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Stock-Based Compensation - Narrative (Detail) - USD ($)
12 Months Ended
Apr. 30, 2023
May 01, 2022
May 02, 2021
Sep. 16, 2015
Time Based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining unrecognized compensation cost $ 759,000      
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 6 months      
Fair value of units expected to vest $ 1,600,000      
Selling, General and Administrative Expenses [Member] | Time Based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 808,000 $ 893,000 $ 614,000  
Selling, General and Administrative Expenses [Member] | Performance Based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 2,000 (81,000) 357,000  
Selling, General and Administrative Expenses [Member] | Common Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 335,000 $ 321,000 $ 280,000  
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 224,266