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Compensation Related Costs and Share Based Payments - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award    
Number of shares available for grant reduction per stock option issued (in shares) 1  
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award    
Number of shares available for grant reduction per equity instruments other options issued (in shares) 2  
Stock Incentive Plans | Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award    
Earnings before interest, tax, depreciation and amortization measurement period 3 years  
Total shareholder return measurement period 3 years  
Return on invested capital measurement period 3 years  
Allocated share-based compensation expense $ 17,500 $ 14,492
Unrecognized compensation costs related to plan $ 43,139  
2018 Stock Plan    
Share-based Compensation Arrangement by Share-based Payment Award    
Number of shares available for grant (in shares) 1,975,756  
2018 Stock Plan | Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award    
Granted (in shares) 0