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Earnings Per Share (Tables)
 12 Months Ended
Apr. 30, 2018
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: 
 
2016
 
2017
 
2018
Net income available to common stockholders
$
1,067

 
$
669

 
$
717

Share data (in thousands):
 
 
 
 
 
Basic average common shares outstanding
507,441

 
484,635

 
480,319

Dilutive effect of stock-based awards
3,259

 
3,442

 
3,929

Diluted average common shares outstanding
510,700

 
488,077

 
484,248

 
 
 
 
 
 
Basic earnings per share
$
2.10

 
$
1.38

 
$
1.49

Diluted earnings per share
$
2.09

 
$
1.37

 
$
1.48