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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2014
May. 04, 2013
Oct. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Estimated replacement cost   $ 672,000  
Replacement cost charged against reserve     $ 381,000
Other accrued expenses     $ 291,000
Amount received from supplier for recovery $ 450,000    
Lower product prices period     Through fiscal 2017