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Stock-Based Compensation - Summary of Vested Time Based Restricted Stock Units (Detail) - Time Based Restricted Stock Unit [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 28, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Units Vested | shares 1,200
Weighted Average Fair Value | $ $ 21 [1]
Price Per Share | $ / shares $ 17.36 [2]
[1] Dollar amounts are in thousands.
[2] The weighted average price per share is derived from the closing prices of our common stock on the dates the respective time-based restricted stock units vested.