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Stock-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Oct. 01, 2018
Aug. 02, 2018
Oct. 02, 2017
Jul. 13, 2017
Jul. 14, 2016
Jul. 29, 2018
Jul. 30, 2017
Oct. 28, 2018
Oct. 29, 2017
Sep. 16, 2015
Performance Based Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Fair value of vested shares               $ 3,600 $ 3,900  
Remaining unrecognized compensation cost               $ 1,600    
Weighted average period over which unrecognized compensation cost is expected to be recognized               2 years 3 months 18 days    
Fair value of units expected to vest               $ 2,400    
Performance Based Restricted Stock Units [Member] | Employee [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares granted [1],[2]   47,800   44,000            
Vesting Period [2]   3 years   3 years            
Price Per Share [2],[3]   $ 24.35   $ 32.50            
Time Vested Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Remaining unrecognized compensation cost               $ 252    
Weighted average period over which unrecognized compensation cost is expected to be recognized               4 years 3 months 18 days    
Fair value of units expected to vest               $ 250    
Time Vested Restricted Stock Units [Member] | Employee [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Fair value of vested shares           $ 39 $ 34      
Number of shares granted   11,200   1,200 1,200          
Vesting Period       11 months 11 months          
Price Per Share   $ 24.35   $ 32.50 $ 28          
Number of shares vested           1,200 1,200      
Weighted average fair value of vested shares, per share           $ 32.50 $ 28      
Time Vested Restricted Stock Units [Member] | Employee [Member] | Requisite Service Period for 10,000 Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares granted   10,000                
Vesting Period   59 months                
Time Vested Restricted Stock Units [Member] | Employee [Member] | Requisite Service Period for 1,200 Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares granted   1,200                
Vesting Period   11 months                
Common Stock Awards [Member] | Outside Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares granted 3,600   4,800              
Price Per Share $ 23.45   $ 33.20              
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               (216) 1,400  
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               26 17  
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               $ 84,000 $ 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               941,528    
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.