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Stock-Based Compensation - Summary of Vested Performance Based Restricted Stock Units (Detail) - Performance Based Restricted Stock Units [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 30, 2023
USD ($)
$ / shares
shares
Senior Executives [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-Based Restricted Stock Units Vested | shares 545 [1]
Weighted Average Fair Value | $ $ 3 [1],[2]
Price Per Share | $ / shares $ 5.1 [1],[3]
Key Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance-Based Restricted Stock Units Vested | shares 437 [4]
Weighted Average Fair Value | $ $ 2 [2],[4]
Price Per Share | $ / shares $ 5.1 [3],[4]
[1] Performance-based restricted stock units vested for senior executives.
[2] Dollar amounts are in thousands.
[3] Price per share is derived from the closing prices of our common stock on the dates the respective performance-based restricted stock units vested.
[4] Performance-based restricted stock units vested for key employees.