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Common Stock Repurchase Program (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Nov. 02, 2014
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Apr. 29, 2012
Stockholders Equity Note [Line Items]          
Common stock repurchased 43,014        
Cost of common stock repurchased $ 745,000 $ 745,000   $ 5,022,000  
common stock          
Stockholders Equity Note [Line Items]          
Common stock repurchased   43,014   502,595  
Cost of common stock repurchased   $ 2,000   $ 25,000  
Remaining authorized repurchase amount   $ 4,300,000      
Common Stock Repurchase Program June 13, 2012 [Member] | common stock          
Stockholders Equity Note [Line Items]          
Authorization amount for repurchase of common stock       $ 5,000,000  
Common stock repurchased       502,595  
Cost of common stock repurchased       $ 5,000,000  
Common Stock Repurchase Program Fiscal 2012 [Member] | common stock          
Stockholders Equity Note [Line Items]          
Authorization amount for repurchase of common stock         $ 7,000,000
Cost of common stock repurchased         $ 5,400,000
Common Stock Repurchase Program August 29, 2012 [Member] | common stock          
Stockholders Equity Note [Line Items]          
Authorization amount for repurchase of common stock       $ 2,000,000  
Common stock repurchased       0  
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     0