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Earnings per Share (Tables)
 3 Months Ended
Jul. 31, 2022
Earnings Per Share [Abstract]  
Computation of basis earnings per common share under two-class method The following table sets forth the computation of basic earnings per share and diluted earnings per share under the two-class method.
 Three Months Ended July 31,
 20222021
Net income$109.8 $153.9 
Less: Net income allocated to participating securities0.2 0.5 
Net income allocated to common stockholders$109.6 $153.4 
Weighted-average common shares outstanding106.3 108.0 
Add: Dilutive effect of stock options0.1 0.1 
Weighted-average common shares outstanding – assuming dilution106.4 108.1 
Net income per common share$1.03 $1.42 
Net income per common share – assuming dilution$1.03 $1.42 
Computation of diluted earnings per common share under two-class method The following table sets forth the computation of basic earnings per share and diluted earnings per share under the two-class method.
 Three Months Ended July 31,
 20222021
Net income$109.8 $153.9 
Less: Net income allocated to participating securities0.2 0.5 
Net income allocated to common stockholders$109.6 $153.4 
Weighted-average common shares outstanding106.3 108.0 
Add: Dilutive effect of stock options0.1 0.1 
Weighted-average common shares outstanding – assuming dilution106.4 108.1 
Net income per common share$1.03 $1.42 
Net income per common share – assuming dilution$1.03 $1.42 
Computation of earnings per common share, basic and diluted
The following table sets forth the computation of diluted earnings per share under the treasury stock method for the three months ended July 31, 2022.
Net income$109.8 
Weighted-average common shares outstanding – assuming dilution:
Weighted-average common shares outstanding106.3 
Add: Dilutive effect of stock options0.1 
Add: Dilutive effect of restricted shares, restricted stock units, and performance units0.4 
Weighted-average common shares outstanding – assuming dilution106.8 
Net income per common share – assuming dilution$1.03