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Stock-Based Compensation - Narrative (Detail) - USD ($)
12 Months Ended
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
May 01, 2016
Sep. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of options to purchase common stock outstanding 0 0 15,600 83,600  
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 995,094        
Performance Based Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining unrecognized compensation cost $ 328,000        
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 10 months 24 days        
Fair value of units expected to vest $ 712,000        
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 $ 0    
Aggregate intrinsic value for options exercised   393,000 1,700,000    
Time Based Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining unrecognized compensation cost $ 206,000        
Weighted average period over which unrecognized compensation cost is expected to be recognized 4 years 1 month 6 days        
Fair value of units expected to vest $ 207,000        
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 (53,000) 2,000,000 3,200,000    
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 140,000 159,000 143,000    
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 $ 43,000 $ 38,000 $ 29,000