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Restructuring and Related Charges, Pre-tax Restructuring (Credits) Charges (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) $ 9,996 $ (1,406) $ 3,910 $ 24,323
Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) 9,996 (1,406) 3,910 24,323
Restructuring and related charges incurred to date 170,420   170,420  
Restructuring and Reinvestment Program [Member] | Severance [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) 8,672 (1,455) 2,894 23,266
Restructuring and related charges incurred to date 117,697   117,697  
Restructuring and Reinvestment Program [Member] | Process Reengineering Consulting [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) 90 0 225 1,521
Restructuring and related charges incurred to date 20,854   20,854  
Restructuring and Reinvestment Program [Member] | Other Activities [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) 1,234 49 791 (464)
Restructuring and related charges incurred to date 31,869   31,869  
Research [Member] | Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) 2,282 (388) 1,302 4,448
Restructuring and related charges incurred to date 26,715   26,715  
Publishing [Member] | Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) 1,407 71 739 7,325
Restructuring and related charges incurred to date 39,670   39,670  
Solutions [Member] | Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) 1,097 (625) 840 2,170
Restructuring and related charges incurred to date 7,087   7,087  
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]        
Summary of pre-tax restructuring (credits) charges [Abstract]        
Restructuring and related charges (credits) 5,210 $ (464) 1,029 $ 10,380
Restructuring and related charges incurred to date $ 96,948   $ 96,948