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Restructuring and Related Charges (Tables)
 12 Months Ended
Apr. 30, 2018
Restructuring and Related Charges [Abstract]  
Pre-tax Restructuring Charges
The following tables summarize the pre-tax restructuring charges related to this program:

  
2018
  
2017
  
2016
  
Total Charges
Incurred to Date
 
Charges by Segment:
            
Research
 
$
5,257
  
$
1,949
  
$
2,982
  
$
25,413
 
Publishing
  
6,443
   
1,596
   
4,507
   
38,931
 
Solutions
  
3,695
   
1,787
   
1,042
   
6,247
 
Corporate Expenses
  
13,171
   
8,023
   
20,080
   
95,919
 
Total Restructuring and Related Charges
 
$
28,566
  
$
13,355
  
$
28,611
  
$
166,510
 
                 
Charges (Credits) by Activity:
                
Severance
 
$
27,213
  
$
8,386
  
$
16,443
  
$
114,803
 
Process Reengineering Consulting
  
1,815
   
148
   
7,191
   
20,629
 
Other Activities
  
(462
)
  
4,821
   
4,977
   
31,078
 
Total Restructuring and Related Charges
 
$
28,566
  
$
13,355
  
$
28,611
  
$
166,510
 
Activity for Restructuring and Reinvestment Program Liability
The following table summarizes the activity for the Restructuring and Reinvestment Program liability for fiscal year 2018:

  
April 30, 2017
  
Charges
  
Payments
  
Foreign Translation
and Reclassification
  
April 30, 2018
 
Severance
 
$
10,082
  
$
27,213
  
$
(21,197
)
 
$
1,181
  
$
17,279
 
Process Reengineering Consulting
  
—
   
1,815
   
(1,815
)
  
—
   
—
 
Other Activities
  
12,708
   
(462
)
  
(7,583
)
  
(1,891
)
  
2,772
 
Total
 
$
22,790
  
$
28,566
  
$
(30,595
)
 
$
(710
)
 
$
20,051