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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | $ 467,131 | $ 449,367 | $ 1,356,866 | $ 1,308,890
Operating Segments [Member] | Research Publishing & Platforms [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 233,556 | 227,037 | 697,640 | 681,429
Operating Segments [Member] | Research Publishing & Platforms [Member] | Research Publishing [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 223,393 | 217,973 | 668,405 | 654,397
Operating Segments [Member] | Research Publishing & Platforms [Member] | Research Platforms [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 10,163 | 9,064 | 29,235 | 27,032
Operating Segments [Member] | Academic and Professional Learning [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 178,278 | 176,123 | 500,861 | 522,217
Operating Segments [Member] | Academic and Professional Learning [Member] | Education Publishing [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 100,982 | 95,562 | 268,246 | 277,070
Operating Segments [Member] | Academic and Professional Learning [Member] | Professional Learning [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 77,296 | 80,561 | 232,615 | 245,147
Operating Segments [Member] | Education Services [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 55,297 | 46,207 | 158,365 | 105,244
Operating Segments [Member] | Education Services [Member] | Education Services [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 50,776 | 46,207 | 153,844 | 105,244
Operating Segments [Member] | Education Services [Member] | mthree [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | $ 4,521 | $ 0 | $ 4,521 | $ 0

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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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