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Segment Information (Tables)
 6 Months Ended
Oct. 31, 2017
Segment Information [Abstract]  
Segment Information
Segment information is as follows (in thousands):
 
  
Three Months
  
Six Months
 
  
Ended October 31,
  
Ended October 31,
 
  
2017
  
2016
  
2017
  
2016
 
Revenue:
            
Research
 
$
228,870
  
$
205,994
  
$
452,497
  
$
413,218
 
Publishing
  
164,985
   
163,300
   
296,263
   
308,261
 
Solutions
  
57,876
   
56,294
   
114,415
   
108,394
 
Total Revenue
 
$
451,731
  
$
425,588
  
$
863,175
  
$
829,873
 
                 
Contribution to Profit:
                
Research
 
$
71,163
  
$
60,292
  
$
132,624
  
$
120,727
 
Publishing
  
42,476
   
36,490
   
47,485
   
55,832
 
Solutions
  
7,309
   
5,359
   
5,341
   
5,506
 
Total Contribution to Profit
 
$
120,948
  
$
102,141
  
$
185,450
  
$
182,065
 
Corporate Expenses
  
(38,177
)
  
(54,497
)
  
(88,179
)
  
(90,494
)
Operating Income
 
$
82,771
  
$
47,644
  
$
97,271
  
$
91,571