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Common Stock Repurchase Program (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 02, 2020
Jan. 27, 2019
Oct. 28, 2018
Jul. 29, 2018
Feb. 02, 2020
Jan. 27, 2019
Mar. 04, 2020
Sep. 05, 2019
Stockholders Equity Note [Line Items]                
Cost of common stock repurchase $ 728,000 $ 2,472,000 $ 772,000 $ 72,000        
Common Stock [Member]                
Stockholders Equity Note [Line Items]                
Common stock repurchased 55,750 123,543 33,890 2,990        
Cost of common stock repurchase $ 3,000 $ 6,000 $ 2,000          
Common Stock Repurchase Program June 15, 2016 [Member] | Common Stock [Member]                
Stockholders Equity Note [Line Items]                
Common stock repurchased           160,423    
Cost of common stock repurchase           $ 3,300,000    
Stock Repurchase Program September 5, 2019 [Member] | Common Stock [Member]                
Stockholders Equity Note [Line Items]                
Authorization amount for repurchase of common stock               $ 5,000,000
Common stock repurchased         55,750      
Cost of common stock repurchase         $ 728,000      
Remaining authorized repurchase amount $ 4,300,000       $ 4,300,000      
Stock Repurchase Program March 4, 2020 [Member] | Common Stock [Member]                
Stockholders Equity Note [Line Items]                
Authorization amount for repurchase of common stock             $ 5,000,000