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Earnings Per Share (Tables)
 12 Months Ended
Apr. 30, 2020
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: 
 
2018
 
2019
 
2020
Net income available to common stockholders
$
717

 
$
835

 
$
827

Share data (in thousands):
 
 
 
 
 
Basic average common shares outstanding
480,319

 
478,956

 
477,765

Dilutive effect of stock-based awards
3,929

 
3,111

 
2,644

Diluted average common shares outstanding
484,248

 
482,067

 
480,409

 
 
 
 
 
 
Basic earnings per share
$
1.49

 
$
1.74

 
$
1.73

Diluted earnings per share
$
1.48

 
$
1.73

 
$
1.72