Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 465,232	$ 616,686	$ 932,161
Cash flows from operating activities:
Net income	204,101	203,086	252,417
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	115,524	119,588	118,165
Amortization of debt discount and fees	1,211	1,069	9,402
Stock-based compensation	130,023	109,217	92,341
Gain on investments, net	(13,869)	(4,725)	(2,124)
Gain on sale of property, plant and equipment	0	(923)	0
Deferred income taxes	79,934	(4,869)	(13,148)
Other non-cash items	5,068	4,027	646
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(28,409)	(3,299)	(44,732)
Inventories	5,034	4,934	(1,120)
Prepaid expenses and other	(25,793)	(6,903)	(1,380)
Other assets	(22,336)	(6,566)	(1,558)
Accounts payable and accrued liabilities	(25,987)	2,655	15,321
Deferred revenue	33,614	30,742	(27,019)
Other long-term liabilities	12,625	(3,154)	(19,011)
Net cash provided by operating activities	470,740	444,879	378,200
Cash flows from investing activities:
Purchases of available-for-sale securities	0	(20,525)	(96,531)
Proceeds from the sale of available-for-sale securities	833	55,619	60,949
Proceeds from the maturity of available-for-sale securities	0	57,762	31,316
Proceeds from the sale of long-term investments	9,108	2,917	4,570
Proceeds from the sale of property, plant and equipment	0	923	0
Purchases of property, plant and equipment	(57,901)	(53,712)	(44,808)
Cash paid in business combinations and asset acquisitions, net of cash acquired	(143,249)	(41,627)	0
Net cash provided by (used for) investing activities	(191,209)	1,357	(44,504)
Cash flows from financing activities:
Proceeds from term loan	0	300,000	0
Proceeds from revolving credit facility	135,000	115,000	0
Payment on revolving credit facility	(100,000)	(65,000)	0
Payment of convertible notes	0	0	(349,999)
Payment of convertible notes embedded conversion derivative liability	0	0	(530,643)
Proceeds from convertible notes hedges	0	0	530,643
Payment of debt issuance costs	(793)	(622)	0
Excess tax benefits from stock-based compensation	0	0	15,591
Proceeds from issuance of common stock	48,965	55,440	74,938
Stock received for payment of employee taxes on vesting of restricted stock	(57,161)	(37,226)	(33,651)
Payments for repurchases of common stock	(100,025)	(960,289)	(333,189)
Change in book overdraft	3,867	0	0
Net cash used for financing activities	(70,147)	(592,697)	(626,310)
Effect of exchange rate changes on cash and cash equivalents	13,471	(4,993)	(22,861)
Increase (decrease) in cash and cash equivalents	222,855	(151,454)	(315,475)
Cash and cash equivalents at end of year	688,087	465,232	616,686
Supplemental cash flow information:
Cash paid for interest	24,160	21,024	19,918
Cash paid for income taxes, net	$ 59,072	$ 36,823	$ 29,494