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Equity-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 1,958 $ 1,605
Selling, general and administrative expenses    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 1,700 1,400
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Intrinsic value of options exercised 1,200 300
Unrecognized compensation cost, options $ 3,200  
Weighted-average period for recognition of unrecognized compensation expense (in years) 1 year 7 months 6 days  
Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average period for recognition of unrecognized compensation expense (in years) 1 year 7 months 6 days  
Unrecognized compensation cost, RSUs $ 3,200  
ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 200 $ 200
Percentage of common stock price based on closing price at the beginning or end of the last day of the purchase period 90.00%  
Purchase period (in months) 6 months  
Number of shares purchased under ESPP (in shares) 43 58
Average price per share (in dollars per share) $ 26.36 $ 22.13