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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Cash flows from operating activities:    
Net income $ 105,557 $ 94,052
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 8,655 15,841
Deferred income taxes 6,168 3,740
Depreciation 12,783 12,356
Amortization of intangibles 10,167 11,075
Excess tax benefit related to stock-based compensation plans   1,619
In-process research and development charge 5,000  
Change in operating assets and liabilities:    
Decrease in accounts receivable 35,110 38,254
Increase in inventories (10,473) (20,488)
(Increase) decrease in other current assets (4,057) 1,037
Increase in other assets (1,040) (3,421)
Decrease in accounts payable and other current liabilities (50,072) (43,632)
Increase in deferred revenue and customer advances 50,616 45,586
(Decrease) increase in other liabilities 5,795 5,486
Net cash provided by operating activities 174,209 161,505
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (17,711) (24,652)
Investment in unaffiliated company (7,000)  
Purchases of investments (823,335) (685,568)
Maturities and sales of investments 750,997 512,397
Net cash used in investing activities (97,049) (197,823)
Cash flows from financing activities:    
Proceeds from debt issuances 40,000 110,177
Payments on debt (12) (60,000)
Proceeds from stock plans 38,259 8,191
Purchases of treasury shares (89,173) (95,489)
Payments for derivative contracts (1,438) (1,895)
Net cash used in financing activities (12,364) (39,016)
Effect of exchange rate changes on cash and cash equivalents 14,017 4,056
Increase (decrease) in cash and cash equivalents 78,813 (71,278)
Cash and cash equivalents at beginning of period 505,631 487,665
Cash and cash equivalents at end of period $ 584,444 $ 416,387