Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of period	$ 536,260	$ 726,357
Cash flows from operating activities:
Net income	33,070	78,609
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,017	21,682
Amortization of debt discount and fees	4,882	6,281
Stock-based compensation	18,864	13,810
Gain on investments, net	(3,651)	(1,006)
Deferred income taxes	2,245	8,695
Other non-cash items	2,344	(1,007)
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(108)	23,652
Inventories	(9,373)	(979)
Prepaid expenses and other	(9,753)	(1,099)
Other assets	3,157	4,148
Accounts payable and accrued liabilities	(29,680)	(11,003)
Deferred revenue	(5,508)	(16,648)
Other long-term liabilities	(4,408)	(49,799)
Net cash provided by operating activities	28,098	75,336
Cash flows from investing activities:
Purchases of available-for-sale securities	(47,005)	(24,282)
Proceeds from the sale of available-for-sale securities	32,586	14,985
Proceeds from the maturity of available-for-sale securities	13,905	8,700
Proceeds from the sale of long-term investments	0	6,102
Purchases of property, plant and equipment	(6,252)	(6,569)
Cash paid in business combinations and asset acquisitions, net of cash acquired	(27,422)	(757)
Net cash used for investing activities	(34,188)	(1,821)
Cash flows from financing activities:
Principal payments on receivable financing	0	(2,526)
Payment of acquisition-related contingent consideration	(1,835)	(582)
Tax effect related to employee stock transactions allocated to equity	1,827	5,276
Proceeds from issuance of common stock	23,377	21,801
Stock received for payment of employee taxes on vesting of restricted stock	(10,981)	(8,775)
Payments for repurchases of common stock	(12,517)	0
Net cash provided by (used for) financing activities	(129)	15,194
Effect of exchange rate changes on cash and cash equivalents	2,720	(4,914)
Increase (decrease) in cash and cash equivalents	(3,499)	83,795
Cash and cash equivalents at end of period	532,761	810,152
Supplemental cash flow information:
Cash paid for interest	112	183
Cash paid for taxes, net	5,393	(21)
Non-cash investing and financing activities:
Available-for-sale securities received from customer	$ 0	$ 209