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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Cash flows from operating activities:    
Net income $ 237,379 $ 222,269
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 17,794 24,237
Deferred income taxes 5,208 637
Depreciation 30,796 26,055
Amortization of intangibles 21,609 22,022
Excess tax benefit related to stock-based compensation plans   3,517
In-process research and development charge 5,000  
Change in operating assets and liabilities:    
Decrease in accounts receivable 41,945 32,318
Increase in inventories (19,169) (25,003)
(Increase) decrease in other current assets (9,253) 2,812
Increase in other assets (1,154) (3,517)
Decrease in accounts payable and other current liabilities (34,802) (41,100)
Increase in deferred revenue and customer advances 53,601 46,801
Increase in other liabilities 2,306 9,374
Net cash provided by operating activities 351,260 320,422
Cash flows from investing activities:    
Additions to property, plant, equipment and software capitalization (35,358) (49,696)
Investment in unaffiliated company (7,000)  
Payments for intellectual property licenses (5,000)  
Purchases of investments (1,554,769) (1,205,035)
Maturities and sales of investments 1,308,275 987,060
Net cash used in investing activities (293,852) (267,671)
Cash flows from financing activities:    
Proceeds from debt issuances 85,000 400,177
Payments on debt (64) (310,239)
Payments of debt issuance costs   (1,705)
Proceeds from stock plans 58,182 23,272
Purchases of treasury shares (165,834) (172,392)
Proceeds from (payments for) derivative contracts 430 (7,531)
Net cash used in financing activities (22,286) (68,418)
Effect of exchange rate changes on cash and cash equivalents 26,502 (8,616)
Increase (decrease) in cash and cash equivalents 61,624 (24,283)
Cash and cash equivalents at beginning of period 505,631 487,665
Cash and cash equivalents at end of period $ 567,255 $ 463,382