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Segment Information, Total Revenue by Product/Service (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Revenue from External Customer [Line Items]
Revenue	$ 477,300	$ 455,700	$ 451,700	$ 411,400	$ 452,200	$ 436,400	$ 425,600	$ 404,300	$ 1,796,103	$ 1,718,530	$ 1,727,037
Journal Subscriptions [Member]
Revenue from External Customer [Line Items]
Revenue									677,685	639,720	622,305
Open Access [Member]
Revenue from External Customer [Line Items]
Revenue									41,997	30,633	25,671
Licensing, Reprints, Backfiles, and Other (Research Segment) [Member]
Revenue from External Customer [Line Items]
Revenue									181,806	164,070	178,802
Publishing Technology Services (Atypon) [Member]
Revenue from External Customer [Line Items]
Revenue									32,907	19,066	0
STM and Professional Publishing [Member]
Revenue from External Customer [Line Items]
Revenue									287,315	291,255	330,984
Education Publishing [Member]
Revenue from External Customer [Line Items]
Revenue									187,178	196,343	229,989
Course Workflow [Member]
Revenue from External Customer [Line Items]
Revenue									59,475	62,348	58,519
Test Preparation and Certification [Member]
Revenue from External Customer [Line Items]
Revenue									35,534	35,609	28,115
Licensing, Distribution, Advertising, and Other (Publishing Segment) [Member]
Revenue from External Customer [Line Items]
Revenue									48,146	47,894	48,121
Education Services (OPM) [Member]
Revenue from External Customer [Line Items]
Revenue									119,131	111,638	96,469
Professional Assessment [Member]
Revenue from External Customer [Line Items]
Revenue									61,094	59,868	57,370
Corporate Learning [Member]
Revenue from External Customer [Line Items]
Revenue									$ 63,835	$ 60,086	$ 50,692

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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