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Goodwill and Intangible Assets (Tables)
6 Months Ended
Oct. 31, 2017
Goodwill and Intangible Assets [Abstract]  
Activity in Goodwill by Segment
The following table summarizes the activity in goodwill by segment as of October 31 (in thousands):
     
Foreign
    
     
Translation
    
  
April 30,2017
  
Adjustment
  
October 31,2017
 
Research
 
$
437,928
  
$
9,569
  
$
447,497
 
Publishing
  
283,192
   
7,876
   
291,068
 
Solutions
  
260,981
   
-
   
260,981
 
Total
 
$
982,101
  
$
17,445
  
$
999,546
 

     
Foreign
   
     
Translation
   
 
April 30,2016
 
Acquisitions
 
Adjustment
 
October 31,2016
 
Research
 
$
406,395
  
$
74,119
  
$
(51,110
)
 
$
429,404
 
Publishing
  
284,217
   
-
   
(4,709
)
  
279,508
 
Solutions
  
261,051
   
4,105
   
-
   
265,156
 
Total
 
$
951,663
  
$
78,224
  
$
(55,819
)
 
$
974,068
 
Schedule of Intangible Assets
 
Intangible assets consisted of the following (in thousands):
  
October 31,
  
April 30,
 
  
2017
  
2016
  
2017
 
Intangible assets with indefinite lives:
         
Brands and trademarks
 
$
133,180
  
$
130,632
  
$
135,061
 
Content and publishing rights
  
90,815
   
84,274
   
84,173
 
  
$
223,995
  
$
214,906
  
$
219,234
 
             
Net intangible assets with determinable lives:
            
Content and publishing rights
 
$
420,508
  
$
406,467
  
$
421,597
 
Customer relationships
  
166,006
   
182,584
   
169,116
 
Brands and trademarks
  
17,246
   
17,522
   
17,195
 
Covenants not to compete
  
769
   
1,483
   
957
 
  
$
604,529
  
$
608,056
  
$
608,865
 
Total
 
$
828,524
  
$
822,962
  
$
828,099