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Earnings Per Share (Tables)
 12 Months Ended
Apr. 30, 2019
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: 
 
2017
 
2018
 
2019
Net income available to common stockholders
$
669

 
$
717

 
$
835

Share data (in thousands):
 
 
 
 
 
Basic average common shares outstanding
484,635

 
480,319

 
478,956

Dilutive effect of stock-based awards
3,442

 
3,929

 
3,111

Diluted average common shares outstanding
488,077

 
484,248

 
482,067

 
 
 
 
 
 
Basic earnings per share
$
1.38

 
$
1.49

 
$
1.74

Diluted earnings per share
$
1.37

 
$
1.48

 
$
1.73