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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Oct. 02, 2022
Oct. 03, 2021
Cash flows from operating activities:    
Net income $ 160,214 $ 226,346
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 41,419 33,353
Depreciation of property, plant, and equipment 12,176 12,641
Loss on disposal of property, plant, and equipment 12 4
Amortization of intangible assets 2,468 2,773
Excess and obsolete inventory charges 2,728 2,120
Non-cash impact of write-offs related to fire (Note 17) 45,827 0
Amortization of discounts or premiums on investments 3,976 3,316
Realized loss (gain) on sale of investments 103 (87)
Change in deferred income taxes (14,799) 1,411
Accounts receivable 31,018 (4,295)
Unbilled revenue 1,760 (1,689)
Inventories (35,815) (22,534)
Prepaid expenses and other current assets (46,817) (24,607)
Accounts payable (21,577) 10,576
Accrued expenses (23,813) 4,416
Accrued income taxes (6,644) (4,936)
Deferred revenue and customer deposits 20,882 16,751
Other 4,031 3,297
Net cash provided by operating activities 177,149 258,856
Cash flows from investing activities:    
Purchases of investments (77,760) (607,458)
Maturities and sales of investments 215,876 317,174
Purchases of property, plant, and equipment (15,605) (10,689)
Net cash provided by (used in) investing activities 122,511 (300,973)
Cash flows from financing activities:    
Net payments from issuance of common stock under stock plans 4,225 59,101
Repurchase of common stock (178,387) (48,294)
Payment of dividends (33,837) (31,800)
Net cash provided by (used in) financing activities (207,999) (20,993)
Effect of foreign exchange rate changes on cash and cash equivalents (11,818) (2,484)
Net change in cash and cash equivalents 79,843 (65,594)
Cash and cash equivalents at beginning of period 186,161 269,073
Cash and cash equivalents at end of period $ 266,004 $ 203,479