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Supplementary Quarterly Financial Information (Tables)
 12 Months Ended
Apr. 30, 2018
Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) [Abstract]  
Quarterly Financial Information
Amounts in millions, except per share data
 
2018
  
2017
 
Revenue
      
First Quarter
 
$
411.4
  
$
404.3
 
Second Quarter
  
451.7
   
425.6
 
Third Quarter
  
455.7
   
436.4
 
Fourth Quarter
  
477.3
   
452.2
 
Fiscal Year
 
$
1,796.1
  
$
1,718.5
 
         
Gross Profit
        
First Quarter
 
$
296.7
  
$
290.8
 
Second Quarter
  
331.9
   
314.0
 
Third Quarter
  
330.5
   
320.1
 
Fourth Quarter
  
351.8
   
332.9
 
Fiscal Year
 
$
1,310.9
  
$
1,257.8
 
         
Operating Income
        
First Quarter
 
$
14.5
  
$
43.8
 
Second Quarter
  
82.8
   
47.7
 
Third Quarter
  
67.4
   
51.2
 
Fourth Quarter
  
74.8
   
63.5
 
Fiscal Year
 
$
239.5
  
$
206.2
 
         
Net Income
        
First Quarter
 
$
9.2
  
$
31.0
 
Second Quarter
  
60.0
   
(11.5
)
Third Quarter
  
68.8
   
47.4
 
Fourth Quarter
  
54.2
   
46.7
 
Fiscal Year
 
$
192.2
  
$
113.6
 

  
2018
  
2017
 
  
Basic
  
Diluted
  
Basic
  
Diluted
 
Earnings Per Share (1)
            
First Quarter
 
$
0.16
  
$
0.16
  
$
0.54
  
$
0.53
 
Second Quarter
  
1.06
   
1.04
   
(0.20
)
  
(0.20
)
Third Quarter
  
1.21
   
1.19
   
0.83
   
0.82
 
Fourth Quarter
  
0.95
   
0.93
   
0.82
   
0.81
 
Fiscal Year
 
$
3.37
  
$
3.32
  
$
1.98
  
$
1.95
 

(1)
The sum of the quarterly earnings per share amounts may not agree to the respective annual amounts due to rounding.