liabilities for costs associated with an exit or disposal activity are recognized in the period in which the liability is incurred. The timing of the associated cash payments is dependent upon the type of exit cost. The Company records restructuring cost liabilities in “accrued expenses and other current liabilities” and "other long-term liabilities" in the consolidated balance sheet. Restructuring costs include employee and contract termination costs, facility consolidation and closure costs, lease related impairment charges, equipment write-downs and inventory write-downs. One-time termination benefits are recognized as a liability at estimated fair value when the approved plan of termination has been communicated to employees, unless employees must provide future service, in which case the benefits are recognized ratably over the future service period. Ongoing termination benefits arrangements are recognized as a liability at estimated fair value when the amount of such benefits becomes estimable and payment is probable. Restructuring charges require significant estimates and assumptions, including estimates made for employee separation costs and other contract termination charges. Management estimates involve a number of risks and uncertainties, some of which are beyond control, including the Company's ability to successfully enter into termination agreements with employees and others with terms as favorable as those assumed when arriving at its estimates. The Company monitors these estimates and assumptions on at least a quarterly basis for changes in circumstances and any corresponding adjustments to the accrual are recorded in its statement of operations in the period when such changes are known.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Pronouncements Recently Adopted Segment Reporting Disclosures In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard improves reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit (referred to as the “significant expense principle”). The standard will become effective for fiscal year 2024 annual financial statements and interim financial statements thereafter and will be applied retrospectively for all prior periods presented in the financial statements, with early adoption permitted. The Company adopted the standard when it became effective beginning in fiscal year 2024 annual financial statements. See Note 16 Segment Information in the accompanying notes to the consolidated financial statements for further detail. Accounting Pronouncements Not Yet Adopted Induced Conversions of Convertible Debt Instruments In November 2024, the FASB issued ASU 2024-04, "Debt-Debt with Conversion and Other Options (Subtopic 470-20): Induced Conversions of Convertible Debt Instruments". This standard clarifies the requirements for determining whether certain settlements of convertible debt instruments should be accounted for as an induced conversion. The new guidance is effective for annual reporting periods beginning after December 15, 2025, and interim periods within those annual periods. We are currently evaluating the potential impact of adopting ASU 2024-04. Disaggregation of Income Statement Expense In November 2024, the FASB issued ASU 2024-03, "Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses." This standard requires disaggregation of certain expense captions into specified categories in disclosures within the footnotes to the financial statements. The standard is effective for annual periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027; with early adoption permitted. ASU 2024-03 allows for adoption using either a prospective or retrospective method. The Company is currently evaluating the impact of this standard on its consolidated financial statements and related disclosures. Codification Improvements In March 2024, the FASB issued ASU 2024-02, "Codification Improvements - Amendments to Remove References to the Concepts Statements." This standard amends the FASB Accounting Standards Codification (the "Codification") that remove references to various FASB Concept Statements and impact a variety of topics in the Codification. For public business entities, the standard will be effective for annual periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact of this standard on its consolidated financial statements and disclosures. Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The standard enhances income tax disclosure requirements for all entities by requiring specified categories and greater disaggregation within the rate reconciliation table, disclosure of income taxes paid by jurisdiction, and providing clarification on uncertain tax positions and related financial statement impacts. For public business entities, the standard will be effective for annual periods beginning after December 15, 2024 with early adoption permitted. The Company plans to adopt the standard when it becomes effective beginning in fiscal year 2025, and expects the adoption of the standard will impact certain income tax disclosures in the annual financial statements.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 28, 2024
Accounting Policies [Abstract]
Schedule of Estimated Useful Life of Asset	The estimated useful life for each asset category is as follows: Estimated Useful Lives Building 20 years Laboratory and manufacturing equipment 1.5 to 10 years Furniture and fixtures 3 to 5 years Computer hardware 3 to 5 years Computer software 3 years Leasehold and building improvements 1 to 24 years

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 28, 2024
Leases [Abstract]
Schedule of Assets And Liabilities, Lessee	The following table presents current and long-term portion of operating lease liabilities as classified in the consolidated balance sheets (in thousands): December 28, 2024 December 30, 2023 Accrued expenses and other current liabilities $ 11,948 $ 11,888 Long-term operating lease liabilities 41,601 47,464 Total operating lease liability $ 53,549 $ 59,352
Schedule of Finance Lease Liability	The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of December 28, 2024 (in thousands): Operating Lease Finance Lease Total lease payments (1) $ 101,466 $ 4,619 Less: interest (2) 47,917 387 Present value of lease liabilities $ 53,549 $ 4,232 (1) Refer to Note 12, “Commitments and Contingencies" to the notes to consolidated financial statements for the future minimum lease payments as of December 28, 2024. (2) Calculated using the interest rate for each lease. The following table sets forth commitments and contingencies related to our various obligations (in thousands): Payments Due by Period Total 2025 2026 2027 2028 2029 Thereafter Operating leases (1)(2) $ 101,466 $ 15,679 $ 12,906 $ 11,405 $ 7,035 $ 3,155 $ 51,286 Financing lease obligations (3) 4,619 1,861 997 951 810 — — Purchase obligations (4) 376,266 364,224 12,042 — — — — 2028 Notes, including interest (5) 544,813 17,766 17,766 17,766 491,515 — — 2027 Notes, including interest (5) 212,500 5,000 5,000 202,500 — — — Mortgage Payable, including interest (5) 8,105 945 945 945 945 4,325 — Total contractual obligations $ 1,247,769 $ 405,475 $ 49,656 $ 233,567 $ 500,305 $ 7,480 $ 51,286 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $6.1 million and $4.6 million as of December 28, 2024 and December 30, 2023, respectively. As of December 28, 2024, $6.1 million is classified as other long-term liabilities on the accompanying consolidated balance sheets. (3) The Company has finance leases for computer hardware and leasehold improvements. The above payment schedule includes interest. See Note 3, "Leases" to the notes to consolidated financial statements for more information. (4) The Company has agreements with its major production suppliers, where the Company is committed to purchase certain parts. As of December 28, 2024, December 30, 2023 and December 31, 2022, these non-cancelable purchase commitments were $376.3 million, $466.3 million and $744.8 million, respectively. (5)
Schedule of Operating Lease Liabilities	The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of December 28, 2024 (in thousands): Operating Lease Finance Lease Total lease payments (1) $ 101,466 $ 4,619 Less: interest (2) 47,917 387 Present value of lease liabilities $ 53,549 $ 4,232 (1) Refer to Note 12, “Commitments and Contingencies" to the notes to consolidated financial statements for the future minimum lease payments as of December 28, 2024. (2) Calculated using the interest rate for each lease. The following table sets forth commitments and contingencies related to our various obligations (in thousands): Payments Due by Period Total 2025 2026 2027 2028 2029 Thereafter Operating leases (1)(2) $ 101,466 $ 15,679 $ 12,906 $ 11,405 $ 7,035 $ 3,155 $ 51,286 Financing lease obligations (3) 4,619 1,861 997 951 810 — — Purchase obligations (4) 376,266 364,224 12,042 — — — — 2028 Notes, including interest (5) 544,813 17,766 17,766 17,766 491,515 — — 2027 Notes, including interest (5) 212,500 5,000 5,000 202,500 — — — Mortgage Payable, including interest (5) 8,105 945 945 945 945 4,325 — Total contractual obligations $ 1,247,769 $ 405,475 $ 49,656 $ 233,567 $ 500,305 $ 7,480 $ 51,286 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $6.1 million and $4.6 million as of December 28, 2024 and December 30, 2023, respectively. As of December 28, 2024, $6.1 million is classified as other long-term liabilities on the accompanying consolidated balance sheets. (3) The Company has finance leases for computer hardware and leasehold improvements. The above payment schedule includes interest. See Note 3, "Leases" to the notes to consolidated financial statements for more information. (4) The Company has agreements with its major production suppliers, where the Company is committed to purchase certain parts. As of December 28, 2024, December 30, 2023 and December 31, 2022, these non-cancelable purchase commitments were $376.3 million, $466.3 million and $744.8 million, respectively. (5)
Schedule of Lease Costs	The following table presents supplemental information for the Company's non-cancelable leases for the fiscal year ended December 28, 2024 (in thousands, except for weighted average and percentage data): Operating Lease Finance Lease Weighted average remaining lease term 15.18 years 3.31 years Weighted average discount rate 10.71 % 10.00 % Cash paid for amounts included in the measurement of lease liabilities $ 16,889 $ 562 Leased assets obtained in exchange for new lease liabilities $ 6,529 $ —

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 28, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table presents the Company's revenue disaggregated by revenue source (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Product $ 1,103,131 $ 1,304,229 $ 1,268,624 Services 315,315 309,899 304,618 Total revenue $ 1,418,446 $ 1,614,128 $ 1,573,242 The Company sells its products directly to customers who are predominantly service providers and to channel partners that sell on its behalf. The following tables present the Company's revenue disaggregated by geography, based on the shipping address of the end-customer and by sales channel (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 United States $ 834,472 $ 994,311 $ 870,282 Other Americas 80,260 99,920 101,600 Europe, Middle East and Africa 364,581 359,201 405,328 Asia Pacific 139,133 160,696 196,032 Total revenue $ 1,418,446 $ 1,614,128 $ 1,573,242 Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Direct $ 900,421 $ 1,067,570 $ 1,191,584 Indirect 518,025 546,558 381,658 Total revenue $ 1,418,446 $ 1,614,128 $ 1,573,242
Schedule of Contract with Customer, Asset and Liability	The following table provides information about receivables, contract assets, contract liabilities and deferred revenue from contracts with customers (in thousands): Assets (Liabilities) December 28, 2024 December 30, 2023 Accounts receivable, net $ 336,552 $ 381,981 Contract assets (1) $ 60,039 $ 46,738 Contract liabilities (2) $ (25,350) $ (3,313) Deferred revenue (3) $ (164,017) $ (157,580) (1) Contract assets are included in prepaid and other current assets line in the consolidated balance sheet. (2) Included in this balance are deposits, customer advances and variable rebates and incentives. (3) Included in this balance are amounts related to services that are subject to cancellation and pro-rated refund rights of $55.1 million and $85.9 million as of December 28, 2024 and December 30, 2023, respectively.
Schedule of Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially satisfied) pursuant to contracts that are not subject to cancellation without penalty at the end of the reporting period (in thousands): 2025 2026 2027 2028 2029 Thereafter Total Revenue expected to be recognized in the future as of December 28, 2024 $ 392,383 $ 115,506 $ 52,717 $ 20,735 $ 11,728 $ 4,676 $ 597,745

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 28, 2024
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table presents the estimated fair values of the convertible senior notes (in thousands): As of December 28, 2024 As of December 30, 2023 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Convertible senior notes (1) $ — $ 764,971 $ 764,971 $ — $ 658,609 $ 658,609 (1) Consists of 2027 Notes and 2028 Notes as of December 28, 2024 as the Company repaid the remaining principal balance of the 2024 Notes during the quarter ended September 28, 2024. Refer to Note 11, “Debt” to the notes to consolidated financial statements for more information. Cash equivalents are measured and reported at fair value on a recurring basis. The following table presents the fair value of these financial assets and their levels within the fair value hierarchy (in thousands): As of December 28, 2024 As of December 30, 2023 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Money market funds $ 65,000 $ — $ 65,000 $ 115,000 $ — $ 115,000

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 28, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table presents details of the Company’s goodwill for the fiscal year ended December 28, 2024 (in thousands): Balance as of December 30, 2023 $ 240,566 Foreign currency translation adjustments (16,333) Balance as of December 28, 2024 $ 224,233
Schedule of Finite-Lived Intangible Assets	The following tables present details of the Company’s intangible assets with finite life as of December 28, 2024 and December 30, 2023 (in thousands, except for remaining useful life): December 28, 2024 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Remaining Useful Life (In Years) Intangible assets with finite lives: Customer relationships 72,200 (56,406) 15,794 1.8 Total intangible assets with finite lives $ 72,200 $ (56,406) $ 15,794 December 30, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Remaining Useful Life (In Years) Intangible assets with finite lives: Customer relationships and backlog 72,200 (47,381) 24,819 2.8 Total intangible assets with finite lives $ 72,200 $ (47,381) $ 24,819
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table summarizes the Company’s estimated future amortization expense of intangible assets with finite life as of December 28, 2024 (in thousands): Total 2025 2026 2027 2028 2029 Thereafter Total future amortization expense $ 15,794 $ 9,025 $ 6,769 $ — $ — $ — $ —

Balance Sheet Details (Tables)

Balance Sheet Details (Tables)	12 Months Ended
	Dec. 28, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Allowance for Doubtful Accounts	The following table provides a rollforward of the allowance for credit losses for accounts receivable for the fiscal year ended December 28, 2024 (in thousands): Balance as of December 30, 2023 $ 876 Additions (1) 1,324 Write offs (2) (1,398) Balance as of December 28, 2024 $ 802 (1) The new additions during the fiscal year ended December 28, 2024 are primarily estimated reserves. (2) The write offs during the fiscal year ended December 28, 2024 are primarily for amounts that were previously reserved.
Schedule of Details of Selected Balance Sheet Items	The following table provides details of selected balance sheet items (in thousands): December 28, 2024 December 30, 2023 Inventory Raw materials $ 69,687 $ 133,561 Work in process 67,949 68,407 Finished goods 170,577 229,195 Total $ 308,213 $ 431,163 Property, plant and equipment, net Computer hardware $ 48,459 $ 48,611 Computer software (1) 71,954 74,752 Laboratory and manufacturing equipment 380,417 354,103 Land and building 12,372 12,372 Furniture and fixtures 3,177 2,916 Leasehold and building improvements 46,544 46,652 Construction in progress 97,075 41,328 Subtotal $ 659,998 $ 580,734 Less accumulated depreciation (2) (410,502) (373,737) Total $ 249,496 $ 206,997 Accrued expenses and other current liabilities Loss contingency related to non-cancelable purchase commitments $ 28,242 $ 17,909 Taxes payable 15,292 24,248 Restructuring accrual 1,237 6,042 Short-term operating and finance lease liability 13,594 12,905 Customer contract liabilities (3) 25,350 3,313 Other accrued expenses and other current liabilities 59,670 46,341 Total accrued expenses and other current liabilities $ 143,385 $ 110,758 (1) Included in computer software at December 28, 2024 and December 30, 2023 were $33.5 million and $34.8 million, respectively, related to enterprise resource planning (“ERP”) systems that the Company implemented in prior years. The unamortized ERP costs at December 28, 2024 and December 30, 2023 were $5.4 million and $9.6 million, respectively. Also included in computer software at December 28, 2024 and December 30, 2023 was $27.2 million and $29.6 million, respectively, related to term licenses. The unamortized term license costs at December 28, 2024 and December 30, 2023 was $14.0 million and $23.6 million, respectively. (2) Depreciation expense was $52.9 million, $55.8 million and $46.1 million (which includes depreciation of capitalized ERP costs of $4.8 million, $4.9 million and $3.5 million) for 2024, 2023 and 2022, respectively. Also included in depreciation expense for 2024, 2023 and 2022 was $9.6 million and $9.5 million, and $7.6 million, respectively, related to term licenses. (3) See Note 4, “Revenue Recognition” to the notes to condensed consolidated financial statements for more information.

Restructuring and Other Relat_2

Restructuring and Other Related Costs (Tables)	12 Months Ended
	Dec. 28, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Related Costs	The following table presents restructuring and other related costs included in cost of revenue and operating expenses in the accompanying consolidated statements of operations under the restructuring plans (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Cost of Revenue Operating Expenses Cost of Revenue Operating Expenses Cost of Revenue Operating Expenses Severance and related expenses $ 596 $ 2,867 $ 2,218 $ 3,665 $ 203 $ 1,834 Lease related impairment charges — 1,319 — 2,996 — 8,059 Asset impairment and others — — — 56 19 229 Total $ 596 $ 4,186 $ 2,218 $ 6,717 $ 222 $ 10,122
Schedule of Restructuring Reserve by Type of Cost	Restructuring liabilities are reported within accrued expenses in the accompanying consolidated balance sheets (in thousands): Severance and related expenses Lease related impairment charges Asset impairment and others Total Balance as of December 31, 2022 $ 792 $ — $ 149 $ 941 Charges 5,883 2,996 56 8,935 Cash payments (801) (1,773) (60) (2,634) Non-cash Settlements and Other 13 (1,223) 10 (1,200) Balance as of December 30, 2023 $ 5,887 $ — $ 155 $ 6,042 Charges 3,463 1,319 — 4,782 Cash payments (8,245) (1,302) — (9,547) Non-cash Settlements and Other (14) (17) (9) (40) Balance as of December 28, 2024 $ 1,091 $ — $ 146 $ 1,237

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 28, 2024
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss	The following table sets forth the changes by component for the periods presented (in thousands): Foreign Currency Translation Actuarial Gain (Loss) on Pension Accumulated Tax Effect Total Balance at December 25, 2021 $ (7,829) $ 4,297 $ (964) $ (4,496) Other comprehensive income (loss) before reclassifications (41,803) 22,538 — (19,265) Amounts reclassified from accumulated other comprehensive loss — 326 964 1,290 Net current-period other comprehensive income (loss) (41,803) 22,864 964 (17,975) Balance at December 31, 2022 $ (49,632) $ 27,161 $ — $ (22,471) Other comprehensive loss before reclassifications (9,962) (2,002) — (11,964) Amounts reclassified from accumulated other comprehensive loss — (413) — (413) Net current-period other comprehensive loss (9,962) (2,415) — (12,377) Balance at December 30, 2023 $ (59,594) $ 24,746 $ — $ (34,848) Other comprehensive income (loss) before reclassifications (5,459) 7,358 — 1,899 Amounts reclassified from accumulated other comprehensive loss — (439) — (439) Net current-period other comprehensive income (loss) (5,459) 6,919 — 1,460 Balance at December 28, 2024 $ (65,053) $ 31,665 $ — $ (33,388)

Basic and Diluted Net Loss Pe_2

Basic and Diluted Net Loss Per Common Share (Tables)	12 Months Ended
	Dec. 28, 2024
Earnings Per Share [Abstract]
Schedule of Computation of Net Income (Loss) Per Common Share Basic and Diluted	The following table sets forth the computation of net loss per common share (in thousands, except per share amounts): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Net loss $ (150,338) $ (25,213) $ (76,043) Weighted average common shares outstanding - basic and diluted 234,672 226,726 216,376 Net loss per common share - basic and diluted $ (0.64) $ (0.11) $ (0.35)
Schedule of Antidilutive Shares Excluded from Computation of Diluted Net Income (Loss) Per Share	The following table sets forth the potentially dilutive shares excluded from the computation of the diluted net loss per share because their effect was anti-dilutive (in thousands): As of December 28, 2024 December 30, 2023 December 31, 2022 Convertible senior notes 27,414 32,814 55,800 Restricted stock units 14,695 13,619 14,836 Performance stock units 3,955 3,668 2,685 Employee stock purchase plan shares — 53 360 Total 46,064 50,154 73,681

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 28, 2024
Debt Disclosure [Abstract]
Schedule of Components of Convertible Senior Notes	The following is a summary of the Company's debt as of December 28, 2024 (in thousands): Net Carrying Value Unpaid Principal Balance Contractual Maturity Date Current Long-Term 2027 Notes $ — $ 197,807 $ 200,000 March 2027 2028 Notes — 464,310 473,750 August 2028 Mortgage 482 5,813 6,295 August 2029 Total Debt $ 482 $ 667,930 $ 680,045 The following is a summary of the Company's debt as of December 30, 2023 (in thousands): Net Carrying Value Unpaid Principal Balance Contractual Maturity Date Current Long-Term 2024 Notes $ 18,747 $ — $ 18,747 September 2024 2027 Notes — 196,829 200,000 March 2027 2028 Notes — 461,927 473,750 August 2028 Mortgage 6,765 — 6,765 May 2024 Total Debt $ 25,512 $ 658,756 $ 699,262 Conversion Rate and Initial Conversion Price for each series of convertible senior notes are presented in the following table: Conversion Rate per $1,000 Principal Initial Conversion Price 2027 Notes 130.5995 $ 7.66 2028 Notes 147.1183 $ 6.80 The net carrying amount of the convertible senior notes as of December 28, 2024, and as of December 30, 2023 was as follows (in thousands): 2024 Notes 2027 Notes 2028 Notes December 28, 2024 December 30, 2023 December 28, 2024 December 30, 2023 December 28, 2024 December 30, 2023 Principal $ — $ 18,747 $ 200,000 $ 200,000 $ 473,750 $ 473,750 Unamortized issuance costs and discount — — (2,193) (3,171) (9,440) (11,823) Net carrying amount $ — $ 18,747 $ 197,807 $ 196,829 $ 464,310 $ 461,927
Schedule of Interest Expense Recognized Related To Notes	The following table presents the interest expense and the amortization of debt issuance costs related to the convertible senior notes included in Interest expense in the Company's consolidated statements of operations (in thousands): Year Ended December 28, 2024 December 30, 2023 December 31, 2022 Contractual interest expense $ 23,032 $ 22,263 $ 16,589 Amortization of debt issuance costs 3,360 4,064 3,404 Total interest expense $ 26,392 $ 26,327 $ 19,993

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 28, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Interest and Principal Payments	The following table sets forth commitments and contingencies related to our various obligations (in thousands): Payments Due by Period Total 2025 2026 2027 2028 2029 Thereafter Operating leases (1)(2) $ 101,466 $ 15,679 $ 12,906 $ 11,405 $ 7,035 $ 3,155 $ 51,286 Financing lease obligations (3) 4,619 1,861 997 951 810 — — Purchase obligations (4) 376,266 364,224 12,042 — — — — 2028 Notes, including interest (5) 544,813 17,766 17,766 17,766 491,515 — — 2027 Notes, including interest (5) 212,500 5,000 5,000 202,500 — — — Mortgage Payable, including interest (5) 8,105 945 945 945 945 4,325 — Total contractual obligations $ 1,247,769 $ 405,475 $ 49,656 $ 233,567 $ 500,305 $ 7,480 $ 51,286 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $6.1 million and $4.6 million as of December 28, 2024 and December 30, 2023, respectively. As of December 28, 2024, $6.1 million is classified as other long-term liabilities on the accompanying consolidated balance sheets. (3) The Company has finance leases for computer hardware and leasehold improvements. The above payment schedule includes interest. See Note 3, "Leases" to the notes to consolidated financial statements for more information. (4) The Company has agreements with its major production suppliers, where the Company is committed to purchase certain parts. As of December 28, 2024, December 30, 2023 and December 31, 2022, these non-cancelable purchase commitments were $376.3 million, $466.3 million and $744.8 million, respectively. (5)
Schedule of Operating Lease Liabilities	The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of December 28, 2024 (in thousands): Operating Lease Finance Lease Total lease payments (1) $ 101,466 $ 4,619 Less: interest (2) 47,917 387 Present value of lease liabilities $ 53,549 $ 4,232 (1) Refer to Note 12, “Commitments and Contingencies" to the notes to consolidated financial statements for the future minimum lease payments as of December 28, 2024. (2) Calculated using the interest rate for each lease. The following table sets forth commitments and contingencies related to our various obligations (in thousands): Payments Due by Period Total 2025 2026 2027 2028 2029 Thereafter Operating leases (1)(2) $ 101,466 $ 15,679 $ 12,906 $ 11,405 $ 7,035 $ 3,155 $ 51,286 Financing lease obligations (3) 4,619 1,861 997 951 810 — — Purchase obligations (4) 376,266 364,224 12,042 — — — — 2028 Notes, including interest (5) 544,813 17,766 17,766 17,766 491,515 — — 2027 Notes, including interest (5) 212,500 5,000 5,000 202,500 — — — Mortgage Payable, including interest (5) 8,105 945 945 945 945 4,325 — Total contractual obligations $ 1,247,769 $ 405,475 $ 49,656 $ 233,567 $ 500,305 $ 7,480 $ 51,286 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $6.1 million and $4.6 million as of December 28, 2024 and December 30, 2023, respectively. As of December 28, 2024, $6.1 million is classified as other long-term liabilities on the accompanying consolidated balance sheets. (3) The Company has finance leases for computer hardware and leasehold improvements. The above payment schedule includes interest. See Note 3, "Leases" to the notes to consolidated financial statements for more information. (4) The Company has agreements with its major production suppliers, where the Company is committed to purchase certain parts. As of December 28, 2024, December 30, 2023 and December 31, 2022, these non-cancelable purchase commitments were $376.3 million, $466.3 million and $744.8 million, respectively. (5)
Schedule of Finance Lease Obligations Maturity	The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of December 28, 2024 (in thousands): Operating Lease Finance Lease Total lease payments (1) $ 101,466 $ 4,619 Less: interest (2) 47,917 387 Present value of lease liabilities $ 53,549 $ 4,232 (1) Refer to Note 12, “Commitments and Contingencies" to the notes to consolidated financial statements for the future minimum lease payments as of December 28, 2024. (2) Calculated using the interest rate for each lease. The following table sets forth commitments and contingencies related to our various obligations (in thousands): Payments Due by Period Total 2025 2026 2027 2028 2029 Thereafter Operating leases (1)(2) $ 101,466 $ 15,679 $ 12,906 $ 11,405 $ 7,035 $ 3,155 $ 51,286 Financing lease obligations (3) 4,619 1,861 997 951 810 — — Purchase obligations (4) 376,266 364,224 12,042 — — — — 2028 Notes, including interest (5) 544,813 17,766 17,766 17,766 491,515 — — 2027 Notes, including interest (5) 212,500 5,000 5,000 202,500 — — — Mortgage Payable, including interest (5) 8,105 945 945 945 945 4,325 — Total contractual obligations $ 1,247,769 $ 405,475 $ 49,656 $ 233,567 $ 500,305 $ 7,480 $ 51,286 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $6.1 million and $4.6 million as of December 28, 2024 and December 30, 2023, respectively. As of December 28, 2024, $6.1 million is classified as other long-term liabilities on the accompanying consolidated balance sheets. (3) The Company has finance leases for computer hardware and leasehold improvements. The above payment schedule includes interest. See Note 3, "Leases" to the notes to consolidated financial statements for more information. (4) The Company has agreements with its major production suppliers, where the Company is committed to purchase certain parts. As of December 28, 2024, December 30, 2023 and December 31, 2022, these non-cancelable purchase commitments were $376.3 million, $466.3 million and $744.8 million, respectively. (5)
Schedule of Financing Assistance Arrangement	The following table sets forth commitments and contingencies related to our various obligations (in thousands): Payments Due by Period Total 2025 2026 2027 2028 2029 Thereafter Operating leases (1)(2) $ 101,466 $ 15,679 $ 12,906 $ 11,405 $ 7,035 $ 3,155 $ 51,286 Financing lease obligations (3) 4,619 1,861 997 951 810 — — Purchase obligations (4) 376,266 364,224 12,042 — — — — 2028 Notes, including interest (5) 544,813 17,766 17,766 17,766 491,515 — — 2027 Notes, including interest (5) 212,500 5,000 5,000 202,500 — — — Mortgage Payable, including interest (5) 8,105 945 945 945 945 4,325 — Total contractual obligations $ 1,247,769 $ 405,475 $ 49,656 $ 233,567 $ 500,305 $ 7,480 $ 51,286 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $6.1 million and $4.6 million as of December 28, 2024 and December 30, 2023, respectively. As of December 28, 2024, $6.1 million is classified as other long-term liabilities on the accompanying consolidated balance sheets. (3) The Company has finance leases for computer hardware and leasehold improvements. The above payment schedule includes interest. See Note 3, "Leases" to the notes to consolidated financial statements for more information. (4) The Company has agreements with its major production suppliers, where the Company is committed to purchase certain parts. As of December 28, 2024, December 30, 2023 and December 31, 2022, these non-cancelable purchase commitments were $376.3 million, $466.3 million and $744.8 million, respectively. (5)

Guarantees (Tables)

Guarantees (Tables)	12 Months Ended
	Dec. 28, 2024
Guarantees [Abstract]
Schedule of Activity Related to Product Warranty	Activity related to product warranty was as follows (in thousands): December 28, 2024 December 30, 2023 Beginning balance $ 33,200 $ 36,621 Charges to operations 16,497 22,304 Utilization (16,128) (20,516) Change in estimate (1) (8,062) (5,209) Balance at the end of the period $ 25,507 $ 33,200 (1) The Company records product warranty liabilities based on the latest quality and cost information available as of the date the revenue is recorded. The changes in estimate shown here are due to changes in overall actual failure rates, the mix of new versus used units related to replacement of failed units, and changes in the estimated cost of repair and product recalls. As the Company's products mature over time, failure rates and repair costs associated with such products generally decline leading to favorable changes in warranty reserves.
Schedule of Guarantor Obligations	Details are set in below table (in thousands). December 28, 2024 December 30, 2023 Customer performance guarantees $ 25,922 $ 19,068 Value added tax license 2,682 3,127 Property leases 1,356 1,894 Total $ 29,960 $ 24,089

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 28, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Common Stock Reserved for Future Issuance	Common stock reserved for future issuance was as follows (in thousands): December 28, 2024 Outstanding stock awards 16,243 Reserved for future award grants 9,709 Reserved for future ESPP 1,098 Total common stock reserved for stock options and awards 27,050
Schedule of Company's Equity Award Activity - RSUs	The following tables summarize the Company’s equity award activity and related information (in thousands, except per share data): Number of Weighted-Average Aggregate Outstanding at December 25, 2021 11,607 $ 7.66 $ 110,849 RSUs granted 8,897 $ 8.26 RSUs released (6,690) $ 7.52 $ 46,104 RSUs canceled (1,226) $ 7.89 Outstanding at December 31, 2022 12,588 $ 8.13 $ 84,847 RSUs granted 6,990 $ 6.97 RSUs released (7,496) $ 8.1 $ 43,001 RSUs canceled (546) $ 8.01 Outstanding at December 30, 2023 11,536 $ 7.45 $ 54,802 RSUs granted 9,093 $ 4.88 RSUs released (6,378) $ 7.66 $ 37,123 RSUs canceled (1,519) $ 6.41 Outstanding at December 28, 2024 12,732 $ 5.64 $ 83,649
Schedule of Company's Equity Award Activity - PSUs	Number of Weighted-Average Aggregate Outstanding at December 25, 2021 2,114 $ 6.66 $ 20,184 PSUs granted 899 $ 8.38 PSUs released (335) $ 5.40 $ 2,592 PSUs canceled (119) $ 7.19 Outstanding at December 31, 2022 2,559 $ 7.40 $ 17,251 PSUs granted 1,835 $ 7.26 PSUs canceled (741) $ 5.94 Outstanding at December 30, 2023 3,653 $ 7.63 $ 17,352 PSUs granted 1,224 $ 6.80 PSUs released (405) $ 8.61 $ 2,047 PSUs canceled (961) $ 7.19 Outstanding at December 28, 2024 3,511 $ 7.34 $ 23,068
Schedule of Stock-based Compensation Cost for Instruments Granted But Not Yet Amortized	The following table presents total stock-based compensation cost for instruments granted but not yet recognized, net of forfeitures, of the Company’s equity compensation plans as of December 28, 2024. These costs are expected to be amortized on a straight-line basis over the following weighted-average periods (in thousands, except for weighted-average period): Unrecognized Weighted- RSUs $ 52,350 1.57 PSUs $ 7,281 1.92
Schedule of Estimated Fair Value of ESPP Shares	The fair value of the ESPP shares was estimated at the date of grant using the following assumptions: Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Volatility n/a 60% - 63% 39% - 63% Risk-free interest rate n/a 3.12% - 4.98% 0.67% - 3.12% Expected life n/a 0.5 years 0.5 years Estimated fair value n/a $1.91 - $2.37 $1.91 - $2.21
Schedule of Employee Stock Purchase Plan Activity	ESPP activity was as below (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Stock-based compensation expense $ — $ 3,798 $ 5,551 Employee contributions $ — $ 14,930 $ 15,189 Shares purchased — 3,514 2,552
Schedule of Share-Based Payment Award, Valuation Assumptions	Assumptions for awards granted during 2024 include the following: Year Ended December 28, 2024 Historical volatility of Infinera common stock 53.28% - 58.30% Correlation coefficient 0.4740 - 0.4858 Expected life in years 2.52 - 2.79 years Risk-free interest rate 4.25% - 4.5% Expected dividend yield —%
Schedule of Nonvested Performance Based Units Activity by Grant Year	The following table summarizes by grant year, the Company’s PSU activity for the fiscal year ended December 28, 2024 (in thousands): Total Number of Performance Stock Units 2020 2021 2022 2023 2024 Outstanding at December 30, 2023 3,653 350 602 899 1,802 — PSUs granted 1,224 — — — — 1,224 PSUs released (405) — (405) — — — PSUs canceled (961) (350) (197) (137) (245) (32) Outstanding at December 28, 2024 3,511 — — 762 1,557 1,192
Schedule of Stock-based Compensation Expense and Effects of Stock-Based Compensation on Company's Balance Sheets and Statements of Operations	The following table summarizes the amortization of stock-based compensation expense related to the RSUs, and PSUs (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 RSUs $ 49,731 $ 52,723 $ 54,102 PSUs $ 1,199 $ 5,545 $ 1,636 The following table summarizes the effects of stock-based compensation on the Company’s consolidated balance sheets and statements of operations for the periods presented (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Stock-based compensation effects in inventory $ 1,795 $ 3,895 $ 3,979 Income tax benefit associated with stock-based compensation $ 9,133 $ 8,165 $ 8,588 Stock-based compensation effects in net loss before income taxes Cost of revenue $ 7,621 $ 10,000 $ 9,485 Research and development 18,779 22,474 23,553 Sales and marketing 12,175 13,699 13,311 General and administrative 12,346 15,977 14,666 Total stock-based compensation expense $ 50,921 $ 62,150 $ 61,015

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 28, 2024
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	The following is a geographic breakdown of the loss before income taxes (in millions): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Domestic $ (54.2) $ 47.6 $ (75.7) International (78.8) (65.0) 20.2 Loss before income taxes $ (133.0) $ (17.4) $ (55.5)
Schedule of Geographic Breakdown of Provision for (Benefit from) Income Taxes	The following is a geographic breakdown of the provision for income taxes (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Current: Federal $ 357 $ 1,278 $ 945 State 2,966 3,035 1,537 Foreign 14,200 5,672 20,616 Total current $ 17,523 $ 9,985 $ 23,098 Deferred: Federal $ — $ — $ — State — — — Foreign (211) (2,180) (2,566) Total deferred $ (211) $ (2,180) $ (2,566) Total provision for income taxes $ 17,312 $ 7,805 $ 20,532
Schedule of Provisions for Income Taxes Computed by Applying Statutory Federal Income Tax Rates	The provision for (benefit from) income taxes differs from the amount computed by applying the statutory federal income tax rates as follows: Years Ended December 28, 2024 December 30, 2023 December 31, 2022 Expected tax at federal statutory rate 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit (0.9) % (15.5) % (2.3) % Tax credits 5.6 % (37.9) % 10.2 % Stock-based compensation (3.6) % (42.3) % (10.2) % Change in valuation allowance (23.3) % 20.7 % (19.1) % Foreign rate differential (5.2) % 4.8 % (7.6) % Non-deductible expenses (0.6) % (5.7) % (16.1) % Other taxes on foreign operations (4.3) % (24.1) % (5.0) % Return to provision (0.5) % 44.2 % (3.7) % Uncertain tax positions (1.4) % (3.6) % (1.8) % Prior year adjustment — % (4.4) % (1.0) % Other 0.2 % (2.0) % (1.5) % Effective tax rate (13.0) % (44.8) % (37.1) %
Schedule of Deferred Tax Assets and Liabilities	Deferred tax assets and liabilities are recognized for the future tax consequences of differences between the carrying amounts of assets and liabilities and their respective tax basis using enacted tax rates in effect for the year in which the differences are expected to reverse. Significant deferred tax assets and liabilities consist of the following (in thousands): Years Ended December 28, 2024 December 30, 2023 Deferred tax assets: Net operating losses $ 278,932 $ 296,449 Research and foreign tax credits 142,844 137,130 Non-deductible accruals 56,755 63,763 R&D expense capitalization 84,945 65,125 Inventory valuation 13,908 13,612 Leasing Liabilities 20,772 23,917 Stock-based compensation 4,503 4,016 Property, plant and equipment 781 — Total deferred tax assets $ 603,440 $ 604,012 Valuation allowance (580,577) (576,998) Net deferred tax assets $ 22,863 $ 27,014 Deferred tax liabilities: Property, plant and equipment $ — $ (281) Right of use asset (15,230) (17,946) Acquired intangible assets (2,969) (4,113) Total deferred tax liabilities $ (18,199) $ (22,340) Net deferred tax assets (liabilities) $ 4,664 $ 4,674
Schedule of Aggregate Changes in Balance of Gross Unrecognized Tax Benefits	The aggregate changes in the balance of gross unrecognized tax benefits were as follows (in thousands): December 28, 2024 December 30, 2023 December 31, 2022 Beginning balance $ 74,171 $ 57,849 $ 54,250 Tax position related to current year Additions 1,020 1,417 1,536 Tax positions related to prior years Additions 6,167 20,638 7,220 Reductions (1,948) (5,578) (4,832) Lapses of statute of limitations (110) (155) (325) Ending balance $ 79,300 $ 74,171 $ 57,849

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 28, 2024
Segment Reporting [Abstract]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	Reconciliation of Income (Loss) from Operations was as below (in thousands): Years Ended December 28, 2024 December 30, 2023 December 31, 2022 GAAP as reported $ (83,650) $ (4,840) $ (60,157) Stock-based compensation 50,921 62,150 61,015 Amortization of acquired intangible assets 9,025 22,965 37,714 Restructuring and other related costs 4,782 8,935 10,344 Merger-related charges 23,021 — — Inventory related charges — — 14,381 Global distribution center transition costs — — 2,109 Warehouse fire loss (recovery) — (1,985) 2,232 Litigation charges — — 1,350 Non-GAAP as adjusted $ 4,099 $ 87,225 $ 68,988
Schedule of Property, Plant and Equipment, Net	Additionally, the following table sets forth our property, plant and equipment, net by geographic region (in thousands): December 28, 2024 December 30, 2023 United States $ 232,041 $ 188,684 Other Americas 3,894 2,777 Europe, Middle East and Africa 8,779 9,973 Asia Pacific 4,782 5,563 Total property, plant and equipment, net $ 249,496 $ 206,997

Employee Benefit and Pension _2

Employee Benefit and Pension Plans (Tables)	12 Months Ended
	Dec. 28, 2024
Retirement Benefits [Abstract]
Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan	The following table sets forth the changes in benefits obligations and the fair value of plan assets of the Company's benefit plans (in thousands): December 28, 2024 December 30, 2023 Benefit obligation at beginning of year $ 85,157 $ 76,172 Service cost 126 163 Interest cost 2,840 3,103 Benefits paid (3,951) (4,700) Actuarial loss (gain) (854) 7,156 Employee contributions 22 18 Foreign currency exchange rate changes (5,278) 3,245 Benefit obligation at end of year (1) $ 78,062 $ 85,157 Fair value of plan assets at beginning of year $ 76,577 $ 66,455 Actual return on plan assets 9,340 7,793 Payments (7,086) (767) Employee contributions 22 124 Employer contributions 96 78 Foreign currency exchange rate changes (4,581) 2,894 Fair value of plan assets at end of year $ 74,368 $ 76,577 Net liability recognized $ 3,694 $ 8,580 (1) The Company's accumulated benefit obligation was $77.6 million and $84.7 million at December 28, 2024 and December 30, 2023, respectively.
Schedule of Amounts Recognized in Balance Sheet	The following table presents net amounts of non-current assets and current and non-current liabilities for the Company's pension and other post-retirement benefit plans recognized on its consolidated balance sheet (in thousands): December 28, 2024 December 30, 2023 Other non-current assets $ 74,368 $ 76,577 Other long-term liabilities (78,062) (85,157) Net liability recognized $ (3,694) $ (8,580)
Schedule of Net Benefit Costs	Net periodic benefit cost for the Company's pension and other post-retirement benefit plans consisted of the following (in thousands): Years ended December 28, 2024 December 30, 2023 December 31, 2022 Service cost $ 126 $ 163 $ 300 Interest cost 2,840 3,103 1,249 Expected return on plan assets (2,930) (2,639) (2,936) Amortization of net actuarial (gain) loss (439) (413) 326 Total net periodic (benefit) cost $ (403) $ 214 $ (1,061)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)	The following table sets forth the changes in accumulated other comprehensive income (loss) for the Company's benefit plans (pre-tax) (in thousands): December 28, 2024 December 30, 2023 Beginning balance $ 24,746 $ 27,161 Net actuarial (gain) loss arising in current year 7,358 (2,002) Amortization of net actuarial (gain) loss (1) (439) (413) Ending balance $ 31,665 $ 24,746 (1) The actuarial loss for the fiscal year ended December 28, 2024 is primarily due to the change in the discount rate. Amounts recorded in accumulated other comprehensive income (loss) expected to be amortized as a part of net periodic pension cost during 2025 is $1.4 million (pre-tax).
Schedule of Assumptions Used	Certain actuarial assumptions used in computing the benefit obligations for the major plans are as follows: December 28, 2024 December 30, 2023 Discount rate 3.48 % 3.51 % Salary growth rate 2.25 % 2.50 % Pension growth rate 2.00 % 2.25 % Expected long-term rate of return on plan assets 3.93 % 3.93 %
Schedule of Allocation of Plan Assets	The following tables present the fair value of plan assets for pension and other benefit plans by major asset category (in thousands): As of December 28, 2024 December 30, 2023 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Cash $ 661 $ — $ 661 $ 677 $ — $ 677 Equity fund — 50,656 50,656 — 51,226 51,226 Insurance contracts — 23,051 23,051 — 24,674 24,674 Total plan assets at fair value $ 661 $ 73,707 $ 74,368 $ 677 $ 75,900 $ 76,577
Schedule of Expected Benefit Payments	Estimated future benefit payments under the Company's pension plans as of December 28, 2024 are as follows (in thousands): 2025 $ 5,779 2026 4,191 2027 3,854 2028 4,336 2029 4,202 2030 to 2034 22,684

Organization and Basis of Pre_2

Organization and Basis of Presentation (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 27, 2024 USD ($) $ / shares
Business Acquisition [Line Items]
Merger-related charges	$ 23,021	$ 0	$ 0
Nokia Corporation
Business Acquisition [Line Items]
Termination fee				$ 65,000
Nokia Corporation | Nokia Corporation
Business Acquisition [Line Items]
Termination fee				$ 130,000
Cash Consideration | Nokia Corporation
Business Acquisition [Line Items]
Share price (in dollars per share) | $ / shares				$ 6.65
Share Consideration | Nokia Corporation
Business Acquisition [Line Items]
Exchange ratio				1.7896
Mixed Consideration | Nokia Corporation
Business Acquisition [Line Items]
Share price (in dollars per share) | $ / shares				$ 4.66
Exchange ratio				0.5355

Significant Accounting Polici_4

Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Significant Accounting Policies [Line Items]
Contractual support period (in years)	1 year
Stock plan offering period (in months)	6 months
Advertising expenses	$ 1.3	$ 1.5	$ 1.5
Foreign currency transaction gain (loss)	22	(14.8)	(12.8)
Revenue reserves recorded for potential sales returns	$ 0.6	$ 0.3	$ 3.6
Software warranty period (in days)	90 days
Operating lease, renewal term (in years)	10 years
Customer One | Accounts Receivable | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk (in percent)	11%
Customer One | Revenue | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk (in percent)	12%	10%	11%
Minimum
Significant Accounting Policies [Line Items]
Payment term (in days)	30 days
Purchase commitment time frame (in months)	12 months
Product warranty period (in years)	1 year
Operating lease period (in years)	1 year
Minimum | Performance stock units
Significant Accounting Policies [Line Items]
Award performance period (in years)	2 years
Ranges of number of shares issued on vesting of PSUs	0
Minimum | New Hire Employee | RSUs
Significant Accounting Policies [Line Items]
Award vesting period (in years)	1 year
Maximum
Significant Accounting Policies [Line Items]
Payment term (in days)	120 days
Purchase commitment time frame (in months)	24 months
Product warranty period (in years)	5 years
Operating lease period (in years)	24 years
Maximum | Performance stock units
Significant Accounting Policies [Line Items]
Award performance period (in years)	3 years
Ranges of number of shares issued on vesting of PSUs	2
Maximum | New Hire Employee | RSUs
Significant Accounting Policies [Line Items]
Award vesting period (in years)	4 years

Significant Accounting Polici_5

Significant Accounting Policies - Estimated Useful Life for Each Asset (Details)	Dec. 28, 2024
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	3 years
Minimum | Laboratory and manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	1 year 6 months
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	3 years
Minimum | Computer hardware
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	3 years
Minimum | Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	1 year
Maximum | Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	20 years
Maximum | Laboratory and manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	10 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	5 years
Maximum | Computer hardware
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	5 years
Maximum | Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful lives (in years)	24 years

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Rent expense	$ 15	$ 13.9	$ 21.1
Accelerated rent expense	1.3	3	$ 8.1
Finance lease right of use asset	$ 3.3	$ 4.5
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance lease period (in years)	3 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance lease period (in years)	5 years

Leases - Operating Leases (Deta

Leases - Operating Leases (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Leases [Abstract]
Accrued expenses and other current liabilities	$ 11,948	$ 11,888
Long-term operating lease liabilities	41,601	47,464
Total operating lease liability	$ 53,549	$ 59,352
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Other Accrued Liabilities, Current	Accounts Payable and Other Accrued Liabilities, Current
Finance lease, liability, statement of financial position [Extensible List]	Property, plant and equipment, net	Property, plant and equipment, net

Leases - Operating Lease Maturi

Leases - Operating Lease Maturity (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Operating Lease
Total	$ 101,466
Less: interest	47,917
Present value of lease liabilities	53,549	$ 59,352
Finance Lease
Total	4,619
Less: interest	387
Present value of lease liabilities	$ 4,232

Leases - Lease Costs (Details)

Leases - Lease Costs (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2024 USD ($)
Operating Lease
Weighted average remaining lease term	15 years 2 months 4 days
Weighted average discount rate	10.71%
Cash paid for amounts included in the measurement of lease liabilities	$ 16,889
Leased assets obtained in exchange for new lease liabilities	$ 6,529
Finance Lease
Weighted average remaining lease term	3 years 3 months 21 days
Weighted average discount rate	10%
Cash paid for amounts included in the measurement of lease liabilities	$ 562
Leased assets obtained in exchange for new lease liabilities	$ 0

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 1,418,446	$ 1,614,128	$ 1,573,242
United States
Disaggregation of Revenue [Line Items]
Revenue	834,472	994,311	870,282
Other Americas
Disaggregation of Revenue [Line Items]
Revenue	80,260	99,920	101,600
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue	364,581	359,201	405,328
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	139,133	160,696	196,032
Product
Disaggregation of Revenue [Line Items]
Revenue	1,103,131	1,304,229	1,268,624
Services
Disaggregation of Revenue [Line Items]
Revenue	315,315	309,899	304,618
Direct
Disaggregation of Revenue [Line Items]
Revenue	900,421	1,067,570	1,191,584
Indirect
Disaggregation of Revenue [Line Items]
Revenue	$ 518,025	$ 546,558	$ 381,658

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Revenue from Contract with Customer [Abstract]
Deferred revenue recognized	$ 120.8	$ 133.6

Revenue Recognition - Contract

Revenue Recognition - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 336,552	$ 381,981
Contract assets	60,039	46,738
Contract liabilities	(25,350)	(3,313)
Deferred revenue	(164,017)	(157,580)
refund liability	$ 55,100	$ 85,900

Revenue Recognition - Revenue,

Revenue Recognition - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized in the future as of December 28, 2024	$ 597,745
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-12-29
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized in the future as of December 28, 2024	$ 392,383
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized in the future as of December 28, 2024	$ 115,506
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized in the future as of December 28, 2024	$ 52,717
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized in the future as of December 28, 2024	$ 20,735
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized in the future as of December 28, 2024	$ 11,728
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized in the future as of December 28, 2024	$ 4,676
Revenue, remaining performance obligation, expected timing of satisfaction, period

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 65,000	$ 115,000
Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	764,971	658,609
Level 1 | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	65,000	115,000
Level 1 | Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	0	0
Level 2 | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Level 2 | Convertible senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	$ 764,971	$ 658,609

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024		Dec. 30, 2023		Dec. 31, 2022		Dec. 25, 2021
Cash and Cash Equivalents [Line Items]
Accelerated rent expense	$ 1,300		$ 3,000		$ 8,100
Cash, cash equivalents and restricted cash	146,228	[1]	173,859	[1]	$ 189,203	[1]	$ 202,521
Foreign Subsidiary
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	$ 38,400		$ 48,100
[1]Reconciliation of cash, cash equivalents and restricted cash to the consolidated balance sheets: December 28, 2024 December 30, 2023 December 31, 2022 (In thousands) Cash and cash equivalents $ 145,808 $ 172,505 $ 178,657 Short-term restricted cash — 517 7,274 Long-term restricted cash 420 837 3,272 Total cash, cash equivalents and restricted cash $ 146,228 $ 173,859 $ 189,203

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill Roll Forward (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 240,566
Foreign currency translation adjustments	(16,333)
Goodwill, Ending Balance	$ 224,233

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated impairment loss	$ 0
Amortization expense	$ 9,000,000	$ 23,000,000	$ 37,700,000

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Acquired Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (56,406)	$ (47,381)
Total future amortization expense	15,794
Total intangible assets with finite lives	72,200	72,200
Total intangible assets with finite lives	15,794	24,819
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	72,200	72,200
Accumulated Amortization	(56,406)	(47,381)
Total future amortization expense	$ 15,794	$ 24,819
Remaining Useful Life (In Years)	1 year 9 months 18 days	2 years 9 months 18 days

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Future Amortization Expense (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Total future amortization expense	$ 15,794
2025	9,025
2026	6,769
2027	0
2028	0
2029	0
Thereafter	$ 0

Balance Sheet Details - Allowan

Balance Sheet Details - Allowance for Credit Losses (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2024 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 876
Additions	1,324
Write offs	(1,398)
Ending balance	$ 802

Balance Sheet Details - Narrati

Balance Sheet Details - Narrative (Details) - Trade accounts receivable - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Interest expense	$ 0.6	$ 0.9	$ 0.9
Account receivables sold	$ 39.5	$ 62.6

Balance Sheet Details - Details

Balance Sheet Details - Details of Selected Balance Sheet Items (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Inventory
Raw materials	$ 69,687	$ 133,561
Work in process	67,949	68,407
Finished goods	170,577	229,195
Total	308,213	431,163
Property, plant and equipment, net
Subtotal	659,998	580,734
Less accumulated depreciation and amortization	(410,502)	(373,737)
Property, plant and equipment, net	249,496	206,997
Accrued expenses and other current liabilities
Loss contingency related to non-cancelable purchase commitments	28,242	17,909
Taxes payable	15,292	24,248
Restructuring accrual	1,237	6,042
Short-term operating and finance lease liability	13,594	12,905
Customer contract liabilities	25,350	3,313
Other accrued expenses and other current liabilities	59,670	46,341
Total accrued expenses and other current liabilities	143,385	110,758
Depreciation expense	52,900	55,800	$ 46,100
License Agreement Terms
Accrued expenses and other current liabilities
Depreciation expense	9,600	9,500	7,600
Computer hardware
Property, plant and equipment, net
Subtotal	48,459	48,611
Computer software
Property, plant and equipment, net
Subtotal	71,954	74,752
Laboratory and manufacturing equipment
Property, plant and equipment, net
Subtotal	380,417	354,103
Land and building
Property, plant and equipment, net
Subtotal	12,372	12,372
Furniture and fixtures
Property, plant and equipment, net
Subtotal	3,177	2,916
Leasehold and building improvements
Property, plant and equipment, net
Subtotal	46,544	46,652
Construction in progress
Property, plant and equipment, net
Subtotal	97,075	41,328
Enterprise Resource Planning
Property, plant and equipment, net
Subtotal	33,500	34,800
Property, plant and equipment, net	5,400	9,600
Accrued expenses and other current liabilities
Depreciation expense	4,800	4,900	$ 3,500
Enterprise Resource Planning | License
Property, plant and equipment, net
Subtotal	27,200	29,600
Property, plant and equipment, net	$ 14,000	$ 23,600

Restructuring and Other Relat_3

Restructuring and Other Related Costs - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended		24 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 28, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,782	$ 8,935
2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	500	$ 5,900	$ 6,400
2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,900

Restructuring and Other Relat_4

Restructuring and Other Related Costs - Restructuring and Other Related Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,782	$ 8,935
Severance and related expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,463	5,883
Lease related impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,319	2,996
Asset impairment and others
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	56
Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 596	$ 2,218	$ 222
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Cost of revenue	Cost of revenue	Cost of revenue
Cost of Revenue | Severance and related expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 596	$ 2,218	$ 203
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Cost of revenue	Cost of revenue	Cost of revenue
Cost of Revenue | Lease related impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 0	$ 0
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Cost of revenue	Cost of revenue	Cost of revenue
Cost of Revenue | Asset impairment and others
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 0	$ 19
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Cost of revenue	Cost of revenue	Cost of revenue
Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,186	$ 6,717	$ 10,122
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Operating Expenses	Operating Expenses	Operating Expenses
Operating Expenses | Severance and related expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,867	$ 3,665	$ 1,834
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Operating Expenses	Operating Expenses	Operating Expenses
Operating Expenses | Lease related impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,319	$ 2,996	$ 8,059
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Operating Expenses	Operating Expenses	Operating Expenses
Operating Expenses | Asset impairment and others
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 56	$ 229
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Operating Expenses	Operating Expenses	Operating Expenses

Restructuring and Other Relat_5

Restructuring and Other Related Costs - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Thousands	12 Months Ended		24 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 28, 2024
Restructuring Reserve [Roll Forward]
Beginning balance	$ 6,042	$ 941	$ 941
Charges	4,782	8,935
Cash payments	(9,547)	(2,634)
Non-cash Settlements and Other	(40)	(1,200)
Ending balance	1,237	6,042	1,237
Severance and related expenses
Restructuring Reserve [Roll Forward]
Beginning balance	5,887	792	792
Charges	3,463	5,883
Cash payments	(8,245)	(801)
Non-cash Settlements and Other	(14)	13
Ending balance	1,091	5,887	1,091
Lease related impairment charges
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0
Charges	1,319	2,996
Cash payments	(1,302)	(1,773)
Non-cash Settlements and Other	(17)	(1,223)
Ending balance	0	0	0
Asset impairment and others
Restructuring Reserve [Roll Forward]
Beginning balance	155	149	149
Charges	0	56
Cash payments	0	(60)
Non-cash Settlements and Other	(9)	10
Ending balance	$ 146	$ 155	$ 146

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax:
Beginning balance	$ 216,591	$ 179,647	$ 323,771
Other comprehensive income (loss) before reclassifications	1,899	(11,964)	(19,265)
Amounts reclassified from accumulated other comprehensive loss	(439)	(413)	1,290
Net change in accumulated other comprehensive income (loss)	1,460	(12,377)	(17,975)
Ending balance	116,515	216,591	179,647
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax:
Beginning balance	(34,848)	(22,471)	(4,496)
Net change in accumulated other comprehensive income (loss)	1,460	(12,377)	(17,975)
Ending balance	(33,388)	(34,848)	(22,471)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax:
Beginning balance	(59,594)	(49,632)	(7,829)
Other comprehensive income (loss) before reclassifications	(5,459)	(9,962)	(41,803)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Net change in accumulated other comprehensive income (loss)	(5,459)	(9,962)	(41,803)
Ending balance	(65,053)	(59,594)	(49,632)
Actuarial Gain (Loss) on Pension
AOCI Attributable to Parent, Net of Tax:
Beginning balance	24,746	27,161	4,297
Other comprehensive income (loss) before reclassifications	7,358	(2,002)	22,538
Amounts reclassified from accumulated other comprehensive loss	(439)	(413)	326
Net change in accumulated other comprehensive income (loss)	6,919	(2,415)	22,864
Ending balance	31,665	24,746	27,161
Accumulated Tax Effect
AOCI Attributable to Parent, Net of Tax:
Beginning balance	0	0	(964)
Other comprehensive income (loss) before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0	964
Net change in accumulated other comprehensive income (loss)	0	0	964
Ending balance	$ 0	$ 0	$ 0

Basic and Diluted Net Loss Pe_3

Basic and Diluted Net Loss Per Common Share - Computation of Net Income (Loss) Per Common Share Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net loss	$ (150,338)	$ (25,213)	$ (76,043)
Weighted average common shares outstanding - basic (in shares)	234,672	226,726	216,376
Weighted average common shares outstanding - diluted (in shares)	234,672	226,726	216,376
Net loss per common share - basic (in dollars per share)	$ (0.64)	$ (0.11)	$ (0.35)
Net loss per common share - diluted (in dollars per share)	$ (0.64)	$ (0.11)	$ (0.35)

Basic and Diluted Net Loss Pe_4

Basic and Diluted Net Loss Per Common Share - Antidilutive Shares Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	46,064	50,154	73,681
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	27,414	32,814	55,800
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	14,695	13,619	14,836
Performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	3,955	3,668	2,685
Employee stock purchase plan shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0	53	360

Debt - Components of Convertibl

Debt - Components of Convertible Senior Notes (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Debt Instrument [Line Items]
Current	$ 482	$ 25,512
Long-term debt, net	667,930	658,756
Long-Term Debt, Gross	680,045	699,262
Mortgages
Debt Instrument [Line Items]
Current	482	6,765
Long-term debt, net	5,813	0
Long-Term Debt, Gross	6,295	6,765
2024 Notes
Debt Instrument [Line Items]
Long-term debt, net	0	18,747
2024 Notes | Convertible senior notes
Debt Instrument [Line Items]
Current		18,747
Long-term debt, net		0
Long-Term Debt, Gross		18,747
2027 Notes
Debt Instrument [Line Items]
Long-term debt, net	197,807	196,829
2027 Notes | Convertible senior notes
Debt Instrument [Line Items]
Current	0	0
Long-term debt, net	197,807	196,829
Long-Term Debt, Gross	200,000	200,000
2028 Notes
Debt Instrument [Line Items]
Long-term debt, net	464,310	461,927
2028 Notes | Convertible senior notes
Debt Instrument [Line Items]
Current	0	0
Long-term debt, net	464,310	461,927
Long-Term Debt, Gross	$ 473,750	$ 473,750

Debt - Convertible Debt (Detail

Debt - Convertible Debt (Details)				1 Months Ended				12 Months Ended
	Sep. 01, 2024 USD ($)	Aug. 08, 2022	Mar. 31, 2020 USD ($)	Jun. 30, 2023 USD ($)	Aug. 31, 2022 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2018 USD ($) d	Dec. 28, 2024 USD ($) d	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Gain on extinguishment of debt								$ 0	$ 0	$ 15,521,000
2024 Notes
Debt Instrument [Line Items]
Principal								$ 0	18,747,000
2024 Notes | Senior Notes
Debt Instrument [Line Items]
Principal							$ 402,500,000
Contractual interest rates (in percent)							2.125%
Payment for debt extinguishment				$ 84,000,000	$ 283,600,000
Extinguishment of debt, amount				83,900,000	299,800,000
Gain on extinguishment of debt										15,500,000
Write-off of deferred issuance costs										$ 3,500,000
Convertible threshold minimum percentage (in percent)								130%
Threshold trading (in days) | d								20
Threshold consecutive trading (in days) | d								30
Purchase price as a percentage on principal amount of the notes upon the occurrence of a fundamental change (in percent)							100%	100%
2024 Notes | Convertible senior notes
Debt Instrument [Line Items]
Extinguishment of debt, amount	$ 18,700,000
Extinguishment of debt, interest amount	$ 200,000
2027 Notes
Debt Instrument [Line Items]
Principal								$ 200,000,000	200,000,000
2027 Notes | Senior Notes
Debt Instrument [Line Items]
Principal			$ 200,000,000			$ 200,000,000
Contractual interest rates (in percent)			2.50%			2.50%
Proceeds from issuance of 2024 notes						$ 193,300,000
Additional effective rate of interest to be used on amortized carrying value			3%			3%
Debt issuance costs amortization period (in months)			26 months
2028 Notes
Debt Instrument [Line Items]
Principal								$ 473,750,000	$ 473,750,000
2028 Notes | Senior Notes
Debt Instrument [Line Items]
Principal				100,000,000	$ 373,800,000
Contractual interest rates (in percent)					3.75%
Proceeds from issuance of 2024 notes				$ 96,500,000	$ 362,400,000
Additional effective rate of interest to be used on amortized carrying value		4.30%
Debt issuance costs amortization period (in months)		43 months
2.125% Convertible Senior Notes, Circumstance 1 | Senior Notes
Debt Instrument [Line Items]
Convertible threshold minimum percentage (in percent)							130%
Threshold trading (in days) | d							20
Threshold consecutive trading (in days) | d							30
2.125% Convertible Senior Notes, Circumstance 2 | Senior Notes
Debt Instrument [Line Items]
Principal							$ 1,000
Threshold trading (in days) | d							5
Threshold consecutive trading (in days) | d							5
Convertible, threshold maximum percentage (in percent)							98%

Debt - Conversation Ratio (Deta

Debt - Conversation Ratio (Details)	12 Months Ended
	Dec. 28, 2024 $ / shares
2027 Notes | Senior Notes
Debt Instrument [Line Items]
Conversion ratio	0.1305995
Conversion price (in dollars per share)	$ 7.66
2028 Notes
Debt Instrument [Line Items]
Conversion ratio	0.1471183
2028 Notes | Senior Notes
Debt Instrument [Line Items]
Conversion price (in dollars per share)	$ 6.80

Debt - Interest Expense Recogni

Debt - Interest Expense Recognized Related to Notes Prior to Capitalization of Interest (Details) - 2024 Notes - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Contractual interest expense	$ 23,032	$ 22,263	$ 16,589
Amortization of debt issuance costs	3,360	4,064	3,404
Total interest expense	$ 26,392	$ 26,327	$ 19,993

Debt - Net Carrying Amount (Det

Debt - Net Carrying Amount (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net carrying amount	$ 667,930	$ 658,756
2024 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	0	18,747
Unamortized issuance costs and discount	0	0
Net carrying amount	0	18,747
2027 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	200,000	200,000
Unamortized issuance costs and discount	(2,193)	(3,171)
Net carrying amount	197,807	196,829
2028 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	473,750	473,750
Unamortized issuance costs and discount	(9,440)	(11,823)
Net carrying amount	$ 464,310	$ 461,927

Debt - Revolving Credit Facilit

Debt - Revolving Credit Facility (Details) - USD ($)	Jun. 24, 2022	Dec. 28, 2024
Revolving Credit Facility | Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Line of credit	$ 200,000,000
Additional borrowing capacity	$ 100,000,000
Commitment fee (in percent)	0.25%
Debt issuance costs, net		$ 1,200,000
Debt available borrowing capacity		118,900,000
Revolving Credit Facility | Credit Agreement | Line of Credit | Minimum | SOFR
Debt Instrument [Line Items]
Variable rate (in percent)	1.25%
Revolving Credit Facility | Credit Agreement | Line of Credit | Minimum | Base Rate
Debt Instrument [Line Items]
Variable rate (in percent)	0.25%
Revolving Credit Facility | Credit Agreement | Line of Credit | Maximum | SOFR
Debt Instrument [Line Items]
Variable rate (in percent)	1.75%
Revolving Credit Facility | Credit Agreement | Line of Credit | Maximum | Base Rate
Debt Instrument [Line Items]
Variable rate (in percent)	0.75%
Letter of Credit | Banker's Guarantees Or Performance Bonds
Debt Instrument [Line Items]
Proceeds from line of credit		29,200,000
Letter of Credit | Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Line of credit	$ 50,000,000	$ 50,000,000
Swing Loan Sub-Facility | Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Line of credit	$ 20,000,000

Debt - Mortgage Payable (Detail

Debt - Mortgage Payable (Details) $ in Thousands	1 Months Ended
	Aug. 31, 2024 USD ($) installment	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)
Debt Instrument [Line Items]
Current		$ 482	$ 25,512
Long-term debt, net		667,930	658,756
Mortgages
Debt Instrument [Line Items]
Contractual interest rates (in percent)	7.50%
Debt payment installments | installment	60
Debt payment	$ 100
Long-Term		6,300
Current		482	6,765
Long-term debt, net		$ 5,813	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Future Annual Minimum Operating Lease Payments (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total	$ 101,466
2025	15,679
2026	12,906
2027	11,405
2028	7,035
2029	3,155
Thereafter	$ 51,286

Commitments and Contingencies_2

Commitments and Contingencies - Financing Lease Obligations (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total	$ 4,619
2025	1,861
2026	997
2027	951
2028	810
2029	0
Thereafter	$ 0

Commitments and Contingencies_3

Commitments and Contingencies - Purchase Commitments (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total	$ 376,266
2025	364,224
2026	12,042
2027	0
2028	0
2029	0
Thereafter	$ 0

Commitments and Contingencies_4

Commitments and Contingencies - Future Interest and Principal Payments (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Mortgages, Including Interest
Debt Instrument [Line Items]
Total	$ 8,105
2025	945
2026	945
2027	945
2028	945
2029	4,325
Thereafter	0
2028 Notes, including interest | Senior Notes
Debt Instrument [Line Items]
Total	544,813
2025	17,766
2026	17,766
2027	17,766
2028	491,515
2029	0
Thereafter	0
2027 Notes, including interest | Senior Notes
Debt Instrument [Line Items]
Total	212,500
2025	5,000
2026	5,000
2027	202,500
2028	0
2029	0
Thereafter	$ 0

Commitments and Contingencies_5

Commitments and Contingencies - Total Contractual Obligations (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total	$ 1,247,769
2025	405,475
2026	49,656
2027	233,567
2028	500,305
2029	7,480
Thereafter	$ 51,286

Commitments and Contingencies_6

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ARO, non current	$ 6,100	$ 4,600
Purchase obligation	376,266
Other Noncurrent Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ARO, non current	6,100
Certain Parts, Production Suppliers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase obligation	$ 376,300	$ 466,300	$ 744,800
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating lease period (in years)	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating lease period (in years)	24 years

Guarantees - Activity Related t

Guarantees - Activity Related to Product Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$ 33,200	$ 36,621
Charges to operations	16,497	22,304
Utilization	(16,128)	(20,516)
Change in estimate	(8,062)	(5,209)
Balance at the end of the period	$ 25,507	$ 33,200

Guarantees - Narrative (Details

Guarantees - Narrative (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Guarantor Obligations [Line Items]
Total	$ 29,960	$ 24,089
Bond secure amount	4,000	4,000
Surety Bond
Guarantor Obligations [Line Items]
Bond secure amount	7,500	7,500
Letter of Credit
Guarantor Obligations [Line Items]
Customer performance guarantees	25,922	$ 19,068
Cash collateral	$ 1,300

Guarantees - Letters of Credit

Guarantees - Letters of Credit and Bank Guarantees (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Guarantor Obligations [Line Items]
Total	$ 29,960	$ 24,089
Letter of Credit
Guarantor Obligations [Line Items]
Customer performance guarantees	25,922	19,068
Value added tax license	2,682	3,127
Property leases	$ 1,356	$ 1,894

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details)	1 Months Ended			12 Months Ended
	Jun. 29, 2024 shares	May 31, 2019 shares	Feb. 29, 2016	Dec. 28, 2024 shares	Dec. 27, 2024 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of common stock (in usd per share) | $ / shares					$ 6.57
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award (in years)				3 years
Performance stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award (in years)				2 years
Ranges of number of shares issued on vesting of PSUs				0
Performance stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award (in years)				3 years
Ranges of number of shares issued on vesting of PSUs				2
2016 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)	7,100,000
Reserved common stock for issuance of options (in shares)				58,900,000
Term of award (in years)			10 years
2007 Plan | Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of award (in years)		20 years
Number of shares authorized (in shares)		31,600,000
Common stock payroll deduction price percentage of lover of fair market value (in percent)		85%
Employee payroll deduction limit		15%
Maximum employee stock purchase (in shares)		3,000

Stockholders' Equity - Common S

Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) shares in Thousands	Dec. 28, 2024 shares
Share-Based Payment Arrangement [Abstract]
Outstanding stock options and awards (in shares)	16,243
Reserved for future option and award grants (in shares)	9,709
Reserved for future ESPP (in shares)	1,098
Total common stock reserved for stock options and awards (in shares)	27,050

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Company's Equity Award Activity - RSUs (Details) - RSUs - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Number of Restricted Stock Units
Number of units, beginning balance (in shares)	11,536	12,588	11,607
Number of units granted (in shares)	9,093	6,990	8,897
Number of units released (in shares)	(6,378)	(7,496)	(6,690)
Number of units canceled (in shares)	(1,519)	(546)	(1,226)
Number of units, ending balance (in shares)	12,732	11,536	12,588
Weighted-Average Grant Date Fair Value Per Share
Weighted-average grant date fair value per share, beginning balance (in usd per share)	$ 7.45	$ 8.13	$ 7.66
Weighted-average grant date fair value per share, granted (in usd per share)	4.88	6.97	8.26
Weighted-average grant date fair value per share, released (in usd per share)	7.66	8.1	7.52
Weighted-average grant date fair value per share, canceled (in usd per share)	6.41	8.01	7.89
Weighted-average grant date fair value per share, ending balance (in usd per share)	$ 5.64	$ 7.45	$ 8.13
Aggregate Intrinsic Value
Aggregate intrinsic value , beginning balance	$ 54,802	$ 84,847	$ 110,849
Aggregate intrinsic value, RSUs released	37,123	43,001	46,104
Aggregate intrinsic value , ending balance	$ 83,649	$ 54,802	$ 84,847

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Company's Equity Award Activity - PSUs (Details) - Performance stock units - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Number of Performance Stock Units
Number of units, beginning balance (in shares)	3,653	2,559	2,114
Number of units granted (in shares)	1,224	1,835	899
Number of units released (in shares)	(405)		(335)
Number of units canceled (in shares)	(961)	(741)	(119)
Number of units, ending balance (in shares)	3,511	3,653	2,559
Weighted-Average Grant Date Fair Value Per Share
Weighted-average grant date fair value per share, beginning balance (in usd per share)	$ 7.63	$ 7.40	$ 6.66
Weighted-average grant date fair value per share, granted (in usd per share)	6.80	7.26	8.38
Weighted-average grant date fair value per share, released (in usd per share)	8.61		5.40
Weighted-average grant date fair value per share, canceled (in usd per share)	7.19	5.94	7.19
Weighted-average grant date fair value per share, ending balance (in usd per share)	$ 7.34	$ 7.63	$ 7.40
Aggregate Intrinsic Value
Aggregate intrinsic value , beginning balance	$ 17,352	$ 17,251	$ 20,184
Aggregate intrinsic value , PSUs released	2,047		2,592
Aggregate intrinsic value , ending balance	$ 23,068	$ 17,352	$ 17,251

Stockholders' Equity - Total St

Stockholders' Equity - Total Stock Based Compensation Cost for Instruments Granted but Not Yet Amortized (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2024 USD ($)
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense, Net	$ 52,350
Weighted- Average Period (in years)	1 year 6 months 25 days
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense, Net	$ 7,281
Weighted- Average Period (in years)	1 year 11 months 1 day

Stockholders' Equity - Valuatio

Stockholders' Equity - Valuation Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life		6 months	6 months
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Dividend yield (percent)	0%
Minimum | Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility		60%	39%
Risk-free interest rate		3.12%	0.67%
Estimated fair value, (in usd per share)		$ 1.91	$ 1.91
Minimum | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	53.28%
Historical volatility of Infinera common stock	0.4740
Risk-free interest rate	4.25%
Expected life	2 years 6 months 7 days
Maximum | Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility		63%	63%
Risk-free interest rate		4.98%	3.12%
Estimated fair value, (in usd per share)		$ 2.37	$ 2.21
Maximum | Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	58.30%
Historical volatility of Infinera common stock	0.4858
Risk-free interest rate	4.50%
Expected life	2 years 9 months 14 days

Stockholders' Equity - Summar_3

Stockholders' Equity - Summary of Employee Stock Purchase Plan Activity (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 50,921	$ 62,150	$ 61,015
Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	3,798	5,551
Employee contributions	$ 0	$ 14,930	$ 15,189
Shares purchased	0	3,514	2,552

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award (Details)	12 Months Ended
	Dec. 28, 2024
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Dividend yield (percent)	0%

Stockholders' Equity - Schedu_2

Stockholders' Equity - Schedule of Nonvested Performance Based Units Activity By Grant Year (Details) - Performance stock units - shares shares in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, beginning balance (in shares)	3,653	2,559	2,114
Number of performance stock units, granted (in shares)	1,224	1,835	899
Number of performance stock units, released (in shares)	(405)		(335)
Number of performance stock units, canceled (in shares)	(961)	(741)	(119)
Number of units, ending balance (in shares)	3,511	3,653	2,559
2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, beginning balance (in shares)	350
Number of performance stock units, granted (in shares)	0
Number of performance stock units, released (in shares)	0
Number of performance stock units, canceled (in shares)	(350)
Number of units, ending balance (in shares)	0	350
2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, beginning balance (in shares)	602
Number of performance stock units, granted (in shares)	0
Number of performance stock units, released (in shares)	(405)
Number of performance stock units, canceled (in shares)	(197)
Number of units, ending balance (in shares)	0	602
2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, beginning balance (in shares)	899
Number of performance stock units, granted (in shares)	0
Number of performance stock units, released (in shares)	0
Number of performance stock units, canceled (in shares)	(137)
Number of units, ending balance (in shares)	762	899
2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, beginning balance (in shares)	1,802
Number of performance stock units, granted (in shares)	0
Number of performance stock units, released (in shares)	0
Number of performance stock units, canceled (in shares)	(245)
Number of units, ending balance (in shares)	1,557	1,802
2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, beginning balance (in shares)	0
Number of performance stock units, granted (in shares)	1,224
Number of performance stock units, released (in shares)	0
Number of performance stock units, canceled (in shares)	(32)
Number of units, ending balance (in shares)	1,192	0

Stockholders' Equity - Schedu_3

Stockholders' Equity - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 50,921	$ 62,150	$ 61,015
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	49,731	52,723	54,102
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,199	$ 5,545	$ 1,636

Stockholders' Equity - Summar_4

Stockholders' Equity - Summary of Effects of Stock Based Compensation on Company's Statements of Balance Sheets and Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Effects Of Stock Based Compensation [Line Items]
Effects of stock based compensation	$ 1,795	$ 3,895	$ 3,979
Income tax benefit associated with stock-based compensation	9,133	8,165	8,588
Total stock-based compensation expense	50,921	62,150	61,015
Cost of revenue
Effects Of Stock Based Compensation [Line Items]
Total stock-based compensation expense	7,621	10,000	9,485
Research and development
Effects Of Stock Based Compensation [Line Items]
Total stock-based compensation expense	18,779	22,474	23,553
Sales and marketing
Effects Of Stock Based Compensation [Line Items]
Total stock-based compensation expense	12,175	13,699	13,311
General and administrative
Effects Of Stock Based Compensation [Line Items]
Total stock-based compensation expense	$ 12,346	$ 15,977	$ 14,666

Income Taxes - Loss Before Inco

Income Taxes - Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Domestic	$ (54,200)	$ 47,600	$ (75,700)
International	(78,800)	(65,000)	20,200
Loss before income taxes	$ (133,026)	$ (17,408)	$ (55,511)

Income Taxes - Geographic Break

Income Taxes - Geographic Breakdown of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Current:
Federal	$ 357	$ 1,278	$ 945
State	2,966	3,035	1,537
Foreign	14,200	5,672	20,616
Total current	17,523	9,985	23,098
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	(211)	(2,180)	(2,566)
Total deferred	(211)	(2,180)	(2,566)
Total provision for income taxes	$ 17,312	$ 7,805	$ 20,532

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Income Tax [Line Items]
Loss from international operations	$ 78,800	$ 65,000	$ (20,200)
Provision for income taxes	$ 17,312	$ 7,805	$ 20,532
Effective Income Tax Rate Reconciliation, Percent	(13.00%)	(44.80%)	(37.10%)
Expected tax at federal statutory rate	21%	21%	21%
Cumulative unrecognized tax benefit	$ 79,300	$ 74,171	$ 57,849	$ 54,250
Unrecognized tax benefits netted against deferred tax assets	70,800
Unrecognized tax benefits impact effective tax rate	10,500
Accrued interest or penalties related to unrecognized tax benefits	1,900	$ 1,500	$ 1,300
Scientific Research and Experimental Development (SRED) Credits
Income Tax [Line Items]
Tax credit carryforward	6,700
Portugal SIFIDE credit
Income Tax [Line Items]
Tax credit carryforward	4,900
Federal
Income Tax [Line Items]
Provision for income taxes	3,300
Operating loss carryforwards	393,100
Federal | Research Tax Credit Carryforward
Income Tax [Line Items]
Tax credit carryforward	61,100
State
Income Tax [Line Items]
Operating loss carryforwards	319,800
State | Research Tax Credit Carryforward
Income Tax [Line Items]
Tax credit carryforward	46,600
Foreign
Income Tax [Line Items]
Operating loss carryforwards	844,500
Tax credit carryforward	$ 35,100

Income Taxes - Provisions for I

Income Taxes - Provisions for Income Taxes Computed by Applying Statutory Federal Income Tax Rates (Details)	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Expected tax at federal statutory rate	21%	21%	21%
State taxes, net of federal benefit	(0.90%)	(15.50%)	(2.30%)
Tax credits	5.60%	37.90%	(10.20%)
Stock-based compensation	(3.60%)	(42.30%)	(10.20%)
Change in valuation allowance	(23.30%)	20.70%	(19.10%)
Foreign rate differential	(5.20%)	4.80%	(7.60%)
Non-deductible expenses	(0.60%)	(5.70%)	(16.10%)
Other taxes on foreign operations	(4.30%)	(24.10%)	(5.00%)
Return to provision	(0.50%)	44.20%	(3.70%)
Uncertain tax positions	(1.40%)	(3.60%)	(1.80%)
Prior year adjustment	0%	(4.40%)	(1.00%)
Other	0.20%	(2.00%)	(1.50%)
Effective tax rate	(13.00%)	(44.80%)	(37.10%)

Income Taxes - Deferred Income

Income Taxes - Deferred Income Taxes Differences Between Carrying Amounts of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Deferred tax assets:
Net operating losses	$ 278,932	$ 296,449
Research and foreign tax credits	142,844	137,130
Non-deductible accruals	56,755	63,763
R&D expense capitalization	84,945	65,125
Inventory valuation	13,908	13,612
Leasing Liabilities	20,772	23,917
Stock-based compensation	4,503	4,016
Property, plant and equipment	781	0
Total deferred tax assets	603,440	604,012
Valuation allowance	(580,577)	(576,998)
Net deferred tax assets	22,863	27,014
Deferred tax liabilities:
Property, plant and equipment	0	(281)
Right of use asset	(15,230)	(17,946)
Acquired intangible assets	(2,969)	(4,113)
Total deferred tax liabilities	(18,199)	(22,340)
Net deferred tax assets (liabilities)	$ 4,664	$ 4,674

Income Taxes - Aggregate Change

Income Taxes - Aggregate Changes in Balance of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 74,171	$ 57,849	$ 54,250
Tax position related to current year
Additions	1,020	1,417	1,536
Tax positions related to prior years
Additions	6,167	20,638	7,220
Reductions	(1,948)	(5,578)	(4,832)
Lapses of statute of limitations	(110)	(155)	(325)
Ending balance	$ 79,300	$ 74,171	$ 57,849

Segment Information - Narrative

Segment Information - Narrative (Details)	12 Months Ended
	Dec. 28, 2024 segment
Segment Reporting [Abstract]
Number of reportable segments	1
Number of operating segments	1

Segment Information - GAAP Reco

Segment Information - GAAP Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Loss from operations	$ (83,650)	$ (4,840)	$ (60,157)
Stock-based compensation expense	50,921	62,150	61,015
Amortization of acquired intangible assets	9,000	23,000	37,700
Restructuring and other related costs	4,782	8,935
Merger-related charges	23,021	0	0
Reportable Segment
Segment Reporting Information [Line Items]
Loss from operations	(83,650)	(4,840)	(60,157)
Stock-based compensation expense	50,921	62,150	61,015
Amortization of acquired intangible assets	9,025	22,965	37,714
Restructuring and other related costs	4,782	8,935	10,344
Merger-related charges	23,021	0	0
Inventory related charges	0	0	14,381
Global distribution center transition costs	0	0	2,109
Warehouse fire loss (recovery)	0	(1,985)	2,232
Litigation charges	0	0	1,350
Non-GAAP as adjusted	$ 4,099	$ 87,225	$ 68,988

Segment Information - Property,

Segment Information - Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Segment Reporting Information [Line Items]
Total property, plant and equipment, net	$ 249,496	$ 206,997
United States
Segment Reporting Information [Line Items]
Total property, plant and equipment, net	232,041	188,684
Other Americas
Segment Reporting Information [Line Items]
Total property, plant and equipment, net	3,894	2,777
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total property, plant and equipment, net	8,779	9,973
Asia Pacific
Segment Reporting Information [Line Items]
Total property, plant and equipment, net	$ 4,782	$ 5,563

Employee Benefit and Pension _3

Employee Benefit and Pension Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Postretirement costs	$ 5.1	$ 4.8	$ 4.9
401(k) Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Cash contribution	3	3	3
ITP Pension Plan | Transmode
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pension expense	$ 2.3	$ 2.2	$ 2.5

Employee Benefit and Pension _4

Employee Benefit and Pension Plans - Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 85,157	$ 76,172
Service cost	126	163	$ 300
Interest cost	2,840	3,103	1,249
Benefits paid	(3,951)	(4,700)
Actuarial loss (gain)	(854)	7,156
Employee contributions	22	18
Foreign currency exchange rate changes	(5,278)	3,245
Benefit obligation at end of year	78,062	85,157	76,172
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	76,577	66,455
Actual return on plan assets	9,340	7,793
Payments	(7,086)	(767)
Employee contributions	22	124
Employer contributions	96	78
Foreign currency exchange rate changes	(4,581)	2,894
Fair value of plan assets at end of year	74,368	76,577	$ 66,455
Net liability recognized	3,694	8,580
Accumulated benefit obligation	$ 77,600	$ 84,700

Employee Benefit and Pension _5

Employee Benefit and Pension Plans - Pension Plan Assets (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Retirement Benefits [Abstract]
Other non-current assets	$ 74,368	$ 76,577
Other long-term liabilities	(78,062)	(85,157)
Net liability recognized	$ (3,694)	$ (8,580)

Employee Benefit and Pension _6

Employee Benefit and Pension Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 126	$ 163	$ 300
Interest cost	$ 2,840	$ 3,103	$ 1,249
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Operating Expenses	Operating Expenses	Operating Expenses
Expected return on plan assets	$ (2,930)	$ (2,639)	$ (2,936)
Amortization of net actuarial (gain) loss	(439)	(413)	326
Total net periodic (benefit) cost	$ (403)	$ 214	$ (1,061)

Employee Benefit and Pension _7

Employee Benefit and Pension Plans - Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2025	Dec. 28, 2024	Dec. 30, 2023
Defined Benefit Plan, Accumulated Other Comprehensive Income, Before Tax Roll Forward [Roll Forward]
Beginning balance	$ 31,665	$ 24,746	$ 27,161
Net actuarial (gain) loss arising in current year		7,358	(2,002)
Amortization of net actuarial (gain) loss		(439)	(413)
Ending balance		31,665	24,746
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial (gain) loss		$ 439	$ 413
Forecast
Defined Benefit Plan, Accumulated Other Comprehensive Income, Before Tax Roll Forward [Roll Forward]
Amortization of net actuarial (gain) loss	1,400
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial (gain) loss	$ (1,400)

Employee Benefit and Pension _8

Employee Benefit and Pension Plans - Weighted Average Assumptions (Details)	Dec. 28, 2024	Dec. 30, 2023
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.48%	3.51%
Salary growth rate	2.25%	2.50%
Pension growth rate	2%	2.25%
Expected long-term rate of return on plan assets	3.93%	3.93%

Employee Benefit and Pension _9

Employee Benefit and Pension Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	$ 74,368	$ 76,577	$ 66,455
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	661	677
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	73,707	75,900
Cash
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	661	677
Cash | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	661	677
Cash | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Equity fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	50,656	51,226
Equity fund | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Equity fund | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	50,656	51,226
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	23,051	24,674
Insurance contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Insurance contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	$ 23,051	$ 24,674

Employee Benefit and Pension_10

Employee Benefit and Pension Plans - Estimated Future Payments (Details) $ in Thousands	Dec. 28, 2024 USD ($)
Retirement Benefits [Abstract]
2025	$ 5,779
2026	4,191
2027	3,854
2028	4,336
2029	4,202
2030 to 2034	$ 22,684

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Jan. 16, 2025 USD ($)
Subsequent Event
Subsequent Event [Line Items]
Government grant amount	$ 93

Schedule II_ Valuation and Qu_2

Schedule II: Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Deferred tax asset, valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 576,998	$ 548,257	$ 521,620
Additions	22,934	49,481	41,782
Reductions/Write-offs	(19,355)	(20,740)	(15,145)
Ending balance	580,577	576,998	548,257
Allowance for credit losses
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	876	1,422	1,304
Additions	1,324	521	1,762
Reductions/Write-offs	(1,398)	(473)	(1,279)
Recoveries during the period	0	(594)	(365)
Ending balance	$ 802	$ 876	$ 1,422