Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended
	Jul. 30, 2011	Jul. 30, 2011	Jul. 31, 2010	Jan. 29, 2011
Income Taxes
Effective income tax rates (as a percent)		33.40%	30.50%
Settlement charge	$ 19,463,000	$ 19,463,000
Effective income tax rate basis point increase		260
Aggregate accruals for uncertain tax positions, including penalties and interest and net of federal tax benefits	$ 17,900,000	$ 17,900,000		$ 17,000,000