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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Apr. 30, 2017
Goodwill and Intangible Assets [Abstract]  
Activity in Goodwill by Segment
The following table summarizes the activity in goodwill by segment as of April 30 (in thousands):
 
 
2016
Acquisitions
Foreign
Translation
Adjustment
2017
Research
$406,395
69,867
$(38,334)
$437,928
Publishing
284,217
         -
(1,025)
283,192
Solutions
261,051
3,405
(3,475)
260,981
Total
$951,663
$73,272
$(42,834)
$982,101
Schedule of Intangible Assets
Intangible assets as of April 30 were as follows (in thousands):
 
   
2017
 
2016
   
 
Cost
Accumulated
Amortization
 
 
Cost
Accumulated
Amortization
Intangible Assets with Determinable Lives
           
Content and Publishing Rights
 
   $775,520
   $(353,923)
 
   $790,055
   $(333,174)
Customer Relationships
 
233,872
(64,756)
 
224,839
(54,677)
Brands & Trademarks
 
35,554
(18,359)
 
30,116
(15,713)
Covenants not to Compete
 
2,377
(1,420)
 
1,687
(1,011)
   
1,047,323
(438,458)
 
1,046,697
(404,575)
Intangible Assets with Indefinite Lives
           
Brands & Trademarks
 
135,061
-
 
147,683
-
Content and Publishing Rights
 
84,173
-
 
87,202
-
   
$1,266,557
$(438,458)
 
$1,281,582
$(404,575)