Long-term Debt - Line of Credit (Details) (USD $)	6 Months Ended	12 Months Ended
	Jul. 30, 2011	Jan. 28, 2012	Apr. 30, 2011
Line of Credit Facility [Line Items]
Amended LOC Initiation Date	July 14, 2011
Maximum borrowing capacity		$ 200,000,000	$ 225,000,000
Expiration date		July 14, 2016
Amount to which maximum borrowing capacity can be increased		300,000,000
Amount of borrowing capacity available for letters of credit		100,000,000
Unused Line Fee percentage, lower range		0.375%
Unused Line Fee percentage, upper range		0.50%
Minimum Amount of Excess Availability Required		15,000,000
Percentage of Excess Availablity Required		10.00%
Amount of unamortized deferred debt acquisition costs		$ 3,916,000
Base Rate Loans [Member]
Line of Credit Facility [Line Items]
Interest margin, lower range (in hundredths)		1.00%
Interest margin, upper range (in hundredths)		1.50%
Interest rate during the period (in hundredths)		4.25%
Interest margin during the period (in hundredths)		1.00%
Eurodollar Rate Loans [Member]
Line of Credit Facility [Line Items]
Interest margin, lower range (in hundredths)		2.00%
Interest margin, upper range (in hundredths)		2.50%
Interest rate during the period (in hundredths)		2.27%
Interest margin during the period (in hundredths)		2.00%