Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Income (loss) before income taxes
Domestic	$ 806.0	$ 1,176.6	$ 986.7
Foreign	37.8	(4.7)	40.0
Income Before Income Taxes	$ 843.8	$ 1,171.9	$ 1,026.7