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Segment Information (Tables)
9 Months Ended
Jan. 31, 2019
Segment Information [Abstract]  
Segment Information
Segment information is as follows:

  
Three Months Ended
January 31,
  
Nine Months Ended
January 31,
 
  
2019
  
2018 (1)
  
2019
  
2018 (1)
 
Revenue:
            
Research
 
$
226,353
  
$
223,489
  
$
679,990
  
$
675,986
 
Publishing
  
145,635
   
170,244
   
428,055
   
466,507
 
Solutions
  
77,379
   
61,942
   
200,845
   
176,357
 
Total Revenue
 
$
449,367
  
$
455,675
  
$
1,308,890
  
$
1,318,850
 
                 
Contribution to Profit:
                
Research
 
$
60,532
  
$
58,253
  
$
176,565
  
$
188,861
 
Publishing
  
33,706
   
47,895
   
86,881
   
94,278
 
Solutions
  
(3,427
)
  
6,403
   
6,846
   
11,744
 
Total Contribution to Profit (1)
 
$
90,811
  
$
112,551
  
$
270,292
  
$
294,883
 
Corporate Expenses
  
(40,465
)
  
(47,157
)
  
(126,331
)
  
(136,131
)
Operating Income (1)
 
$
50,346
  
$
65,394
  
$
143,961
  
$
158,752
 

(1)
Due to the retrospective adoption of ASU 2017-07, total net benefits of $2.0 million and $6.0 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 nine months ended January 31, 2018, respectively. Refer to Note 2, "Recent Accounting Standards," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information. The impact of the reclassification on Contribution to Profit by segment for the three months ended January 31, 2018 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 nine months ended January 31, 2018 was $3.1 million in Research, $1.7 million in Publishing, and $1.2 million in Corporate expenses.