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Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) (Tables)
 12 Months Ended
Apr. 30, 2021
Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) [Abstract]  
Quarterly Financial Information
Amounts in millions, except per share data
  
2021
    
2020
  
Revenue, net
            
First quarter
  
$
431.3
    
$
423.5
  
Second quarter
    
491.0
      
466.2
  
Third quarter
    
482.9
      
467.1
  
Fourth quarter
    
536.3
      
474.7
  
Year ended April 30,
  
$
1,941.5
    
$
1,831.5
  
                 
Gross profit
                
First quarter
  
$
286.5
    
$
280.4
  
Second quarter
    
336.2
      
322.8
  
Third quarter
    
325.3
      
313.2
  
Fourth quarter
    
368.2
      
324.1
  
Year ended April 30,
  
$
1,316.2
    
$
1,240.5
  
                 
Operating income (loss)
                
First quarter
  
$
30.0
    
$
4.5
  
Second quarter
    
69.9
      
63.4
  
Third quarter
    
34.4
      
48.5
  
Fourth quarter
    
51.2
      
(170.7
)
Year ended April 30,
  
$
185.5
    
$
(54.3
)
                 
Net income (loss)
                
First quarter
  
$
16.3
    
$
3.6
  
Second quarter
    
68.4
      
44.7
  
Third quarter
    
22.2
      
35.4
  
Fourth quarter
    
41.4
      
(158.0
)
Year ended April 30,
  
$
148.3
    
$
(74.3
)

 
2021
    
2020
  
   
Basic
    
Diluted
    
Basic
    
Diluted
  
Earnings (loss) per share (1)
                        
First quarter
  
$
0.29
    
$
0.29
    
$
0.06
    
$
0.06
  
Second quarter
    
1.22
      
1.22
      
0.79
      
0.79
  
Third quarter
    
0.40
      
0.39
      
0.63
      
0.63
  
Fourth quarter (2)
    
0.74
      
0.73
      
(2.83
)
    
(2.83
)
Year ended April 30, (2)
  
$
2.65
    
$
2.63
    
$
(1.32
)
  
$
(1.32
)

 
(1)
The sum of the quarterly earnings (loss) per share amounts may not agree to the respective annual amounts due to rounding.
(2)
In calculating diluted earnings (loss) per common share for the fourth quarter and year ended April 30, 2020, our diluted weighted average number of common shares outstanding excludes the effect of unvested restricted stock units and other stock awards as the effect was anti-dilutive. This occurs when a US GAAP net loss is reported and the effect of using dilutive shares is antidilutive.