Leases (Details 2) $ in Millions	12 Months Ended
	Apr. 30, 2020 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 50.8
Operating cash flows from finance leases	0.2
Financing cash flows from finance leases	2.8
Right-of-use assets obtained in exchange for operating lease liabilities	57.0
Right-of-use assets obtained in exchange for finance lease liabilities	$ 2.6