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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, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Intangible assets with determinable lives [Abstract] |  |  |  |
Cost |  | $ 1,069,776 | $ 1,047,323 |
Accumulated amortization |  | (454,532) | (438,458) |
Net |  | 615,244 | 608,865 |
Intangible assets with indefinite lives [Abstract] |  |  |  |
Accumulated impairment |  | (3,600) |  |
Intangible assets (excluding goodwill) [Abstract] |  |  |  |
Cost |  | 1,306,203 | 1,266,557 |
Net |  | 848,071 | 828,099 |
Impairment charges |  | 3,600 | 0 | $ 0
Estimated future amortization expense related to intangible assets [Abstract] |  |  |  |
2019 |  | 48,200 |  |
2020 |  | 43,600 |  |
2021 |  | 41,400 |  |
2022 |  | 36,400 |  |
2023 |  | 32,700 |  |
Brands and Trademarks [Member] |  |  |  |
Intangible assets with indefinite lives [Abstract] |  |  |  |
Cost |  | 142,189 | 135,061 |
Accumulated impairment |  | (3,600) |  |
Net |  | 138,589 | 135,061 |
Content and Publishing Rights [Member] |  |  |  |
Intangible assets with indefinite lives [Abstract] |  |  |  |
Cost |  | 94,238 | 84,173 |
Accumulated impairment |  | 0 |  |
Net |  | 94,238 | 84,173 |
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 [Abstract] |  |  |  |
Cost |  | 824,146 | 775,520 |
Accumulated amortization |  | (387,386) | (353,923) |
Net |  | 436,760 | 421,597 |
Customer Relationships [Member] |  |  |  |
Intangible assets with determinable lives [Abstract] |  |  |  |
Cost |  | 212,020 | 233,872 |
Accumulated amortization |  | (50,291) | (64,756) |
Net |  | 161,729 | 169,116 |
Brands and Trademarks [Member] |  |  |  |
Intangible assets with determinable lives [Abstract] |  |  |  |
Cost |  | 32,111 | 35,554 |
Accumulated amortization |  | (16,011) | (18,359) |
Net |  | 16,100 | 17,195 |
Covenants Not to Compete [Member] |  |  |  |
Intangible assets with determinable lives [Abstract] |  |  |  |
Cost |  | 1,499 | 2,377 |
Accumulated amortization |  | (844) | (1,420) |
Net |  | $ 655 | $ 957 |
Brands [Member] |  |  |  |
Intangible assets with determinable lives [Abstract] |  |  |  |
Estimated useful life |  | 5 years |  |

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