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Stock Options and Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 26, 2015
Apr. 30, 2021
Apr. 30, 2020
Aug. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred income tax benefit   $ (242) $ (2,431)  
Vesting period (in years)   4 years    
Awards granted (in shares)   0 0  
Stock based compensation expense   $ 15 $ 58  
Deferred income tax benefit   $ 3 14  
2010 and 2008 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants (in shares)   0    
2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants (in shares)   167,136   280,100
2017 Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 578 152  
Deferred income tax benefit   $ 136 $ 36  
Vesting period (in years)   3 years    
Remaining estimated compensation expense   $ 669    
2008 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized under stock option plan (in shares)   300,000    
Increase in number of shares available under stock option plan (in shares) 300,000      
Awards granted (in shares)   0    
2008 Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Terms of award (in years)   10 years