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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended
		Jul. 31, 2020	Jul. 31, 2019
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		$ 431,326	$ 423,530
Research Publishing & Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		240,810	229,375
Research Publishing & Platforms [Member] | Research Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		230,464	219,927
Research Publishing & Platforms [Member] | Research Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		10,346	9,448
Academic & Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		126,913	144,858
Academic & Professional Learning [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		64,084	65,523
Academic & Professional Learning [Member] | Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		62,829	79,335
Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		63,603	49,297
Education Services [Member] | Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	[1]	50,262	48,156
Education Services [Member] | Mthree [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	[1]	13,341	1,141
Operating Segments [Member] | Research Publishing & Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		240,810	229,375
Operating Segments [Member] | Academic & Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		126,913	144,858
Operating Segments [Member] | Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		$ 63,603	$ 49,297
[1] In May 2020, we moved the IT bootcamp business acquired as part of The Learning House acquisition from Education Services 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. In May 2020, we moved the IT bootcamp business acquired as part of The Learning House acquisition from Education Services 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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