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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016
--- | --- | ---
Intangible assets with determinable lives [Abstract] |  |
Cost | $ 1,047,323 | $ 1,046,697
Accumulated amortization | (438,458) | (404,575)
Intangible assets (excluding goodwill) [Abstract] |  |
Cost | 1,266,557 | 1,281,582
Accumulated amortization | (438,458) | (404,575)
Estimated future amortization expense related to intangible assets [Abstract] |  |
2018 | 47,200 |
2019 | 45,600 |
2020 | 41,100 |
2021 | 38,400 |
2022 | 33,900 |
Brands and Trademarks [Member] |  |
Intangible assets with indefinite lives [Abstract] |  |
Cost | 135,061 | 147,683
Content and Publishing Rights [Member] |  |
Intangible assets with indefinite lives [Abstract] |  |
Cost | 84,173 | 87,202
Content and Publishing Rights [Member] |  |
Intangible assets with determinable lives [Abstract] |  |
Cost | 775,520 | 790,055
Accumulated amortization | (353,923) | (333,174)
Intangible assets (excluding goodwill) [Abstract] |  |
Accumulated amortization | (353,923) | (333,174)
Customer Relationships [Member] |  |
Intangible assets with determinable lives [Abstract] |  |
Cost | 233,872 | 224,839
Accumulated amortization | (64,756) | (54,677)
Intangible assets (excluding goodwill) [Abstract] |  |
Accumulated amortization | (64,756) | (54,677)
Brands and Trademarks [Member] |  |
Intangible assets with determinable lives [Abstract] |  |
Cost | 35,554 | 30,116
Accumulated amortization | (18,359) | (15,713)
Intangible assets (excluding goodwill) [Abstract] |  |
Accumulated amortization | (18,359) | (15,713)
Covenants Not to Compete [Member] |  |
Intangible assets with determinable lives [Abstract] |  |
Cost | 2,377 | 1,687
Accumulated amortization | (1,420) | (1,011)
Intangible assets (excluding goodwill) [Abstract] |  |
Accumulated amortization | $ (1,420) | $ (1,011)

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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