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Common Stock Repurchase Program (Detail) (USD $)
 6 Months Ended
Nov. 02, 2014
Oct. 27, 2013
Stockholders Equity Note [Line Items]    
Cost of common stock repurchased $ 745,000  
Common Stock
    
Stockholders Equity Note [Line Items]    
Common stock repurchased 43,014  
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 43,014 0
Cost of common stock repurchased $ 745,000