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Stock-Based Compensation - Narrative (Detail) - USD ($)
12 Months Ended
May 03, 2020
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
Sep. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of options to purchase common stock outstanding       15,600  
Incentive Stock Option Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of options to purchase common stock outstanding 0        
Number of options exercisable 0        
Unrecognized compensation cost related to incentive stock options $ 0        
Share-based compensation expense   $ 0 $ 0    
Aggregate intrinsic value for options exercised     393,000    
Time Vested Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining unrecognized compensation cost $ 622,000        
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 years 4 months 24 days        
Fair value of units expected to vest $ 307,000        
Time Vested Restricted Stock Units [Member] | Selling, General and Administrative Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense 220,000 43,000 38,000    
Performance Based Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining unrecognized compensation cost $ 11,000        
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 months 12 days        
Fair value of units expected to vest $ 53,000        
Performance Based Restricted Stock Units [Member] | Selling, General and Administrative Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense 114,000 (53,000) 2,000,000    
Common Stock Awards [Member] | Selling, General and Administrative Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 280,000 $ 140,000 $ 159,000    
2015 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of common stock authorized for issuance         1,200,000
Number of shares available for future equity based grants 690,163