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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | $ 423,530 | $ 410,901
Research Publishing [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 219,927 | 216,714
Research Platforms [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 9,448 | 8,603
Education Publishing [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 65,523 | 74,034
Professional Learning [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 79,335 | 82,390
Education Services [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 49,297 | 29,160
Operating Segments [Member] | Research Publishing & Platforms [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 229,375 | 225,317
Operating Segments [Member] | Research Publishing & Platforms [Member] | Research Publishing [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 219,927 | 216,714
Operating Segments [Member] | Research Publishing & Platforms [Member] | Research Platforms [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 9,448 | 8,603
Operating Segments [Member] | Education Publishing & Professional Learning [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 144,858 | 156,424
Operating Segments [Member] | Education Publishing & Professional Learning [Member] | Education Publishing [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 65,523 | 74,034
Operating Segments [Member] | Education Publishing & Professional Learning [Member] | Professional Learning [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 79,335 | 82,390
Operating Segments [Member] | Education Services [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | 49,297 | 29,160
Operating Segments [Member] | Education Services [Member] | Education Services [Member] |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |
Research Platforms | $ 49,297 | $ 29,160

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- Definition 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 + Details
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