Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 688,087	$ 465,232	$ 616,686
Cash flows from operating activities:
Net income	345,777	204,101	203,086
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	118,721	115,524	119,588
Amortization of debt discount and fees	1,196	1,211	1,069
Stock-based compensation	167,715	130,023	109,217
Gain on investments, net	(1,261)	(13,869)	(4,725)
Gain on sale of property, plant and equipment	0	0	(923)
Deferred income taxes	(11,676)	79,934	(4,869)
Provisions for losses on receivables	5,102	2,623	308
Other non-cash items	1,136	5,068	4,027
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(87,083)	(31,032)	(3,607)
Inventories	752	5,034	4,934
Prepaid expenses and other	(19,622)	(25,793)	(6,903)
Other assets	(16,077)	(22,336)	(6,566)
Accounts payable and accrued liabilities	1,553	(25,987)	2,655
Deferred revenue	100,696	33,614	30,742
Other long-term liabilities	(2,178)	12,625	(3,154)
Net cash provided by operating activities	604,751	470,740	444,879
Cash flows from investing activities:
Purchases of available-for-sale securities	0	0	(20,525)
Proceeds from the sale of available-for-sale securities	0	833	55,619
Proceeds from the maturity of available-for-sale securities	0	0	57,762
Purchases of non-marketable investments	(115,839)	0	0
Proceeds from the sale of non-marketable investments	3,497	9,108	2,917
Proceeds from the sale of property, plant and equipment	0	0	923
Purchases of property, plant and equipment	(61,503)	(57,901)	(53,712)
Cash paid in business combinations and asset acquisitions, net of cash acquired	0	(143,249)	(41,627)
Net cash provided by (used for) investing activities	(173,845)	(191,209)	1,357
Cash flows from financing activities:
Proceeds from revolving credit facility	100,000	135,000	115,000
Payment on revolving credit facility	(85,000)	(100,000)	(65,000)
Proceeds from term loan	0	0	300,000
Principal payments on term loan	(300,000)	0	0
Payment of debt issuance costs	0	(793)	(622)
Proceeds from issuance of common stock	40,908	48,965	55,440
Stock received for payment of employee taxes on vesting of restricted stock	(69,921)	(57,161)	(37,226)
Payments for repurchases of common stock	(250,059)	(100,025)	(960,289)
Change in book overdraft	(3,867)	3,867	0
Net cash used for financing activities	(567,939)	(70,147)	(592,697)
Effect of exchange rate changes on cash and cash equivalents	(17,756)	13,471	(4,993)
Increase (decrease) in cash and cash equivalents	(154,789)	222,855	(151,454)
Cash and cash equivalents at end of year	533,298	688,087	465,232
Supplemental cash flow information:
Cash paid for interest	23,018	24,160	21,024
Cash paid for income taxes, net	$ 68,040	$ 59,072	$ 36,823