Debt (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Aug. 03, 2013	Aug. 06, 2013
Credit Agreement
Line of credit facility
Borrowings under revolving credit facility	$ 0
Letters of credit issued and outstanding	21.5
Borrowings available under credit facility	278.5
Credit Agreement | Maximum
Line of credit facility
Varying interest rate margin (as a percent)	2.50%
Fees on amounts available to be drawn (as a percent)	2.50%
Fees on unused commitments (as a percent)	0.50%
Credit Agreement | Minimum
Line of credit facility
Fees on amounts available to be drawn (as a percent)	1.75%
Fees on unused commitments (as a percent)	0.35%
Credit Agreement | Alternate base rate based on the federal funds rate
Line of credit facility
Alternate base rate (as a percent)	federal funds rate
Base rate margin (as a percent)	0.50%
Credit Agreement | Alternate base rate based on the adjusted LIBOR rate
Line of credit facility
Alternate base rate (as a percent)	one month LIBO rate
Base rate margin (as a percent)	1.00%
Senior revolving credit facility
Line of credit facility
Total credit facility	300.0
Total credit facility with expansion feature	450.0
Term loan
Line of credit facility
Available term loan	100.0
Period after the closing date during which amount is available in single advance	120 days
Amount borrowed		$ 100.0
Period of repayment of term loan	5 years
Annual principal payment (as a percent)	10.00%