Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2023	Oct. 02, 2022
Cash flows from operating activities:
Net income	$ 102,005	$ 160,214
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense	41,518	41,419
Depreciation of property, plant, and equipment	12,557	12,176
(Gain) loss on disposal of property, plant, and equipment	(2)	12
Amortization of intangible assets	2,428	2,468
Excess and obsolete inventory charges	1,703	2,728
Non-cash impact of write-offs related to fire (Note 17)	0	45,827
Amortization of discounts or premiums on investments	1,347	3,976
Realized (gain) loss on sale of investments	624	103
Change in deferred income taxes	(14,691)	(14,799)
Accounts receivable	(6,488)	31,018
Unbilled revenue	534	1,760
Inventories	(12,954)	(35,815)
Prepaid expenses and other current assets	(2,007)	(46,817)
Accounts payable	(3,986)	(21,577)
Accrued expenses	(13,214)	(23,813)
Accrued income taxes	(13,513)	(6,644)
Deferred revenue and customer deposits	(151)	20,882
Other	2,715	4,031
Net cash provided by (used in) operating activities	98,425	177,149
Cash flows from investing activities:
Purchases of investments	(174,330)	(77,760)
Maturities and sales of investments	402,160	215,876
Purchases of property, plant, and equipment	(16,062)	(15,605)
Net cash provided by (used in) investing activities	211,768	122,511
Cash flows from financing activities:
Net payments from issuance of common stock under stock plans	3,276	4,225
Repurchase of common stock	(59,640)	(178,387)
Payment of dividends	(36,209)	(33,837)
Net cash provided by (used in) financing activities	(92,573)	(207,999)
Effect of foreign exchange rate changes on cash and cash equivalents	(3,493)	(11,818)
Net change in cash and cash equivalents	214,127	79,843
Cash and cash equivalents at beginning of period	181,374	186,161
Cash and cash equivalents at end of period	$ 395,501	$ 266,004