Income Taxes (Details 4) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Reconciliation of unrecognized tax benefits
Balance at May 1,	$ 4.6	$ 5.3	$ 6.5
Increases:
Acquired business	0.0	1.3	0.0
Decreases:
Expiration of statute of limitations periods	1.3	2.0	1.2
Disposed business	0.8	0.0	0.0
Balance at April 30,	$ 2.5	$ 4.6	$ 5.3