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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 491,200 | $ 449,400 | $ 448,600 | $ 410,900 | $ 477,300 | $ 455,700 | $ 451,700 | $ 411,400 | $ 1,800,069 | $ 1,796,103 |  | $ 1,718,530 |
Journals Subscriptions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 661,055 | 677,685 |  | 639,720 |
Open Access [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 54,671 | 41,997 |  | 30,633 |
Licensing, Reprints, Backfiles and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 185,619 | 181,806 |  | 164,070 |
Publishing Technology Services (Atypon) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 35,968 | 32,907 |  | 19,066 |
STM and Professional Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 265,719 | 287,315 |  | 291,255 |
Education Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 157,579 | 187,178 |  | 196,343 |
Courseware (WileyPLUS) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 63,485 | 59,475 |  | 62,348 |
Test Preparation and Certification [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 40,606 | 35,534 |  | 35,609 |
Licensing, Distribution, Advertising and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 46,803 | 48,146 |  | 47,894 |
Education Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 157,549 | 119,131 |  | 111,638 |
Professional Assessment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 65,889 | 61,094 |  | 59,868 |
Corporate Learning [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 65,126 | 63,835 |  | 60,086 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,800,069 | 1,796,103 | [1] | 1,718,530 | [1]
Operating Segments [Member] | Research [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 937,313 | 934,395 | [1] | 853,489 | [1]
Operating Segments [Member] | Research [Member] | Journals Subscriptions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 661,055 | 677,685 |  | 639,720 |
Operating Segments [Member] | Research [Member] | Open Access [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 54,671 | 41,997 |  | 30,633 |
Operating Segments [Member] | Research [Member] | Licensing, Reprints, Backfiles and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 185,619 | 181,806 |  | 164,070 |
Operating Segments [Member] | Research [Member] | Publishing Technology Services (Atypon) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 35,968 | 32,907 |  | 19,066 |
Operating Segments [Member] | Research [Member] | STM and Professional Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Research [Member] | Education Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Research [Member] | Courseware (WileyPLUS) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Research [Member] | Test Preparation and Certification [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Research [Member] | Licensing, Distribution, Advertising and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Research [Member] | Education Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Research [Member] | Professional Assessment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Research [Member] | Corporate Learning [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 574,192 | 617,648 | [1] | 633,449 | [1]
Operating Segments [Member] | Publishing [Member] | Journals Subscriptions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Publishing [Member] | Open Access [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Publishing [Member] | Licensing, Reprints, Backfiles and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Publishing [Member] | Publishing Technology Services (Atypon) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Publishing [Member] | STM and Professional Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 265,719 | 287,315 |  | 291,255 |
Operating Segments [Member] | Publishing [Member] | Education Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 157,579 | 187,178 |  | 196,343 |
Operating Segments [Member] | Publishing [Member] | Courseware (WileyPLUS) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 63,485 | 59,475 |  | 62,348 |
Operating Segments [Member] | Publishing [Member] | Test Preparation and Certification [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 40,606 | 35,534 |  | 35,609 |
Operating Segments [Member] | Publishing [Member] | Licensing, Distribution, Advertising and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 46,803 | 48,146 |  | 47,894 |
Operating Segments [Member] | Publishing [Member] | Education Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Publishing [Member] | Professional Assessment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Publishing [Member] | Corporate Learning [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 288,564 | 244,060 | [1] | 231,592 | [1]
Operating Segments [Member] | Solutions [Member] | Journals Subscriptions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | Open Access [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | Licensing, Reprints, Backfiles and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | Publishing Technology Services (Atypon) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | STM and Professional Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | Education Publishing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | Courseware (WileyPLUS) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | Test Preparation and Certification [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | Licensing, Distribution, Advertising and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Operating Segments [Member] | Solutions [Member] | Education Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 157,549 | 119,131 |  | 111,638 |
Operating Segments [Member] | Solutions [Member] | Professional Assessment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 65,889 | 61,094 |  | 59,868 |
Operating Segments [Member] | Solutions [Member] | Corporate Learning [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 65,126 | $ 63,835 |  | $ 60,086 |
[1] | Due to the retrospective adoption of ASU 2017-07, total net benefits (costs) of $8.1 million and $(5.3) million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest Income and Other for the years ended April 30, 2018 and 2017, respectively. Refer to Note 2, "Summary of Significant Accounting Policies, Recently Issued, and Recently Adopted Accounting Standards," for more information. The impact of the reclassification on Contribution to Profit by segment for the year ended April 30, 2018 was $4.2 million in Research, $2.3 million in Publishing, and $1.6 million in Corporate expenses. The impact of the reclassification on Contribution to Profit by segment for the year ended April 30, 2017 was $1.6 million in Research, $1.2 million in Publishing, and $(8.1) million in Corporate expenses.

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