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Earnings per Share (Tables)
12 Months Ended
Apr. 30, 2019
Earnings Per Share [Abstract]  
Computation of earnings per common share, basic and diluted
The following table sets forth the computation of net income per common share and net income per common share – assuming dilution under the two-class method.
  
Year Ended April 30,
  
2019
 
2018
 
2017
Net income
$
514.4

 
$
1,338.6

 
$
592.3

Less: Net income allocated to participating securities
2.6

 
6.8

 
2.8

Net income allocated to common stockholders
$
511.8

 
$
1,331.8

 
$
589.5

Weighted-average common shares outstanding
113.1


113.0


115.5

Add: Dilutive effect of stock options

 
0.1
 
Weighted-average common shares outstanding – assuming dilution
113.1


113.0


115.6

Net income per common share
$
4.52

 
$
11.79

 
$
5.11

Net income per common share – assuming dilution
$
4.52

 
$
11.78

 
$
5.10