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

  
Three Months Ended
July 31,
 
  
2018
  
2017 (1)
 
Revenue:
      
Research
 
$
224,992
  
$
223,627
 
Publishing
  
124,921
   
131,278
 
Solutions
  
60,988
   
56,539
 
Total Revenue
 
$
410,901
  
$
411,444
 
         
Contribution to Profit:
        
Research
 
$
57,126
  
$
60,462
 
Publishing
  
13,720
   
4,470
 
Solutions
  
3,224
   
(1,968
)
Total Contribution to Profit (1)
 
$
74,070
  
$
62,964
 
Corporate Expenses (1)
  
(37,930
)
  
(50,394
)
Operating Income (1)
 
$
36,140
  
$
12,570
 

(1)
Due to the retrospective adoption of ASU 2017-07, total net benefits of $1.9 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. 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 July 31, 2017 was $1.0 million in Research, $0.5 million in Publishing, and $0.4 million in Corporate expenses.