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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Cash flows from operating activities:    
Net income $ 222,269 $ 201,718
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 24,237 16,610
Deferred income taxes 637 542
Depreciation 26,055 22,766
Amortization of intangibles 22,022 22,372
Change in operating assets and liabilities, net of acquisitions:    
Decrease in accounts receivable 32,318 15,842
Increase in inventories (25,003) (27,678)
Decrease (increase) in other current assets 2,812 (9,596)
Increase in other assets (3,517) (9,397)
Decrease in accounts payable and other current liabilities (41,100) (22,287)
Increase in deferred revenue and customer advances 46,801 43,352
Increase in other liabilities 9,374 13,305
Net cash provided by operating activities 316,905 267,549
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (49,696) (45,293)
Business acquisitions, net of cash acquired   (9,408)
Purchases of investments (1,205,035) (1,328,292)
Maturities and sales of investments 987,060 1,118,485
Net cash used in investing activities (267,671) (264,508)
Cash flows from financing activities:    
Proceeds from debt issuances 400,177 195,073
Payments on debt (310,239) (100,019)
Payments of debt issuance costs (1,705) (2,309)
Proceeds from stock plans 23,272 24,777
Purchases of treasury shares (172,392) (170,958)
Excess tax benefit related to stock option plans 3,517 5,689
Payments for derivative contracts (7,531) (805)
Net cash used in financing activities (64,901) (48,552)
Effect of exchange rate changes on cash and cash equivalents (8,616) (10,791)
Decrease in cash and cash equivalents (24,283) (56,302)
Cash and cash equivalents at beginning of period 487,665 422,177
Cash and cash equivalents at end of period $ 463,382 $ 365,875