Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010
Cash flows from operating activities:
Net income	$ 139,599,000	$ 73,561,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	17,985,000	23,698,000
Equity-based compensation	11,060,000	8,155,000
Impairment of investments	326,000	0
Excess tax benefit from equity-based compensation	(1,265,000)	(83,000)
Loss (gain) on sale of assets	53,000	(58,000)
Gain on sale of business	(66,753,000)	0
Deferred income taxes	5,703,000	3,208,000
Changes in assets and liabilities:
Accounts receivable, net	(10,112,000)	(14,463,000)
Inventories, net	(6,635,000)	(15,972,000)
Other assets	(10,150,000)	(1,192,000)
Accounts payable	(8,493,000)	6,747,000
Accrued liabilities	(14,917,000)	13,861,000
Deferred revenue	(16,707,000)	(1,530,000)
Income taxes	(7,087,000)	9,197,000
Other operating activities	2,116,000	(3,391,000)
Net cash provided by operating activities	34,723,000	101,738,000
Cash flows from investing activities:
Purchases of property and equipment	(17,829,000)	(23,752,000)
Payments for patents and licensing arrangements	(200,000)	(2,882,000)
Proceeds from the sale of businesses	161,206,000	0
Purchases of investments and marketable securities	(791,811,000)	(312,201,000)
Maturities of investments and marketable securities	493,649,000	230,715,000
Sales of investments and marketable securities	253,377,000	74,371,000
Net cash provided (used) by investing activities	98,392,000	(33,749,000)
Cash flows from financing activities:
Purchase of treasury stock	(146,373,000)	(67,384,000)
Proceeds from exercise of stock options and stock purchase plan purchases	9,197,000	7,772,000
Excess tax benefit from equity-based compensation	1,265,000	83,000
Net cash (used) in financing activities	(135,911,000)	(59,529,000)
Effect of exchange rate changes on cash	(899,000)	44,000
Net increase (decrease) in cash and cash equivalents	(3,695,000)	8,504,000
Cash balance of discontinued operations at beginning of period	1,301,000	1,693,000
Less: Cash balance of discontinued operations at end of period	0	653,000
Cash and cash equivalents at beginning of period	46,175,000	37,250,000
Cash and cash equivalents at end of period	43,781,000	46,794,000
Supplemental disclosures of cash flow information:
Income taxes paid	$ 53,512,000	$ 9,764,000