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Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance 4,781,736    
Options granted in period gross 193,831    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 62,750    
Closing market price (in dollars per share) $ 114.91    
Share-based compensation expense $ 26.8 $ 20.7 $ 15.4
Related income tax benefit $ (6.4) (4.9) (4.6)
Weighted-average period of recognition 2 years 7 months 6 days    
Cash received from option exercises $ 7.1 0.0 3.9
Equity instruments other than options vested in period weighted average grant date fair value total value 14.7 17.0 17.1
Fair value of equity awards other than stock options vesting $ 14.5 $ 17.0 $ 20.7
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted in period gross 193,831 0 0
Vesting period for share-based payments 3 years    
Forfeiture period for share-based payments 10 years    
Aggregate intrinsic value - outstanding $ 1.0    
Average remaining contractual term - outstanding 6 years 6 months    
Aggregate intrinsic value - exercisable $ 0.8    
Average remaining contractual term - exercisable 5 years    
Intrinsic value of options exercised $ 0.2 $ 0.0 $ 0.6
Share-based compensation expense 1.3 0.0 0.4
Related income tax benefit (0.3) 0.0 (0.1)
Unrecognized compensation expense 1.8    
Cash received from option exercises $ 7.1 $ 0.0 $ 3.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 17.82    
Employee Stock Option [Member] | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period for share-based payments 1 year    
Employee Stock Option [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period for share-based payments 4 years    
Restricted Shares And Deferred Stock Units 2020 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock, vesting period (in Years) 3 years    
Restricted Shares And Deferred Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock, vesting period (in Years) 4 years    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock, vesting period (in Years) 3 years