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Segment Information (Tables)
6 Months Ended
Oct. 31, 2018
Segment Information [Abstract]  
Segment Information
Segment information is as follows:

  
Three Months Ended
October 31,
  
Six Months Ended
October 31,
 
  
2018
  
2017 (1)
  
2018
  
2017 (1)
 
Revenue:
            
Research
 
$
228,645
  
$
228,870
  
$
453,637
  
$
452,497
 
Publishing
  
157,499
   
164,985
   
282,420
   
296,263
 
Solutions
  
62,478
   
57,876
   
123,466
   
114,415
 
Total Revenue
 
$
448,622
  
$
451,731
  
$
859,523
  
$
863,175
 
                 
Contribution to Profit:
                
Research
 
$
58,907
  
$
70,146
  
$
116,033
  
$
130,608
 
Publishing
  
39,455
   
41,913
   
53,175
   
46,383
 
Solutions
  
7,049
   
7,309
   
10,273
   
5,341
 
Total Contribution to Profit (1)
 
$
105,411
  
$
119,368
  
$
179,481
  
$
182,332
 
Corporate Expenses
  
(47,936
)
  
(38,580
)
  
(85,866
)
  
(88,974
)
Operating Income (1)
 
$
57,475
  
$
80,788
  
$
93,615
  
$
93,358
 

(1)
Due to the retrospective adoption of ASU 2017-07, total net benefits of $2.0 million and $3.9 million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest Income and Other for the three and six months ended October 31, 2017, respectively. Refer to Note 2, "Recent Accounting Standards," in the Notes to Condensed Consolidated Financial Statements for more information. The impact of the reclassification on Contribution to Profit by segment for the three months ended October 31, 2017 was $1.0 million in Research, $0.6 million in Publishing, and $0.4 million in Corporate expenses. The impact of the reclassification on Contribution to Profit by segment for the six months ended October 31, 2017 was $2.0 million in Research, $1.1 million in Publishing, and $0.8 million in Corporate expenses.