Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Condensed Consolidated Statements of Cash Flows [Abstract]
Cash and Cash Equivalents at Beginning of Period	$ 601,602	$ 557,409
Cash Flows from Operating Activities:
Net income	31,104	6,323
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,939	22,907
Amortization of debt discount and fees	5,734	7,263
Stock-based compensation	11,525	9,357
Gain on investments, net	(1,949)	(4,447)
Non-cash restructuring and other charges	63	65
Deferred income taxes	223	65
Provisions (recoveries) for losses (gains) on trade and installment contract receivables, net		(5,197)
Other non-cash items	683	488
Changes in operating assets and liabilities, net of effect of acquired businesses:
Current and long-term receivables	60,172	37,642
Inventories	(154)	(4,016)
Prepaid expenses and other	(5,545)	(5,456)
Other assets	(577)	1,662
Accounts payable and accrued liabilities	(19,582)	(20,681)
Deferred revenue	(39,315)	15,607
Other long-term liabilities	(3,612)	(5,217)
Net cash provided by operating activities	60,709	56,365
Cash Flows from Investing Activities:
Proceeds from the sale of available-for-sale securities		1,497
Proceeds from the sale of long-term investments	44	2,677
Purchases of property, plant and equipment	(8,201)	(5,181)
Investment in venture capital partnerships and equity investments	(250)	(608)
Cash paid in business combinations and asset acquisitions, net of cash acquired, and acquisitions of intangibles	(1,041)	(2,538)
Net cash used for investing activities	(9,448)	(4,153)
Cash Flows from Financing Activities:
Principal payments on receivable sale financing		(2,829)
Tax effect related to employee stock transactions allocated to equity	2,842	160
Payment of acquisition-related contingent consideration	(39)
Proceeds from issuance of common stock	12,761	8,897
Stock received for payment of employee taxes on vesting of restricted stock	(6,173)	(2,854)
Net cash provided by financing activities	9,391	3,374
Effect of exchange rate changes on cash and cash equivalents	(2,567)	(787)
Increase in cash and cash equivalents	58,085	54,799
Cash and Cash Equivalents at End of Period	$ 659,687	$ 612,208