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Revenue Recognition, Contracts with Customers, Description of Revenue Generating Activities (Details) | 3 Months Ended | 6 Months Ended
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Oct. 31, 2017 Journal | Oct. 31, 2018 Segment Asset Language
Description of Revenue Generating Activities [Abstract] |  |
Number of reportable segments | Segment |  | 3
Number of languages available for learning contracts | Language |  | 17
Journal Subscriptions [Member] |  |
Description of Revenue Generating Activities [Abstract] |  |
Number of academic research journals published | Journal | 1,700 |
Duration of contract |  | 1 year
Test Preparation and Certification [Member] |  |
Description of Revenue Generating Activities [Abstract] |  |
Duration of contract |  | 3 years
Professional Assessment [Member] |  |
Description of Revenue Generating Activities [Abstract] |  |
Duration of contract |  | 1 year
Minimum [Member] |  |
Description of Revenue Generating Activities [Abstract] |  |
Number of content assets available for corporate learning contracts | Asset |  | 20,000
Minimum [Member] | Publishing Technology Services [Member] |  |
Description of Revenue Generating Activities [Abstract] |  |
Duration of contract |  | 2 years
Minimum [Member] | Education Services [Member] |  |
Description of Revenue Generating Activities [Abstract] |  |
Duration of contract |  | 7 years
Maximum [Member] | Publishing Technology Services [Member] |  |
Description of Revenue Generating Activities [Abstract] |  |
Duration of contract |  | 5 years
Maximum [Member] | Education Services [Member] |  |
Description of Revenue Generating Activities [Abstract] |  |
Duration of contract |  | 10 years

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- Definition The duration of contracts in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The number of content assets available for corporate learning contracts including learning formats and modules such as leadership, diversity, value creation, client orientation, change and corporate strategy. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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