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Revenue Recognition, Contracts with Customers, Description of Revenue Generating Activities (Details)	3 Months Ended
	Jul. 31, 2018 Segment Asset Language	Jul. 31, 2017 Journal
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

X

- Definition

The duration of contracts in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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+ Details

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- Definition

Number of academic research journals published during the period.

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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

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+ Details

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- Definition

Number of languages in which contents for learning formats and modules on topics are available.

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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.

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