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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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- Definition

Amount of assets, net of accumulated impairment, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ 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)(1)
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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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth 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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third 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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second 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.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Fair value portion of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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