Leases (Details 1) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Leases [Abstract]
Operating lease cost		$ 11.6	$ 12.0	$ 24.0	$ 24.5
Finance lease cost:
Amortization of right-of-use assets		0.8	0.8	1.7	1.6
Interest on lease liabilities		0.1	0.1	0.3	0.3
Variable lease cost		5.5	5.8	11.4	12.3
Short-term lease cost		10.5	12.7	20.8	23.9
Total lease cost	[1]	$ 28.5	$ 31.4	$ 58.2	$ 62.6

[1] Total lease cost does not include sublease income which is immaterial for all years presented.