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Stock-Based Compensation - President and CEO New Hire Equity Awards (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 30, 2023
USD ($)
Installment
$ / shares
shares
ELTIP  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Targeted long-term incentive as percentage of base salary 300.00%
Targeted long-term incentive value | $ $ 2.7
ELTIP | PSU Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of targeted long-term incentive value 60.00%
Grant date fair value (in dollars per share) | $ / shares $ 59.15
Awards granted (in shares) | shares 30,916
ELTIP | Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of targeted long-term incentive value 40.00%
Grant date fair value (in dollars per share) | $ / shares $ 59.15
Awards granted (in shares) | shares 20,611
ELTIP | Restricted Stock Units (RSUs) | Vesting on April 30, 2018  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting percentage 25.00%
ELTIP | Restricted Stock Units (RSUs) | Vesting on April 30, 2019  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting percentage 25.00%
ELTIP | Restricted Stock Units (RSUs) | Vesting on April 30, 2020  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting percentage 25.00%
ELTIP | Restricted Stock Units (RSUs) | Vesting on April 30, 2021  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting percentage 25.00%
Sign-On Grant | Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant date fair value (in dollars per share) | $ / shares $ 59.15
Awards granted (in shares) | shares 67,625
Grant value | $ $ 4.0
Number of equal installments | Installment 2