Line of Credit (Detail) (USD $) In Millions, unless otherwise specified				6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Apr. 30, 2010	Jul. 28, 2012 LIBOR Rate [Member] Minimum [Member] Second Amended Credit Facility [Member]	Jul. 28, 2012 LIBOR Rate [Member] Maximum [Member] Second Amended Credit Facility [Member]	Jul. 28, 2012 Prime Rate [Member] Minimum [Member] Second Amended Credit Facility [Member]	Jul. 28, 2012 Prime Rate [Member] Maximum [Member] Second Amended Credit Facility [Member]	Jul. 28, 2012 Minimum [Member] Second Amended Credit Facility [Member]	Jul. 28, 2012 Maximum [Member] Second Amended Credit Facility [Member]	May 31, 2012 Second Amended Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			$ 100							$ 75
Line of Credit Facility, Interest Rate During Period				2.25%	2.75%	0.75%	1.25%
Line of Credit Facility, Commitment Fee Percentage								0.375%	0.50%
Line of Credit Facility, Capacity Available for Trade Purchases (in Dollars)	55.5
Line of Credit Facility, Amount Outstanding (in Dollars)	$ 0.7	$ 0.8