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Stock-Based Compensation - Narrative (Detail) - USD ($)
3 Months Ended
Jul. 13, 2017
Jul. 14, 2016
Jul. 29, 2018
Jul. 30, 2017
Sep. 16, 2015
Performance Based Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining unrecognized compensation cost     $ 456,000    
Weighted average period over which unrecognized compensation cost is expected to be recognized     1 year 4 months 24 days    
Performance Based Restricted Stock Units [Member] | Employee [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted Stock Awarded [1],[2] 44,000        
Vesting Period [2] 3 years        
Price Per Share [2],[3] $ 32.50        
Time Vested Restricted Stock Units [Member] | Employee [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted Stock Awarded 1,200 1,200      
Vesting Period 11 months 11 months      
Price Per Share $ 32.50 $ 28      
Number of shares vested     1,200 1,200  
Weighted average fair value of vested shares     $ 39,000 $ 34,000  
Weighted average fair value of vested shares, per share     $ 32.50 $ 28  
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     $ (506,000) $ 751,000  
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     $ 5,000 $ 6,000  
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     1,026,651    
2007 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for future equity based grants         0
[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 key employees.
[3] Price per share represents the closing price of our common stock on the date of grant.