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Restructuring and Related Charges, Pre-tax Restructuring (Credits) Charges (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | $ (6,086) | $ 25,729
Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | (6,086) | 25,729
Restructuring and related charges incurred to date | 160,424 |
Restructuring and Reinvestment Program [Member] | Severance [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | (5,778) | 24,721
Restructuring and related charges incurred to date | 109,025 |
Restructuring and Reinvestment Program [Member] | Process Reengineering Consulting [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | 135 | 1,521
Restructuring and related charges incurred to date | 20,764 |
Restructuring and Reinvestment Program [Member] | Other Activities [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | (443) | (513)
Restructuring and related charges incurred to date | 30,635 |
Research [Member] | Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | (980) | 4,836
Restructuring and related charges incurred to date | 24,433 |
Publishing [Member] | Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | (668) | 7,254
Restructuring and related charges incurred to date | 38,263 |
Solutions [Member] | Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | (257) | 2,795
Restructuring and related charges incurred to date | 5,990 |
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related (credits) charges | (4,181) | $ 10,844
Restructuring and related charges incurred to date | $ 91,738 |

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