Common Stock Rollforward of Outstanding Shares (Details) - shares shares in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Class of Stock [Line Items]
Beginning balance	479,316	479,020	478,729
Acquisition of treasury stock	(6,912)
Stock issued under compensation plans	196	296	291
Ending balance	472,600	479,316	479,020
Common stock, Class A, voting [Member]
Class of Stock [Line Items]
Beginning balance	169,240	169,175	169,110
Acquisition of treasury stock	(176)
Stock issued under compensation plans	44	65	65
Ending balance	169,108	169,240	169,175
Common Stock, Class B, nonvoting [Member]
Class of Stock [Line Items]
Beginning balance	310,076	309,845	309,619
Acquisition of treasury stock	(6,736)
Stock issued under compensation plans	152	231	226
Ending balance	303,492	310,076	309,845