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Restructuring and Related Charges, Pre-tax Restructuring (Credits) Charges (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges $ (348) $ 2,208 $ 3,562 $ 26,531
Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (348) 2,208 3,562 26,531
Restructuring and related charges incurred to date 170,072   170,072  
Restructuring and Reinvestment Program [Member] | Severance [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (911) 1,781 1,983 25,047
Restructuring and related charges incurred to date 116,786   116,786  
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges 301 427 526 1,948
Restructuring and related charges incurred to date 21,155   21,155  
Restructuring and Reinvestment Program [Member] | Other Activities [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges 262 0 1,053 (464)
Restructuring and related charges incurred to date 32,131   32,131  
Research [Member] | Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (51) 690 1,251 5,138
Restructuring and related charges incurred to date 26,664   26,664  
Publishing [Member] | Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (4) (392) 735 6,933
Restructuring and related charges incurred to date 39,666   39,666  
Solutions [Member] | Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges 74 1,277 914 3,447
Restructuring and related charges incurred to date 7,161   7,161  
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related (credits) charges (367) $ 633 662 $ 11,013
Restructuring and related charges incurred to date $ 96,581   $ 96,581