Leases (Details 2) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Leases [Abstract]
Operating cash flows from operating leases	$ 44.3	$ 45.6	$ 45.7
Operating cash flows from finance leases	0.1	0.1	0.2
Financing cash flows from finance leases	1.7	2.1	2.6
Right-of-use assets obtained in exchange for operating lease liabilities	37.9	7.2	34.8
Right-of-use assets obtained in exchange for finance lease liabilities	$ 1.5	$ 1.8	$ 1.1