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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Cash flows from operating activities:    
Net income $ 111,951 $ 105,557
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 9,892 8,655
Deferred income taxes 1,071 6,168
Depreciation 16,083 12,783
Amortization of intangibles 12,557 10,167
In-process research and development   5,000
Change in operating assets and liabilities:    
Decrease in accounts receivable 40,588 35,110
Increase in inventories (28,101) (10,473)
Increase in other current assets (13,049) (4,057)
Increase in other assets (1,393) (1,040)
Decrease in accounts payable and other current liabilities (24,824) (50,072)
Increase in deferred revenue and customer advances 45,096 50,616
Increase in other liabilities 5,970 5,795
Net cash provided by operating activities 175,841 174,209
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (15,992) (17,711)
Investment in unaffiliated company (3,215) (7,000)
Purchases of investments (170,041) (823,335)
Maturities and sales of investments 1,085,087 750,997
Net cash provided by (used in) investing activities 895,839 (97,049)
Cash flows from financing activities:    
Proceeds from debt issuances 81 40,000
Payments on debt (750,000) (12)
Proceeds from stock plans 24,287 38,259
Purchases of treasury shares (282,370) (89,173)
Proceeds from (payments for) derivative contracts 1,937 (1,438)
Net cash used in financing activities (1,006,065) (12,364)
Effect of exchange rate changes on cash and cash equivalents 8,588 14,017
Increase in cash and cash equivalents 74,203 78,813
Cash and cash equivalents at beginning of period 642,319 505,631
Cash and cash equivalents at end of period $ 716,522 $ 584,444