Amount of negative working capital recognized as of the acquisition date.

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The amount of working capital recognized as of the acquisition date.

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No definition available.

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- Definition

Represents number of countries in which enterprise serves the end users.

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No definition available.

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Refers to the number of employees of the entity.

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No definition available.

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Represents number of end-users served by enterprise during the period.

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No definition available.

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Refers to the number of journal articles hosts by the entity.

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No definition available.

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Refers to the number of journals hosted by the entity.

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No definition available.

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Represents number of languages in which training program provided during the period.

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No definition available.

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Refers to number of learning objects.

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No definition available.

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Refers to the number of publication web sites hosted by the entity.

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No definition available.

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Refers to the number of societies and publishers hosted by the entity.

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No definition available.

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Represents the percentage of the world's English-language scholarly journals hosted by e-publishing platform of the entity.

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No definition available.

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Product development assets consist of composition costs and royalty advances to authors. Composition costs, primarily represent the costs incurred to bring an edited commercial manuscript to publication including typesetting, proofreading, design and illustration, etc. Royalty advances to authors are capitalized and, upon publication, are recovered as royalties earned by the authors based on sales of the published works.

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No definition available.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The net result for the period of deducting operating expenses from operating revenues.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Acquisitions (Details) $ in Thousands, EndUser in Millions, Article in Millions			12 Months Ended
	Sep. 30, 2016 USD ($) Employee Journal Article WebSite SocietyandPublisher	May 01, 2014 USD ($) Object Language EndUser Country	Apr. 30, 2017 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	May 02, 2014 USD ($)
Business Acquisition [Line Items]
Cash, net of cash acquired			$ 154,766	$ 20,418		$ 172,229
Product development assets			99,275	72,126
Goodwill			982,101	951,663
Revenue			1,718,530	1,727,037		1,822,440
Operating income (loss)			206,153	188,113		237,739
Publication Rights for Society Journals [Member]
Business Acquisition [Line Items]
Acquisition related costs			$ 34,000	20,000		6,000
Atypon Systems Inc [Member]
Business Acquisition [Line Items]
Cash, net of cash acquired	$ 121,000
Number of employees \| Employee	260
Goodwill	$ 70,000
Working capital	3,000
Estimated useful life of intangible assets acquired			12 years
Revenue			$ 19,100
Operating income (loss)			$ (3,500)
Atypon Systems Inc [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Revenue					$ 31,000
Atypon Systems Inc [Member] \| Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets	6,000
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]
Product development assets	$ 28,000
Atypon Systems Inc [Member] \| Literatum [Member]
Business Acquisition [Line Items]
Number of journals hosted \| Journal	9,000
Number of journal articles hosted \| Article	13
Percentage of World's English-language Scholarly Journals Hosted by e-publishing Platform	33.33%
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
CrossKnowledge [Member]
Business Acquisition [Line Items]
Cash, net of cash acquired		$ 166,000
Number of learning objects \| Object		19,000
Intangible assets							$ 63,000
Number of languages in which training program provided \| Language		17
Number of end-users served by enterprise \| EndUser		7
Number of countries in which enterprise serves the end users \| Country		80
Purchase price allocation, long-term deferred tax liabilities							21,500
Purchase price allocation, technology							6,300
Goodwill							122,500
Negative working capital							$ 4,300
Estimated useful life of intangible assets acquired			15 years
Revenue			$ 60,100	$ 50,700		$ 42,000