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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 466,205	$ 448,622	$ 889,735	$ 859,523
Operating Segments [Member] | Research Publishing & Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	234,709	229,075	464,084	454,392
Operating Segments [Member] | Research Publishing & Platforms [Member] | Research Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	225,085	219,710	445,012	436,424
Operating Segments [Member] | Research Publishing & Platforms [Member] | Research Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	9,624	9,365	19,072	17,968
Operating Segments [Member] | Academic and Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	177,725	189,670	322,583	346,094
Operating Segments [Member] | Academic and Professional Learning [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	101,741	107,474	167,264	181,508
Operating Segments [Member] | Academic and Professional Learning [Member] | Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	75,984	82,196	155,319	164,586
Operating Segments [Member] | Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	53,771	29,877	103,068	59,037
Operating Segments [Member] | Education Services [Member] | Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 53,771	$ 29,877	$ 103,068	$ 59,037

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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