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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	$ 474,700	$ 467,100	$ 466,200	$ 423,500	$ 491,200	$ 449,400	$ 448,600	$ 410,900	$ 1,831,483	$ 1,800,069	$ 1,796,103
Research Publishing and Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									948,839	939,217	936,857
Research Publishing and Platforms [Member] | Research Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									908,952	903,249	903,950
Research Publishing and Platforms [Member] | Research Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									39,887	35,968	32,907
Academic & Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									650,789	703,303	740,115
Academic & Professional Learning [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									352,188	372,018	401,607
Academic & Professional Learning [Member] | Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									298,601	331,285	338,508
Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									231,855	157,549	119,131
Education Services [Member] | Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									214,376	157,549	119,131
Education Services [Member] | Mthree [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									17,479	0	0
Operating Segments [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									1,831,483	1,800,069	1,796,103
Operating Segments [Member] | Research Publishing and Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									948,839	939,217	936,857
Operating Segments [Member] | Academic & Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									650,789	703,303	740,115
Operating Segments [Member] | Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue									$ 231,855	$ 157,549	$ 119,131

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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 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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