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Revenue Recognition, Contracts with Customers, Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | $ 448,622 | $ 451,731 | $ 859,523 | $ 863,175
Journal Subscriptions [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 163,751 | 170,163 | 329,709 | 338,488
Open Access [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 13,780 | 9,350 | 24,723 | 18,153
Licensing, Reprints, Backfiles and Other [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 41,749 | 41,329 | 81,237 | 79,559
Publishing Technology Services (Atypon) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 9,365 | 8,028 | 17,968 | 16,297
STM and Professional Publishing [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 66,902 | 71,460 | 132,966 | 135,060
Education Publishing [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 52,068 | 57,711 | 90,299 | 103,447
Course Workflow (WileyPLUS) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 18,429 | 16,310 | 19,207 | 17,520
Test Preparation and Certification [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 8,377 | 7,919 | 19,783 | 19,409
Licensing, Distribution, Advertising and Other [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 11,723 | 11,585 | 20,165 | 20,827
Education Services (OPM) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 29,877 | 29,737 | 59,037 | 56,074
Professional Assessment [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 17,268 | 15,821 | 33,067 | 30,708
Corporate Learning [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 15,333 | 12,318 | 31,362 | 27,633
Operating Segments [Member] | Research [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 228,645 | 228,870 | 453,637 | 452,497
Operating Segments [Member] | Research [Member] | Journal Subscriptions [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 163,751 | 170,163 | 329,709 | 338,488
Operating Segments [Member] | Research [Member] | Open Access [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 13,780 | 9,350 | 24,723 | 18,153
Operating Segments [Member] | Research [Member] | Licensing, Reprints, Backfiles and Other [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 41,749 | 41,329 | 81,237 | 79,559
Operating Segments [Member] | Research [Member] | Publishing Technology Services (Atypon) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 9,365 | 8,028 | 17,968 | 16,297
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 | 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 | 0
Operating Segments [Member] | Research [Member] | Course Workflow (WileyPLUS) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 0 | 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 | 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 | 0
Operating Segments [Member] | Research [Member] | Education Services (OPM) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 0 | 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 | 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 | 0
Operating Segments [Member] | Publishing [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 157,499 | 164,985 | 282,420 | 296,263
Operating Segments [Member] | Publishing [Member] | Journal Subscriptions [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 0 | 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 | 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 | 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 | 0
Operating Segments [Member] | Publishing [Member] | STM and Professional Publishing [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 66,902 | 71,460 | 132,966 | 135,060
Operating Segments [Member] | Publishing [Member] | Education Publishing [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 52,068 | 57,711 | 90,299 | 103,447
Operating Segments [Member] | Publishing [Member] | Course Workflow (WileyPLUS) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 18,429 | 16,310 | 19,207 | 17,520
Operating Segments [Member] | Publishing [Member] | Test Preparation and Certification [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 8,377 | 7,919 | 19,783 | 19,409
Operating Segments [Member] | Publishing [Member] | Licensing, Distribution, Advertising and Other [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 11,723 | 11,585 | 20,165 | 20,827
Operating Segments [Member] | Publishing [Member] | Education Services (OPM) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 0 | 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 | 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 | 0
Operating Segments [Member] | Solutions [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 62,478 | 57,876 | 123,466 | 114,415
Operating Segments [Member] | Solutions [Member] | Journal Subscriptions [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 0 | 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 | 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 | 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 | 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 | 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 | 0
Operating Segments [Member] | Solutions [Member] | Course Workflow (WileyPLUS) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 0 | 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 | 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 | 0
Operating Segments [Member] | Solutions [Member] | Education Services (OPM) [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 29,877 | 29,737 | 59,037 | 56,074
Operating Segments [Member] | Solutions [Member] | Professional Assessment [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | 17,268 | 15,821 | 33,067 | 30,708
Operating Segments [Member] | Solutions [Member] | Corporate Learning [Member] |  |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |  |
Revenue | $ 15,333 | $ 12,318 | $ 31,362 | $ 27,633

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