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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Finite-lived intangible assets [Abstract] |  |  |  |
Cost |  | $ 1,152,088 | $ 1,069,776 |
Accumulated amortization |  | (503,648) | (454,532) |
Total |  | 648,440 | 615,244 |
Intangible assets with indefinite lives [Abstract] |  |  |  |
Cost |  | 220,732 | 236,427 |
Accumulated impairment |  | (3,600) | (3,600) |
Total |  | 217,132 | 232,827 |
Intangible assets (excluding goodwill) [Abstract] |  |  |  |
Cost |  | 1,372,820 | 1,306,203 |
Total Intangible Assets, Net |  | 865,572 | 848,071 |
Impairment charges |  | 0 | 3,600 | $ 0
Estimated future amortization expense related to intangible assets [Abstract] |  |  |  |
2020 |  | 50,419 |  |
2021 |  | 48,517 |  |
2022 |  | 44,115 |  |
2023 |  | 40,305 |  |
2024 |  | 37,929 |  |
Thereafter |  | 427,155 |  |
Total |  | 648,440 | 615,244 |
Brands and Trademarks [Member] |  |  |  |
Intangible assets with indefinite lives [Abstract] |  |  |  |
Cost |  | 134,509 | 142,189 |
Accumulated impairment |  | (3,600) | (3,600) |
Total |  | $ 130,909 | 138,589 |
Trademarks [Member] |  |  |  |
Intangible assets (excluding goodwill) [Abstract] |  |  |  |
% by which estimated fair value exceeds carrying value |  | 7.00% |  |
Content and Publishing Rights [Member] |  |  |  |
Intangible assets with indefinite lives [Abstract] |  |  |  |
Cost |  | $ 86,223 | 94,238 |
Accumulated impairment |  | 0 | 0 |
Total |  | 86,223 | 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] |  |  |  |
Finite-lived intangible assets [Abstract] |  |  |  |
Cost |  | 806,628 | 824,146 |
Accumulated amortization |  | (417,456) | (387,386) |
Total |  | 389,172 | 436,760 |
Estimated future amortization expense related to intangible assets [Abstract] |  |  |  |
Total |  | 389,172 | 436,760 |
Customer Relationships [Member] |  |  |  |
Finite-lived intangible assets [Abstract] |  |  |  |
Cost |  | 310,977 | 212,020 |
Accumulated amortization |  | (65,147) | (50,291) |
Total |  | 245,830 | 161,729 |
Estimated future amortization expense related to intangible assets [Abstract] |  |  |  |
Total |  | 245,830 | 161,729 |
Brands and Trademarks [Member] |  |  |  |
Finite-lived intangible assets [Abstract] |  |  |  |
Cost |  | 32,802 | 32,111 |
Accumulated amortization |  | (19,809) | (16,011) |
Total |  | 12,993 | 16,100 |
Estimated future amortization expense related to intangible assets [Abstract] |  |  |  |
Total |  | 12,993 | 16,100 |
Covenants Not to Compete [Member] |  |  |  |
Finite-lived intangible assets [Abstract] |  |  |  |
Cost |  | 1,681 | 1,499 |
Accumulated amortization |  | (1,236) | (844) |
Total |  | 445 | 655 |
Estimated future amortization expense related to intangible assets [Abstract] |  |  |  |
Total |  | $ 445 | $ 655 |
Brands [Member] |  |  |  |
Finite-lived intangible assets [Abstract] |  |  |  |
Estimated useful life |  | 5 years |  |

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