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Acquisitions (Details) $ in Thousands, Article in Millions		3 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) Employee Journal Article WebSite SocietyandPublisher	Jul. 31, 2017 USD ($)	Jul. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Apr. 30, 2017 USD ($)
Business Acquisition [Line Items]
Cash paid for acquisition, net of cash acquired		$ 4,413	$ 8,600
Revenue		411,444	404,285
Product development assets		68,773	39,239		$ 70,955
Goodwill		996,000	916,690		$ 982,101
Operating income (loss)		14,500	$ 43,814
Atypon Systems Inc [Member]
Business Acquisition [Line Items]
Cash paid for acquisition, net of cash acquired	$ 121,000
Number of employees | Employee	260
Revenue		$ 8,300
Goodwill	$ 70,000
Working capital	3,000
Estimated useful life of intangible assets acquired		12 years
Operating income (loss)		$ (500)
Atypon Systems Inc [Member] | Minimum [Member]
Business Acquisition [Line Items]
Revenue				$ 31,000
Atypon Systems Inc [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets	14,000
Atypon Systems Inc [Member] | Software [Member]
Business Acquisition [Line Items]
Intangible assets	28,000
Atypon Systems Inc [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets	$ 6,000
Atypon Systems Inc [Member] | Literatum [Member]
Business Acquisition [Line Items]
Number of journals hosted | Journal	9,000
Number of journal articles hosted | Article	13
Atypon Systems Inc [Member] | Literatum [Member] | Minimum [Member]
Business Acquisition [Line Items]
Number of publication web sites hosted | WebSite	1,800
Number of societies and publishers hosted | SocietyandPublisher	1,500

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