Stockholders' Equity (Details) (USD $) Share data in Millions	1 Months Ended			3 Months Ended		9 Months Ended
	Oct. 29, 2011	Jul. 31, 2010	Oct. 31, 2009	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Stockholders' Equity
Common stock issued during the period (in shares)						1.1
Shares withheld to satisfy employee tax obligation						0.2
Value of common stock board of directors authorized to repurchase	$ 50,000,000	$ 150,000,000	$ 150,000,000
Common stock repurchased (in shares)						3.2	3.3
Repurchases of common stock						110,000,000	140,300,000
Comprehensive Income
Net income				11,255,000	18,233,000	22,667,000	60,359,000
Net unrealized gains on available-for-sale securities, net of tax of $(104) and $(109) during the three months and $(152) and $(806) during the nine months ended October 1, 2011 and October 2, 2010, respectively				192,000	203,000	283,000	1,498,000
Net unrealized gains (losses) on cash flow hedges, net of tax of $(145) and $16 during the three months and $(450) and $89 during the nine months ended October 1, 2011 and October 2, 2010, respectively				270,000	(29,000)	835,000	(165,000)
Comprehensive income				11,717,000	18,407,000	23,785,000	61,692,000
Tax effect of net unrealized gains on available-for-sale securities				(104,000)	(109,000)	(152,000)	(806,000)
Tax effect of net unrealized gains (losses) on cash flow hedges				(145,000)	16,000	(450,000)	89,000
Components of accumulated other comprehensive loss, net of taxes
Unrealized Losses on Cash Flow Hedges, balance at beginning of period	(1,642,000)					(2,477,000)
Unrealized Losses on Cash Flow Hedges, Change associated with current period transactions, net of tax						(320,000)
Unrealized Losses on Cash Flow Hedges, Amount reclassified into earnings, net of tax						1,155,000
Unrealized Losses on Cash Flow Hedges, balance at end of period				(1,642,000)		(1,642,000)
Net Unrealized Losses on Available-For-Sale Securities, balance at beginning of period	(888,000)					(1,171,000)
Net Unrealized Losses on Available-For-Sale Securities, Change associated with current period transactions, net of tax						283,000
Net Unrealized Losses on Available-For-Sale Securities, balance at end of period				(888,000)		(888,000)
Accumulated other comprehensive income (loss), balance at beginning of period	(2,530,000)					(3,648,000)
Change associated with current period transactions, net of tax, total						(37,000)
Amount reclassified into earnings, net of tax, total						1,155,000
Accumulated other comprehensive income (loss), balance at end of period				$ (2,530,000)		$ (2,530,000)