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Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance 4,247,728    
Options granted in period gross 152,971    
Vesting period for share-based payments 3 years    
Closing market price (in dollars per share) $ 136.93    
Share-based compensation expense $ 22.3 $ 28.7 $ 26.8
Related income tax benefit 5.3 6.6 6.4
Cash received from option exercises 16.3 4.5 7.1
Equity instruments other than options vested in period weighted average grant date fair value total value 21.7 23.1 14.7
Fair value of equity awards other than stock options vesting $ 24.0 $ 19.7 $ 14.5
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted in period gross 152,971 296,619 193,831
Forfeiture period for share-based payments 10 years    
Aggregate intrinsic value - outstanding $ 13.5    
Aggregate intrinsic value - exercisable $ 7.5    
Average remaining contractual term - outstanding 7 years    
Average remaining contractual term - exercisable 5 years 4 months 24 days    
Intrinsic value of options exercised $ 3.6 $ 0.6 $ 0.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 22.46    
Share-based compensation expense $ 3.0 2.3 1.3
Related income tax benefit 0.7 0.5 0.3
Unrecognized compensation expense 3.8    
Cash received from option exercises $ 16.3 $ 4.5 $ 7.1
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period for share-based payments 3 years    
Restricted Shares And Deferred Stock Units 2022, 2021, and 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period for share-based payments 3 years    
Restricted Shares And Deferred Stock Units Before 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period for share-based payments 4 years