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Earnings Per Share (Tables)
 12 Months Ended
Apr. 30, 2017
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: 
 
2015
 
2016
 
2017
Net income available to common stockholders
$
684

 
$
1,067

 
$
669

Share data (in thousands):
 
 
 
 
 
Basic average common shares outstanding
423,185

 
405,953

 
387,708

Dilutive effect of stock-based awards
2,980

 
2,607

 
2,753

Diluted average common shares outstanding
426,165

 
408,560

 
390,461

 
 
 
 
 
 
Basic earnings per share
$
1.62

 
$
2.63

 
$
1.72

Diluted earnings per share
$
1.60

 
$
2.61

 
$
1.71