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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Apr. 30, 2020
Goodwill and Intangible Assets [Abstract]  
Activity in Goodwill by Segment
The following table summarizes the activity in goodwill by segment as of April 30:
  
2019
    
Acquisitions (1)
    
Impairment
    
Foreign
Translation
Adjustment
    
2020
  
Research Publishing & Platforms
  
$
438,511
    
$
19,356
    
$
—
    
$
(9,737
)
  
$
448,130
  
Academic & Professional Learning
    
458,145
      
45,410
      
—
      
(2,464
)
    
501,091
  
Education Services
    
199,010
      
82,561
      
(110,000
)
    
(4,002
)
    
167,569
  
Total
  
$
1,095,666
    
$
147,327
    
$
(110,000
)
  
$
(16,203
)
  
$
1,116,790
  

(1)
Refer to Note 4, “Acquisitions,” in the Notes to Consolidated Financial Statements for more information related to the acquisitions that occurred in the year ended April 30, 2020.
Intangible Assets
Intangible assets, net as of April 30 were as follows:
  
2020
    
2019
  
   
Cost
    
Accumulated
Amortization
    
Accumulated
Impairment
    
Net
    
Cost
    
Accumulated
Amortization
    
Accumulated
Impairment
    
Net
  
Intangible Assets with Definite Lives, net
                                                
Content and Publishing Rights
  
$
806,862
    
$
(444,756
)
  
$
—
    
$
362,106
    
$
806,628
    
$
(417,456
)
  
$
—
    
$
389,172
  
Customer Relationships
    
377,652
      
(87,234
)
    
—
      
290,418
      
310,977
      
(65,147
)
    
—
      
245,830
  
Developed Technology
    
19,225
      
(3,273
)
    
(2,841
)
    
13,111
      
—
      
—
      
—
      
—
  
Brands and Trademarks
    
42,877
      
(22,689
)
    
—
      
20,188
      
32,802
      
(19,809
)
    
—
      
12,993
  
Covenants not to Compete
    
1,675
      
(1,429
)
    
—
      
246
      
1,681
      
(1,236
)
    
—
      
445
  
Total (1)
    
1,248,291
      
(559,381
)
    
(2,841
)
    
686,069
      
1,152,088
      
(503,648
)
    
—
      
648,440
  
Intangible Assets with Indefinite Lives
                                                                
Brands and Trademarks
    
130,107
      
—
      
(93,107
)
    
37,000
      
134,509
      
—
      
(3,600
)
    
130,909
  
Publishing Rights
    
84,336
      
—
      
—
      
84,336
      
86,223
      
—
      
—
      
86,223
  
Total
    
214,443
      
—
      
(93,107
)
    
121,336
      
220,732
      
—
      
(3,600
)
    
217,132
  
Total Intangible Assets, Net
  
$
1,462,734
    
$
(559,381
)
  
$
(95,948
)
  
$
807,405
    
$
1,372,820
    
$
(503,648
)
  
$
(3,600
)
  
$
865,572
  

(1)
Refer to Note 4, “Acquisitions,” in the Notes to Consolidated Financial Statements for more information related to the acquisitions that occurred in 2020 and 2019.
Future Amortization Expense
Based on the current amount of intangible assets subject to amortization and assuming current foreign exchange rates, the estimated amortization expense for the following years are as follows:

Fiscal Year
  
Amount
  
2021
  
$
65,570
  
2022
    
59,748
  
2023
    
53,796
  
2024
    
50,554
  
2025
    
46,364
  
Thereafter
    
410,037
  
Total
  
$
686,069