Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2014	May 04, 2013	Jul. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Estimated replacement cost		$ 672,000
Replacement cost charged against reserve	$ 411,000
Other accrued expenses			$ 261,000
Amount received from supplier for recovery	$ 450,000
Lower product prices period			Through fiscal 2017