Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 932,161	$ 536,260	$ 726,357
Cash flows from operating activities:
Net income	252,417	158,898	164,243
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	118,165	115,634	98,308
Amortization of debt discount and fees	9,402	20,529	25,384
Stock-based compensation	92,341	83,792	66,285
Gain on investments, net	(2,124)	(4,707)	(5,311)
Deferred income taxes	(13,148)	12,478	(2,366)
Other non-cash items	646	6,854	3,932
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(44,732)	(17,925)	(3,609)
Inventories	(1,120)	(11,708)	(14,594)
Prepaid expenses and other	(1,380)	(2,501)	30,368
Other assets	(1,558)	(42,181)	(2,530)
Accounts payable and accrued liabilities	15,321	3,856	41,727
Deferred revenue	(27,019)	(11,860)	2,506
Other long-term liabilities	(19,011)	5,563	(36,738)
Net cash provided by operating activities	378,200	316,722	367,605
Cash flows from investing activities:
Purchases of available-for-sale securities	(96,531)	(124,165)	(111,702)
Proceeds from the sale of available-for-sale securities	60,949	85,384	77,621
Proceeds from the maturity of available-for-sale securities	31,316	46,612	38,706
Proceeds from the sale of long-term investments	4,570	1,085	6,234
Purchases of property, plant and equipment	(44,808)	(39,810)	(44,929)
Cash paid in business combinations and asset acquisitions, net of cash acquired	0	(167,121)	(392,825)
Net cash used for investing activities	(44,504)	(198,015)	(426,895)
Cash flows from financing activities:
Proceeds from issuance of debt	0	348,649	0
Proceeds from revolving credit facility	0	100,000	100,000
Payment on revolving credit facility	0	(100,000)	(100,000)
Payment of convertible notes	(349,999)	(1)	(144,639)
Payment of convertible notes embedded conversion derivative liability	(530,643)	(1)	0
Proceeds from convertible notes hedges	530,643	1	0
Principal payments on receivable financing	0	0	(2,526)
Payment of debt issuance costs	0	(6,500)	0
Payment of acquisition-related contingent consideration	0	(1,835)	(677)
Excess tax benefits from stock-based compensation	15,591	7,583	9,034
Proceeds from issuance of common stock	74,938	65,913	42,657
Stock received for payment of employee taxes on vesting of restricted stock	(33,651)	(24,727)	(20,140)
Payments for repurchases of common stock	(333,189)	(100,117)	0
Net cash provided by (used for) financing activities	(626,310)	288,965	(116,291)
Effect of exchange rate changes on cash and cash equivalents	(22,861)	(11,771)	(14,516)
Increase (decrease) in cash and cash equivalents	(315,475)	395,901	(190,097)
Cash and cash equivalents at end of year	616,686	932,161	536,260
Supplemental cash flow information:
Cash paid for interest	19,918	9,963	12,429
Cash paid (received) for income taxes, net	29,494	26,453	(3,084)
Non-cash investing and financing activities:
Stock options assumed in acquisitions	0	0	529
Available-for-sale securities received from customer	$ 0	$ 1,695	$ 240