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Restructuring and Related (Credits) Charges, Pre-tax Restructuring Charges (Credits) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges [1] $ (276) $ 2,218
Business Optimization Program [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges (276) 2,185
Restructuring and related charges incurred to date 65,986  
Business Optimization Program [Member] | Severance and Termination Benefits [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges (614) 1,110
Restructuring and related charges incurred to date 37,781  
Business Optimization Program [Member] | Impairment of Operating Lease ROU Assets and Property and Equipment [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges 0 0
Restructuring and related charges incurred to date 15,079  
Business Optimization Program [Member] | Acceleration of Expense Related to Operating Lease ROU Assets and Property and Equipment [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges 0 0
Restructuring and related charges incurred to date 3,378  
Business Optimization Program [Member] | Facility Related Charges, Net [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges 338 1,075
Restructuring and related charges incurred to date 8,008  
Business Optimization Program [Member] | Other Activities [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges 0 0
Restructuring and related charges incurred to date 1,740  
Research Publishing & Platforms [Member] | Business Optimization Program [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges 216 (197)
Restructuring and related charges incurred to date 3,861  
Academic & Professional Learning [Member] | Business Optimization Program [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges 171 (227)
Restructuring and related charges incurred to date 13,875  
Education Services [Member] | Business Optimization Program [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges (34) 139
Restructuring and related charges incurred to date 4,271  
Corporate Expenses [Member] | Business Optimization Program [Member]    
Summary of pretax restructuring (credits) charges [Abstract]    
Restructuring and related (credits) charges (629) $ 2,470
Restructuring and related charges incurred to date $ 43,979  
[1] See Note 9, “Restructuring and Related (Credits) Charges” for these charges by segment.