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Segment Information, Total Revenue by Product/Service (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Revenue from External Customer [Line Items] |  |  |
Revenue | $ 1,718,530 | $ 1,727,037 | $ 1,822,440
Journals [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue | 834,423 | 826,778 | 894,690
Platform Services (Atypon) [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue | 19,066 | 0 | 0
Books and Reference Material [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue | 487,598 | 560,973 | 643,138
Course Workflow [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue | 62,348 | 58,519 | 54,200
Online Program Management [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue | 111,638 | 96,469 | 81,593
Professional Assessment [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue | 59,868 | 57,370 | 57,035
Corporate Learning [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue | 60,086 | 50,692 | 42,017
Other [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Revenue | $ 83,503 | $ 76,236 | $ 49,767

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