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Earnings Per Share (Tables)
 12 Months Ended
Apr. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents information concerning basic and diluted earnings per share: 
 
2014
 
2015
 
2016
Net income available to common stockholders
$
659

 
$
684

 
$
1,067

Share data (in thousands):
 
 
 
 
 
Basic average common shares outstanding
213,454

 
211,593

 
202,977

Dilutive effect of stock-based awards
1,628

 
1,490

 
1,303

Diluted average common shares outstanding
215,082

 
213,083

 
204,280

 
 
 
 
 
 
Basic earnings per share
$
3.08

 
$
3.23

 
$
5.26

Diluted earnings per share
$
3.06

 
$
3.21

 
$
5.22