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Stock-Based Compensation - Summary of Vested Performance Based Restricted Stock Units (Detail) - Performance Based Restricted Stock Units [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jul. 29, 2018
Jul. 30, 2017
NEOs and Key Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock Shares Vested [1] 107,553 102,845
Weighted Average Fair Value [1],[2] $ 3,466 $ 1,820
Price Per Share [1],[3] $ 32.23 $ 17.70
Non-employee [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common Stock Shares Vested [4] 10,364 16,000
Weighted Average Fair Value [2],[4] $ 320 $ 520
Price Per Share [4],[5] $ 30.90 $ 32.50
[1] NEOs and key employees.
[2] Dollar amounts are in thousands.
[3] Price per share represents closing price of our common stock on the date of grant.
[4] Non-employee
[5] The respective grant vested during the first quarter of fiscal 2019 or 2018, respectively. Accordingly, the price per share represents the closing price of our common stock on the date the award vested.