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Stock Options and Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 26, 2015
Apr. 30, 2019
Apr. 30, 2018
Aug. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred income tax benefit   $ (27) $ (717)  
Vesting period   4 years    
Awards granted (in shares)   0 0  
Stock based compensation expense   $ 115 $ 172  
Deferred income tax benefit   27 42  
Compensation expense not yet recorded   76    
Deferred income tax on remaining compensation expense   $ 18    
2010 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants (in shares)   0    
Number of shares authorized under stock option plan (in shares)   100,000    
Number of shares each director can purchase (in shares)   10,000    
Terms of award   5 years    
Awards granted (in shares)   0    
2010 and 2008 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants (in shares)   272,178   280,100
2017 Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 34 141  
Deferred income tax benefit   $ 8 $ 34  
Vesting period   3 years    
Remaining estimated compensation expense   $ 158    
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    
Awards granted (in shares)   0    
Increase in number of shares available under stock option plan (in shares) 300,000      
2008 Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Terms of award   10 years