XML 110 R92.htm IDEA: XBRL DOCUMENT v3.5.0.2
Common Stock Repurchase Program (Detail) - USD ($)
 12 Months Ended
May 01, 2016
May 03, 2015
Apr. 27, 2014
Jun. 15, 2016
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 0    
Cost of common stock repurchased $ 2,400,000 $ 745,000      
Remaining authorized repurchase amount $ 1,900,000        
Common Stock Repurchase Program June 15, 2016 [Member] | common stock | Subsequent Event [Member]          
Stockholders Equity Note [Line Items]          
Authorization amount for repurchase of common stock       $ 5,000,000