CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Cash flows from operating activities:
Net income	$ 82,387	$ 50,738	$ 83,924
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	30,603	28,646	25,772
Amortization	6,850	9,391	18,747
Amortization (accretion) of discount on investments	(2,828)	182	403
Reduction in the carrying amount of right-of-use assets	7,389	8,153	7,172
Stock-based compensation expense	38,616	31,337	29,384
Deferred income tax provision (benefit)	(12,100)	(6,343)	3,869
Gain on sale of business	(72,953)	0	0
Provision for excess and obsolete inventories	15,003	24,632	15,544
Acquired inventory step-up amortization	501	476	723
Loss on disposal of long-lived assets	0	296	449
Non-cash restructuring charges	0	200	1,646
Gain on contingent consideration	0	0	(95)
Foreign currency transaction losses	2,282	2,251	1,582
Other than temporary impairment on debt receivable	1,083	0	0
Changes in assets and liabilities:
Accounts receivable	(23,304)	26,028	(9,086)
Inventories	(9,488)	(28,780)	(31,655)
Prepaid expenses and other current assets	(3,057)	(4,591)	3,808
Other assets	(146)	66	(326)
Accounts payable	1,319	3,899	(6,589)
Accrued liabilities	(2,424)	(8,002)	(725)
Other liabilities	4,660	(63)	285
Deferred revenues	(10,176)	1,286	1,974
Deferred grant	18,000	0	0
Operating lease liabilities	(7,615)	(8,016)	(7,442)
Net cash provided by operating activities	64,602	131,786	139,364
Cash flows from investing activities:
Acquisition of property, plant and equipment	(56,027)	(65,254)	(66,496)
Acquisition of business, net of cash acquired	0	(3,350)	0
Proceeds from sale of business	101,785	0	0
Purchase of promissory note receivable	0	(1,000)	0
Purchases of marketable securities	(135,462)	(101,894)	(149,979)
Proceeds from maturities of marketable securities	118,753	95,794	91,734
Net cash provided by (used in) investing activities	29,049	(75,704)	(124,741)
Cash flows from financing activities:
Proceeds from issuances of common stock	8,822	10,499	10,653
Purchase of common stock through stock repurchase program	(19,801)	(82,328)	(24,038)
Tax withholdings related to net share settlements of equity awards	(10,687)	(15,705)	(20,604)
Payments on term loan	(1,045)	(8,398)	(9,337)
Payment of contingent consideration	0	0	3,873
Net cash used in financing activities	(22,711)	(95,932)	(47,199)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,649)	(2,510)	(3,180)
Net increase (decrease) in cash, cash equivalents and restricted cash	68,291	(42,360)	(35,756)
Cash, cash equivalents and restricted cash, beginning of year	112,982	155,342	191,098
Cash, cash equivalents and restricted cash, end of year	181,273	112,982	155,342
Supplemental disclosure of non-cash investing and financing activities:
Operating lease, right-of-use assets obtained in exchange for lease obligations	6,491	4,975	12,254
Increase (decrease) in accounts payable and accrued liabilities related to property, plant and equipment purchases	(5,961)	7,469	2,711
Supplemental disclosure of cash flow information:
Income taxes paid, net	17,385	10,917	7,957
Cash paid for interest, net	422	535	643
Operating cash outflows from operating leases	9,135	8,913	8,520
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	177,812	109,130	151,010
Restricted cash, current	1,152	1,221	2,233
Restricted cash	2,309	2,631	2,099
Total cash, cash equivalents and restricted cash	$ 181,273	$ 112,982	$ 155,342