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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 |

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