Stockholders' Equity (Details) (USD $)	1 Months Ended			3 Months Ended
	Apr. 29, 2012	Oct. 31, 2011	Jul. 31, 2010	Mar. 31, 2012	Apr. 02, 2011
Stockholders' Equity
Stock issuances under employee plans, net of shares withheld for taxes (in shares)				800,000
Shares withheld to satisfy employee tax obligation				200,000
Value of common stock board of directors authorized to repurchase	$ 100,000,000	$ 50,000,000	$ 150,000,000
Common stock repurchased (in shares)					14,000
Repurchases of common stock					600,000
Components of accumulated other comprehensive loss, net of taxes
Unrealized Losses on Cash Flow Hedges, balance at beginning of period	(1,103,000)			(1,299,000)
Unrealized Losses on Cash Flow Hedges, Change associated with current period transactions, net of tax				282,000
Unrealized Losses on Cash Flow Hedges, Amount reclassified into earnings, net of tax				(86,000)
Unrealized Losses on Cash Flow Hedges, balance at end of period				(1,103,000)
Net Unrealized Losses on Available-For-Sale Securities, balance at beginning of period	(714,000)			(1,168,000)
Net Unrealized Losses on Available-For-Sale Securities, Change associated with current period transactions, net of tax				454,000
Net Unrealized Losses on Available-For-Sale Securities, balance at end of period				(714,000)
Accumulated other comprehensive income (loss), balance at beginning of period	(1,817,000)			(2,467,000)
Change associated with current period transactions, net of tax, total				736,000
Amount reclassified into earnings, net of tax, total				(86,000)
Accumulated other comprehensive income (loss), balance at end of period				$ (1,817,000)