Line of Credit (Detail) (USD $)				9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Apr. 30, 2010	Oct. 27, 2012 LIBOR Rate [Member] Second Amended Credit Facility [Member] Minimum [Member]	Oct. 27, 2012 LIBOR Rate [Member] Second Amended Credit Facility [Member] Maximum [Member]	Oct. 27, 2012 Prime Rate [Member] Second Amended Credit Facility [Member] Minimum [Member]	Oct. 27, 2012 Prime Rate [Member] Second Amended Credit Facility [Member] Maximum [Member]	Oct. 27, 2012 Second Amended Credit Facility [Member] Minimum [Member]	Oct. 27, 2012 Second Amended Credit Facility [Member] Maximum [Member]	May 31, 2012 Second Amended Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			$ 100,000,000							$ 75,000,000
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)	64,400,000
Line of Credit Facility, Amount Outstanding (in Dollars)	$ 645,000	$ 1,200,000