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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Operating Activities:      
Net income $ 694,955 $ 510,814 $ 456,227
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 59,895 55,796 51,311
Amortization 26,357 30,544 27,049
Gain on sale of property and equipment (230) (503) (198)
Provision for doubtful accounts 1,021 4,136 (2,521)
Provision for obsolete and slow-moving inventories 31,071 26,458 23,257
Unrealized foreign currency losses 21,036 13,387 37,931
Deferred income taxes (90,725) 1,699 5,897
Stock compensation 44,735 41,250 26,290
Realized losses (gains) on marketable securities 991 (822) (55)
Changes in operating assets and liabilities, net of acquisitions:      
Accounts receivable (40,088) 9,000 22,473
Inventories (38,575) (2,455) (121,718)
Other current and non-current assets (21,608) 2,234 (107,360)
Accounts payable (17,240) (11,496) 36,079
Other current and non-current liabilities 5,627 44,766 20,742
Deferred revenue 15,329 (6,363) (43,338)
Deferred costs (18,266) (15,780) (585)
Income taxes payable (13,443) 3,017 (151,014)
Net cash provided by operating activities 660,842 705,682 280,467
Investing activities:      
Purchases of property and equipment (139,696) (90,960) (80,592)
Proceeds from sale of property and equipment 361 676 7,921
Purchase of intangible assets (12,232) (5,715) (3,889)
Purchase of marketable securities (587,656) (905,089) (915,921)
Redemption of marketable securities 635,311 957,350 919,141
Acquisitions, net of cash acquired (90,471) (77,945) (38,687)
Change in restricted cash (153) 146 48
Net cash used in investing activities (194,536) (121,537) (111,979)
Financing activities:      
Dividends (382,976) (481,452) (378,117)
Tax benefit from issuance of equity awards 1,692 (2,049)
Proceeds from issuance of treasury stock related to equity awards 21,860 18,648 17,073
Purchase of treasury stock related to equity awards (12,773) (7,331) (5,586)
Purchase of treasury stock under share repurchase plan (74,523) (93,233) (131,413)
Net cash used in financing activities (448,412) (561,676) (500,092)
Effect of exchange rate changes on cash and cash equivalents 26,711 (8,656) (31,594)
Net increase (decrease) in cash and cash equivalents 44,605 13,813 (363,198)
Cash and cash equivalents at beginning of year 846,883 833,070 1,196,268
Cash and cash equivalents at end of year 891,488 846,883 833,070
Supplemental disclosures of cash flow information      
Cash paid during the year for income taxes 106,146 115,548 252,885
Cash received during the year from income tax refunds 3,806 4,275 3,793
Supplemental disclosure of non-cash investing and financing activities      
Increase in accrued capital expenditures related to purchases of property and equipment 13,864 2,154
Change in marketable securities related to unrealized appreciation (depreciation) 4,979 (12,123) 1,867
Fair value of assets acquired 128,190 91,620 38,687
Liabilities assumed (29,587) (6,344)
Less: cash acquired (8,132) (7,331)
Cash paid for acquisitions, net of cash acquired $ 90,471 $ 77,945 $ 38,687