Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2014	May. 04, 2013	Aug. 01, 2015
Commitments and Contingencies Disclosure [Abstract]
Estimated replacement cost		$ 672,000
Replacement cost charged against reserve			$ 358,000
Other accrued expenses			$ 314,000
Amount received from supplier for recovery	$ 450,000
Lower product prices period			Through fiscal 2017