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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Cash flows from operating activities:    
Net income $ 148,127 $ 53,562
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 8,305 9,196
Deferred income taxes 2,787 (2,525)
Depreciation 16,343 15,708
Amortization of intangibles 15,013 13,480
Change in operating assets and liabilities:    
Decrease in accounts receivable 7,945 54,026
Increase in inventories (30,544) (29,399)
Increase in other current assets (3,080) (5,036)
(Increase) decrease in other assets (4,219) 2,745
Decrease in accounts payable and other current liabilities (29,758) (15,825)
Increase in deferred revenue and customer advances 89,048 46,465
(Decrease) increase in other liabilities (1,563) 9,238
Net cash provided by operating activities 218,404 151,635
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (39,503) (51,130)
Business acquisitions, net of cash acquired 0 (76,664)
Purchases of investments (122,640) (3,520)
Maturities and sales of investments 3,139 1,139
Net cash used in investing activities (159,004) (130,175)
Cash flows from financing activities:    
Proceeds from debt issuances 500,000 315,000
Payments on debt (150,000) (100,366)
Payments of debt issuance costs (3,637) 0
Proceeds from stock plans 16,295 11,743
Purchases of treasury shares (173,305) (196,226)
(Payments for) proceeds from derivative contracts (578) 2,767
Net cash provided by financing activities 188,775 32,918
Effect of exchange rate changes on cash and cash equivalents (1,087) (32)
Increase in cash and cash equivalents 247,088 54,346
Cash and cash equivalents at beginning of period 436,695 335,715
Cash and cash equivalents at end of period $ 683,783 $ 390,061