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Segment Information (Tables)
 9 Months Ended
Jan. 31, 2018
Segment Information [Abstract]  
Segment Information
Segment information is as follows:
 
  
Three Months
Ended January 31,
  
Nine Months
Ended January 31,
 
  
2018
  
2017
  
2018
  
2017
 
Revenue:
            
Research
 
$
223,489
  
$
205,769
  
$
675,986
  
$
618,987
 
Publishing
  
170,244
   
171,440
   
466,507
   
479,701
 
Solutions
  
61,942
   
59,247
   
176,357
   
167,641
 
Total Revenue
 
$
455,675
  
$
436,456
  
$
1,318,850
  
$
1,266,329
 
                 
Contribution to Profit:
                
Research
 
$
59,299
  
$
52,508
  
$
191,923
  
$
173,235
 
Publishing
  
48,472
   
38,807
   
95,957
   
94,639
 
Solutions
  
6,403
   
3,591
   
11,744
   
9,097
 
Total Contribution to Profit
 
$
114,174
  
$
94,906
  
$
299,624
  
$
276,971
 
Corporate Expenses
  
(46,743
)
  
(43,746
)
  
(134,922
)
  
(134,240
)
Operating Income
 
$
67,431
  
$
51,160
  
$
164,702
  
$
142,731