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Common Stock Repurchase Program (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jan. 31, 2016
May. 03, 2015
Feb. 25, 2014
Stockholders Equity Note [Line Items]      
Cost of common stock repurchased $ 2,397,000 $ 745,000  
Common Stock      
Stockholders Equity Note [Line Items]      
Common stock repurchased 100,776 43,014  
Cost of common stock repurchased $ 5,000 $ 2,000  
Common Stock Repurchase Program February 25, 2014 [Member] | Common Stock      
Stockholders Equity Note [Line Items]      
Authorization amount for repurchase of common stock     $ 5,000,000
Common stock repurchased 100,776 43,014  
Cost of common stock repurchased $ 2,397,000 $ 745,000  
Remaining authorized repurchase amount $ 1,900,000