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Stock-Based Compensation - Narrative (Detail) - USD ($)
12 Months Ended
Jul. 18, 2019
[1]
Aug. 02, 2018
[1]
May 02, 2021
May 03, 2020
Apr. 28, 2019
Sep. 16, 2015
Time Vested Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining unrecognized compensation cost     $ 1,400,000      
Weighted average period over which unrecognized compensation cost is expected to be recognized     2 years 1 month 6 days      
Fair value of units expected to vest     $ 2,500,000      
Performance-Based Restricted Stock Units [Member] | Senior Executives [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares/units granted 93,653 [2] 86,599 [2] 0      
Performance-Based Restricted Stock Units [Member] | Key Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares/units granted 29,227 [3] 47,800 [3] 0      
Performance-Based Restricted Stock Units [Member] | Non-employee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares/units granted     0      
Performance Based Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining unrecognized compensation cost     $ 83,000      
Weighted average period over which unrecognized compensation cost is expected to be recognized     1 year      
Fair value of units expected to vest     $ 316,000      
Selling, General and Administrative Expenses [Member] | Time Vested Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense     614,000 $ 220,000 $ 43,000  
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     357,000 114,000 (53,000)  
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     $ 280,000 $ 280,000 $ 140,000  
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     661,553      
[1] Amounts represent the maximum number of common stock shares that could be earned if certain performance targets are met as defined in the related restricted stock unit agreements.
[2] Performance-based restricted stock units awarded to certain senior executives.
[3] Performance-based restricted stock units awarded to key employees.