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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Apr. 02, 2022
Apr. 03, 2021
Cash flows from operating activities:    
Net income $ 159,831 $ 148,127
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 10,933 8,305
Deferred income taxes 4,175 2,787
Depreciation 17,209 16,343
Amortization of intangibles 15,455 15,013
Acquired in-process research and development and other non-cash items 9,381  
Change in operating assets and liabilities:    
(Increase) decrease in accounts receivable (907) 7,945
Increase in inventories (26,832) (30,544)
Increase in other current assets (1,805) (3,080)
Increase in other assets (13,491) (4,219)
Decrease in accounts payable and other current liabilities (69,548) (29,758)
Increase in deferred revenue and customer advances 91,514 89,048
Increase (decrease) in other liabilities 2,045 (1,563)
Net cash provided by operating activities 197,960 218,404
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (27,751) (39,503)
Proceeds from sale of equity investment 6,785  
Payments for intellectual property licenses (4,897)  
Purchases of investments (9,219) (122,640)
Maturities and sales of investments 54,074 3,139
Net cash provided by (used in) investing activities 18,992 (159,004)
Cash flows from financing activities:    
Proceeds from debt issuances   500,000
Payments on debt (70,000) (150,000)
Payments of debt issuance costs   (3,637)
Proceeds from stock plans 12,832 16,295
Purchases of treasury shares (170,136) (173,305)
Payments for derivative contracts (107) (578)
Net cash (used in) provided by financing activities (227,411) 188,775
Effect of exchange rate changes on cash and cash equivalents (10,705) (1,087)
(Decrease) increase in cash and cash equivalents (21,164) 247,088
Cash and cash equivalents at beginning of period 501,234 436,695
Cash and cash equivalents at end of period $ 480,070 $ 683,783