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Revenue Recognition, Contracts with Customers, Description of Revenue Generating Activities (Details)
12 Months Ended
Apr. 30, 2019
Segment
Journal
Institution
Asset
Language
Description of Revenue Generating Activities [Abstract]  
Number of reportable segments | Segment 3
Number of academic institutions | Institution 700
Number of languages available for learning contracts | Language 17
Journals 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