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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		$ 491,011	$ 466,205	$ 922,337	$ 889,735
Research Publishing & Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		251,334	234,709	492,144	464,084
Research Publishing & Platforms [Member] | Research Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		240,691	225,085	471,155	445,012
Research Publishing & Platforms [Member] | Research Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		10,643	9,624	20,989	19,072
Academic & Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		170,590	177,725	297,503	322,583
Academic & Professional Learning [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		103,105	101,741	167,189	167,264
Academic & Professional Learning [Member] | Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		67,485	75,984	130,314	155,319
Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		69,087	53,771	132,690	103,068
Education Services [Member] | Education Services OPM [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	[1]	56,261	52,781	106,523	100,937
Education Services [Member] | Mthree [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	[1]	12,826	990	26,167	2,131
Operating Segments [Member] | Research Publishing & Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		251,334	234,709	492,144	464,084
Operating Segments [Member] | Academic & Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		170,590	177,725	297,503	322,583
Operating Segments [Member] | Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		$ 69,087	$ 53,771	$ 132,690	$ 103,068
[1] In May 2020, we moved the IT bootcamp business acquired as part of The Learning House acquisition from Education Services Online Program Management (“OPM”) to mthree. As a result, the prior period revenue related to the IT bootcamp business has been included in mthree. There were no changes to our total Education Services or our consolidated financial results.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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