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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, 2018 | Jul. 31, 2017
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | $ 410,901 | $ 411,444 | [1]
Journal Subscriptions [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 165,958 | 168,325 |
Open Access [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 10,943 | 8,803 |
Licensing, Reprints, Backfiles, and Other [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 39,488 | 38,230 |
Publishing Technology Services (Atypon) [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 8,603 | 8,269 |
STM and Professional Publishing [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 66,064 | 63,600 |
Education Publishing [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 38,231 | 45,736 |
Course Workflow (WileyPLUS) [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 778 | 1,210 |
Test Preparation and Certification [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 11,406 | 11,490 |
Licensing, Distribution, Advertising, and Other [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 8,442 | 9,242 |
Education Services (OPM) [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 29,160 | 26,337 |
Professional Assessment [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 15,799 | 14,887 |
Corporate Learning [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 16,029 | 15,315 |
Operating Segments [Member] | Research [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 224,992 | 223,627 | [1]
Operating Segments [Member] | Research [Member] | Journal Subscriptions [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 165,958 | 168,325 |
Operating Segments [Member] | Research [Member] | Open Access [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 10,943 | 8,803 |
Operating Segments [Member] | Research [Member] | Licensing, Reprints, Backfiles, and Other [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 39,488 | 38,230 |
Operating Segments [Member] | Research [Member] | Publishing Technology Services (Atypon) [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 8,603 | 8,269 |
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 |
Operating Segments [Member] | Research [Member] | Education Publishing [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 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 |
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 |
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 |
Operating Segments [Member] | Research [Member] | Education Services (OPM) [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 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 |
Operating Segments [Member] | Research [Member] | Corporate Learning [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 0 | 0 |
Operating Segments [Member] | Publishing [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 124,921 | 131,278 | [1]
Operating Segments [Member] | Publishing [Member] | Journal Subscriptions [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 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 |
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 |
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 |
Operating Segments [Member] | Publishing [Member] | STM and Professional Publishing [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 66,064 | 63,600 |
Operating Segments [Member] | Publishing [Member] | Education Publishing [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 38,231 | 45,736 |
Operating Segments [Member] | Publishing [Member] | Course Workflow (WileyPLUS) [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 778 | 1,210 |
Operating Segments [Member] | Publishing [Member] | Test Preparation and Certification [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 11,406 | 11,490 |
Operating Segments [Member] | Publishing [Member] | Licensing, Distribution, Advertising, and Other [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 8,442 | 9,242 |
Operating Segments [Member] | Publishing [Member] | Education Services (OPM) [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 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 |
Operating Segments [Member] | Publishing [Member] | Corporate Learning [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 0 | 0 |
Operating Segments [Member] | Solutions [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 60,988 | 56,539 | [1]
Operating Segments [Member] | Solutions [Member] | Journal Subscriptions [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 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 |
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 |
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 |
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 |
Operating Segments [Member] | Solutions [Member] | Education Publishing [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 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 |
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 |
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 |
Operating Segments [Member] | Solutions [Member] | Education Services (OPM) [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 29,160 | 26,337 |
Operating Segments [Member] | Solutions [Member] | Professional Assessment [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | 15,799 | 14,887 |
Operating Segments [Member] | Solutions [Member] | Corporate Learning [Member] |  |  |
Revenue from contracts with customers disaggregated by segment and product type [Abstract] |  |  |
Revenue | $ 16,029 | $ 15,315 |
[1] | Due to the retrospective adoption of ASU 2017-07, total net benefits of $1.9 million related to defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest Income and Other. Refer to Note 2, "Recent Accounting Standards," in the Notes to Condensed Consolidated Financial Statements for more information. The impact of the reclassification on Contribution to Profit by segment for the three months ended July 31, 2017 was $1.0 million in Research, $0.5 million in Publishing, and $0.4 million in Corporate expenses.

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