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Common Stock (Tables)
 12 Months Ended
Apr. 30, 2020
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 (split-adjusted) during each of the last three years:
(Shares in thousands)
Class A
 
Class B
 
Total
Balance at April 30, 2017
169,051

 
311,055

 
480,106

Acquisition of treasury stock
(25
)
 
(6
)
 
(31
)
Stock issued under compensation plans
36

 
890

 
926

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