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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 |

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