Supplemental Information (Net Sales by Geography) (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	$ 4,228	$ 3,933	$ 3,461
United States
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	1,968	1,917	1,748
Mexico
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	244	178	150
Germany
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	239	228	206
Australia
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	221	219	209
United Kingdom
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	207	218	205
Other Countries
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	$ 1,349	$ 1,173	$ 943