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Restructuring and Related (Credits) Charges, Pretax Restructuring Charges (Credits) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges [1] $ (1,333) $ 1,920 $ (1,609) $ 4,138
Business Optimization Program [Member]        
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (1,333) 2,106 (1,609) 4,291
Restructuring and related charges incurred to date 64,653   64,653  
Business Optimization Program [Member] | Severance and Termination Benefits [Member]        
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (1,956) 1,683 (2,570) 2,793
Restructuring and related charges incurred to date 35,825   35,825  
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 0 0
Restructuring and related charges incurred to date 15,079   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 0 0
Restructuring and related charges incurred to date 3,378   3,378  
Business Optimization Program [Member] | Facility Related Charges, Net [Member]        
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges 623 423 961 1,498
Restructuring and related charges incurred to date 8,631   8,631  
Business Optimization Program [Member] | Other Activities [Member]        
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges 0 0 0 0
Restructuring and related charges incurred to date 1,740   1,740  
Research Publishing & Platforms [Member] | Business Optimization Program [Member]        
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges 22 (103) 238 (300)
Restructuring and related charges incurred to date 3,883   3,883  
Academic & Professional Learning [Member] | Business Optimization Program [Member]        
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (465) 1,541 (294) 1,314
Restructuring and related charges incurred to date 13,410   13,410  
Education Services [Member] | Business Optimization Program [Member]        
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges 6 84 (28) 223
Restructuring and related charges incurred to date 4,277   4,277  
Corporate Expenses [Member] | Business Optimization Program [Member]        
Summary of pretax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (896) $ 584 (1,525) $ 3,054
Restructuring and related charges incurred to date $ 43,083   $ 43,083  
[1] See Note 9, “Restructuring and Related (Credits) Charges” for these charges by segment.