Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jul. 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	67,490	33,231
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,736	46,283
Amortization of debt discount and fees	11,529	14,587
Stock-based compensation	21,886	19,698
Gain on investments, net	(4,169)	(13,676)
Non-cash restructuring and other charges	125	136
Deferred income taxes	459	(4,811)
Provisions (recoveries) for losses (gains) on trade and installment contract receivables, net		(5,885)
Other non-cash items	3,439	2,518
Changes in operating assets and liabilities, net of effect of acquired businesses:
Current and long-term receivables	16,513	64,535
Inventories	499	(6,987)
Prepaid expenses and other	414	1,969
Other assets	(169)	1,479
Accounts payable and accrued liabilities	(4,694)	(48,650)
Deferred revenue	(27,446)	25,979
Other long-term liabilities	(1,424)	(4,628)
Net cash provided by operating activities	128,188	125,778
Cash Flows from Investing Activities:
Proceeds from the sale and maturity of available-for-sale securities	136	9,588
Purchases of available-for-sale securities	(49,083)
Proceeds from the sale of long-term investments	44	2,785
Purchases of property, plant and equipment	(18,269)	(11,312)
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)	(22,865)
Net cash used for investing activities	(68,463)	(22,412)
Cash Flows from Financing Activities:
Principal payments on receivable sale financing	(2,907)	(2,829)
Tax effect related to employee stock transactions allocated to equity	4,075	967
Payment of acquisition-related contingent consideration	(39)
Proceeds from issuance of common stock	13,063	10,302
Stock received for payment of employee taxes on vesting of restricted stock	(9,897)	(7,389)
Net cash provided by financing activities	4,295	1,051
Effect of exchange rate changes on cash and cash equivalents	(3,964)	3,491
Increase in cash and cash equivalents	60,056	107,908
Cash and Cash Equivalents at End of Period	$ 661,658	$ 665,317