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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Tax Credit Carryforward [Line Items]        
Income tax expense (benefit) $ 212.1 $ 295.6 $ 247.2  
Foreign Earnings Repatriated 0.0 100.0    
Undistributed earnings of foreign subsidiaries on which deferred income taxes not provided 30.0      
Company's unrecognized tax benefits 6.5 10.2 13.1 $ 15.0
Unrecognized tax benefits that would affect the effective tax rate $ 5.1 8.1 $ 10.5  
Time period over which it is reasonably possible that the Company could decrease its unrecognized tax benefits 12 months      
Amount unrecognized tax benefit could decrease in next 12 months $ 1.2      
Foreign Tax Authority        
Tax Credit Carryforward [Line Items]        
Foreign Earning Repatriated, Withholding Taxes   $ 5.0