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Revenue Recognition, Contracts with Customers, Description of Revenue Generating Activities (Details)
3 Months Ended 9 Months Ended
Jan. 31, 2018
Journal
Jan. 31, 2019
Segment
Asset
Language
Description of Revenue Generating Activities [Abstract]    
Number of reportable segments | Segment   3
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