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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Apr. 30, 2018
Goodwill and Intangible Assets [Abstract]  
Activity in Goodwill by Segment
The following table summarizes the activity in goodwill by segment as of April 30:

  
2017
  
Foreign
Translation
Adjustment
  
2018
 
Research
 
$
437,928
  
$
25,491
  
$
463,419
 
Publishing
  
283,192
   
12,209
   
295,401
 
Solutions
  
260,981
   
—
   
260,981
 
Total
 
$
982,101
  
$
37,700
  
$
1,019,801
 
Intangible Assets
Intangibles

Intangible assets as of April 30 were as follows:

  
2018
  
2017
 
  
Cost
  
Accumulated
Amortization
  
Accumulated
Impairment
  
Net
  
Cost
  
Accumulated
Amortization
  
Net
 
Intangible Assets with Determinable Lives
                     
Content and Publishing Rights
 
$
824,146
  
$
(387,386
)
 
$
—
  
$
436,760
  
$
775,520
  
$
(353,923
)
 
$
421,597
 
Customer Relationships
  
212,020
   
(50,291
)
  
—
   
161,729
   
233,872
   
(64,756
)
  
169,116
 
Brands and Trademarks
  
32,111
   
(16,011
)
  
—
   
16,100
   
35,554
   
(18,359
)
  
17,195
 
Covenants not to Compete
  
1,499
   
(844
)
  
—
   
655
   
2,377
   
(1,420
)
  
957
 
 
  
1,069,776
   
(454,532
)
  
—
   
615,244
   
1,047,323
   
(438,458
)
  
608,865
 
Intangible Assets with Indefinite Lives
                            
Brands and Trademarks
  
142,189
   
—
   
(3,600
)
  
138,589
   
135,061
   
—
   
135,061
 
Content and Publishing Rights
  
94,238
   
—
   
—
   
94,238
   
84,173
   
—
   
84,173
 
  
$
1,306,203
  
$
(454,532
)
 
$
(3,600
)
 
$
848,071
  
$
1,266,557
  
$
(438,458
)
 
$
828,099