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Common Stock (Tables)
 12 Months Ended
Apr. 30, 2017
Class of Stock [Line Items]  
Schedule of Stock by Class [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, 2014
168,924

 
257,986

 
426,910

Acquisition of treasury stock
(171
)
 
(10,069
)
 
(10,240
)
Stock issued under compensation plans
173

 
557

 
730

Balance at April 30, 2015
168,926

 
248,474

 
417,400

Acquisition of treasury stock
(114
)
 
(22,714
)
 
(22,828
)
Stock issued under compensation plans
248

 
664

 
912

Balance at April 30, 2016
169,060

 
226,424

 
395,484

Acquisition of treasury stock
(77
)
 
(11,799
)
 
(11,876
)
Stock issued under compensation plans
68

 
410

 
478

Balance at April 30, 2017
169,051

 
215,035

 
384,086