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Restructuring and Related Charges, Pre-tax Restructuring (Credits) Charges (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) $ 10,735 $ (6,086)
Business Optimization Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 10,870  
Business Optimization Program [Member] | Severance and Termination Benefits [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 10,709  
Business Optimization Program [Member] | Operating Lease Right-of-use Asset Impairment [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 161  
Restructuring and Reinvestment Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) (135) (6,086)
Restructuring and related charges incurred to date 169,493  
Restructuring and Reinvestment Program [Member] | Severance and Termination Benefits [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) (350) (5,778)
Restructuring and related charges incurred to date 115,909  
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 0 135
Restructuring and related charges incurred to date 21,155  
Restructuring and Reinvestment Program [Member] | Other Activities [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 215 (443)
Restructuring and related charges incurred to date 32,429  
Research Publishing & Platforms [Member] | Business Optimization Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 2,636  
Research Publishing & Platforms [Member] | Restructuring and Reinvestment Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) (16) (980)
Restructuring and related charges incurred to date 26,528  
Education Publishing & Professional Learning [Member] | Business Optimization Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 2,777  
Education Publishing & Professional Learning [Member] | Restructuring and Reinvestment Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 28 (717)
Restructuring and related charges incurred to date 42,867  
Education Services [Member] | Business Optimization Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 2,192  
Education Services [Member] | Restructuring and Reinvestment Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) (103) (208)
Restructuring and related charges incurred to date 3,764  
Corporate Expenses [Member] | Business Optimization Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) 3,265  
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]    
Summary of pre-tax restructuring (credits) charges [Abstract]    
Restructuring and related charges (credits) (44) $ (4,181)
Restructuring and related charges incurred to date $ 96,334