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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 02, 2016
Apr. 04, 2015
Cash flows from operating activities:    
Net income $ 94,052 $ 96,061
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 15,841 8,455
Deferred income taxes 3,740 2,828
Depreciation 12,356 11,445
Amortization of intangibles 11,075 11,104
Change in operating assets and liabilities:    
Decrease in accounts receivable 38,254 24,961
Increase in inventories (20,488) (20,001)
Decrease (increase) in other current assets 1,037 (1,776)
Increase in other assets (3,421) (4,891)
Decrease in accounts payable and other current liabilities (43,632) (25,518)
Increase in deferred revenue and customer advances 45,586 42,555
Increase in other liabilities 5,486 9,367
Net cash provided by operating activities 159,886 154,590
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (24,652) (21,410)
Purchases of investments (685,568) (794,422)
Maturities and sales of investments 512,397 759,386
Net cash used in investing activities (197,823) (56,446)
Cash flows from financing activities:    
Proceeds from debt issuances 110,177 120,073
Payments on debt (60,000) (100,000)
Proceeds from stock plans 8,191 11,269
Purchases of treasury shares (95,489) (91,025)
Excess tax benefit related to stock option plans 1,619 2,757
Payments for derivative contracts (1,895) (3,348)
Net cash used in financing activities (37,397) (60,274)
Effect of exchange rate changes on cash and cash equivalents 4,056 (19,249)
(Decrease) increase in cash and cash equivalents (71,278) 18,621
Cash and cash equivalents at beginning of period 487,665 422,177
Cash and cash equivalents at end of period $ 416,387 $ 440,798