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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2017 | Jan. 31, 2019 | Jan. 31, 2018 | Apr. 30, 2018
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |  |
Total |  | $ 671,441 |  |  | $ 615,244
Intangible Assets with Indefinite Lives [Abstract] |  |  |  |  |
Total |  | 221,162 |  |  | 232,827
Intangible assets (excluding goodwill) [Abstract] |  |  |  |  |
Total Intangible Assets, Net |  | 892,603 |  |  | 848,071
Impairment charges |  | 0 |  | $ 3,600 |
Brands and Trademarks [Member] |  |  |  |  |
Intangible Assets with Indefinite Lives [Abstract] |  |  |  |  |
Total |  | 132,912 |  |  | 138,589
Content and Publishing Rights [Member] |  |  |  |  |
Intangible Assets with Indefinite Lives [Abstract] |  |  |  |  |
Total |  | 88,250 |  |  | 94,238
Brands [Member] |  |  |  |  |
Intangible assets (excluding goodwill) [Abstract] |  |  |  |  |
Impairment charges | $ 3,600 |  |  |  |
Fair value of intangible assets | $ 1,200 |  |  |  |
Content and Publishing Rights [Member] |  |  |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |  |
Total |  | 405,426 | [1] |  | 436,760
Customer Relationships [Member] |  |  |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |  |
Total |  | 251,855 | [1] |  | 161,729
Brands and Trademarks [Member] |  |  |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |  |
Total |  | 13,663 |  |  | 16,100
Covenants Not to Compete [Member] |  |  |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |  |
Total |  | $ 497 |  |  | $ 655
[1] | As of January 31, 2019, amounts include intangible assets acquired as part of the acquisition of Learning House on November 1, 2018. Refer to Note 3, "Acquisition," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information related to the acquisition of Learning House.

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