Credit Facility (Details) (USD $)	3 Months Ended
	Aug. 02, 2014	Aug. 03, 2013	Jul. 12, 2012
Credit Facility
Credit agreement date	Jul. 12, 2012
Maximum availability under credit facility	$ 50,000,000
Maximum availability for letters of credit	10,000,000
Deferred financing costs			400,000
Minimum availability requirement as a percentage of borrowing base	10.00%
Minimum availability requirement per covenant	3,000,000
Ownership interest percentage held as collateral security	100.00%
Borrowings under the credit facility	0	0
Borrowing base	32,300,000
Open on-demand letters of credit	1,000,000
Net available borrowing capacity under the credit facility	28,000,000
Minimum
Credit Facility
Letters of credit fees (as a percent)	1.50%
Maximum
Credit Facility
Letters of credit fees (as a percent)	2.50%
Dividends allowed under credit facility	10,000,000
Additional one-time dividend allowable	$ 5,000,000
London Interbank Offered Rate (LIBOR) [Member]
Credit Facility
Credit Facility rate basis	LIBOR
London Interbank Offered Rate (LIBOR) [Member] | Minimum
Credit Facility
Basis spread on variable rate (as a percent)	2.00%
London Interbank Offered Rate (LIBOR) [Member] | Maximum
Credit Facility
Basis spread on variable rate (as a percent)	2.50%
Prime Rate [Member]
Credit Facility
Credit Facility rate basis	Prime Rate
Prime Rate [Member] | Minimum
Credit Facility
Basis spread on variable rate (as a percent)	1.00%
Prime Rate [Member] | Maximum
Credit Facility
Basis spread on variable rate (as a percent)	1.50%