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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) $ in Thousands		3 Months Ended								12 Months Ended
		Apr. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2021 USD ($) Partner	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue		$ 536,300	$ 482,900	$ 491,000	$ 431,300	$ 474,700	$ 467,100	$ 466,200	$ 423,500	$ 1,941,501	$ 1,831,483	$ 1,800,069
Research Publishing & Platforms [Member] | Research Publishing [Member] | Journal Subscriptions, Open Access and Comprehensive Agreements [Member] | Product Concentration Risk [Member] | Revenue from Contract with Customers [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue percentage										77.00%
Academic & Professional Learning [Member] | Education Publishing [Member] | Print and Digital [Member] | Transferred at Point in Time [Member] | Product Concentration Risk [Member] | Revenue from Contract with Customers [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue percentage										63.00%
Academic & Professional Learning [Member] | Education Publishing [Member] | Digital Courseware [Member] | Transferred over Time [Member] | Product Concentration Risk [Member] | Revenue from Contract with Customers [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue percentage										24.00%
Academic & Professional Learning [Member] | Professional Learning [Member] | Professional Publishing, and Licensing and Other, [Member] | Transferred at Point in Time [Member] | Product Concentration Risk [Member] | Revenue from Contract with Customers [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue percentage										48.00%
Academic & Professional Learning [Member] | Professional Learning [Member] | Corporate Training and Corporate Learning [Member] | Transferred over Time [Member] | Product Concentration Risk [Member] | Revenue from Contract with Customers [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue percentage										52.00%
Education Services [Member] | Education Services OPM [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
University partners under contract | Partner										66
Education Services [Member] | IT Bootcamp Business [Member] | The Learning House, Inc. [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										$ 1,600	3,500	1,700
Operating Segments [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										1,941,501	1,831,483	1,800,069
Operating Segments [Member] | Research Publishing & Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										1,015,349	948,839	939,217
Operating Segments [Member] | Research Publishing & Platforms [Member] | Research Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										972,512	908,952	903,249
Operating Segments [Member] | Research Publishing & Platforms [Member] | Research Platforms [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										42,837	39,887	35,968
Operating Segments [Member] | Academic & Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										644,537	650,789	703,303
Operating Segments [Member] | Academic & Professional Learning [Member] | Education Publishing [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										363,870	352,188	372,018
Operating Segments [Member] | Academic & Professional Learning [Member] | Professional Learning [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										280,667	298,601	331,285
Operating Segments [Member] | Education Services [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue										281,615	231,855	157,549
Operating Segments [Member] | Education Services [Member] | Education Services OPM [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	[1]									227,700	210,882	155,819
Operating Segments [Member] | Education Services [Member] | mthree [Member]
Revenue from contracts with customers disaggregated by segment and product type [Abstract]
Revenue	[1]									$ 53,915	$ 20,973	$ 1,730
[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. The revenue for the IT bootcamp business was $1.6 million, $3.5 million and $1.7 million for the years ended April 30, 2021, 2020 and 2019, respectively. There were no changes to our total Education Services or our consolidated financial results.

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