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Common Stock Repurchase Program (Detail) (USD $)
 3 Months Ended
Aug. 03, 2014
Jul. 28, 2013
Stockholders Equity Note [Line Items]    
Cost of common stock repurchased $ 556,000  
Common Stock
    
Stockholders Equity Note [Line Items]    
Common stock repurchased 32,269  
Cost of common stock repurchased 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 32,269 0
Cost of common stock repurchased $ 556,000