Common Stock (Tables)

12 Months Ended

Apr. 30, 2021

Class of Stock [Line Items]

Schedule of Common Stock Outstanding Roll Forward [Table Text Block]

The following table shows the change in outstanding common shares during each of the last three years:

(Shares in thousands)	Class A	Class B	Total
Balance at April 30, 2018	169,062	311,939	481,001
Acquisition of treasury stock	(145)	(4,212)	(4,357)
Stock issued under compensation plans	82	446	528
Balance at April 30, 2019	168,999	308,173	477,172
Acquisition of treasury stock	(13)	(3)	(16)
Stock issued under compensation plans	54	999	1,053
Balance at April 30, 2020	169,040	309,169	478,209
Acquisition of treasury stock	—	—	—
Stock issued under compensation plans	70	450	520
Balance at April 30, 2021	169,110	309,619	478,729