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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, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | $ 3,298 | $ (348) |  | $ 18,034 | $ 3,562 |
Business Optimization Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 3,793 |  |  | 17,817 |  |
Business Optimization Program [Member] | Severance and Termination Benefits [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 2,313 |  |  | 13,600 |  |
Business Optimization Program [Member] | Operating Lease Right-of-use Asset Impairment [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 0 |  |  | 161 |  |
Business Optimization Program [Member] | Facility Related Charges [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 1,480 |  |  | 2,720 |  |
Business Optimization Program [Member] | Other Activities [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 0 |  |  | 1,336 |  |
Restructuring and Reinvestment Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | (495) | (348) | [1] | 217 | 3,562 | [1]
Restructuring and related charges incurred to date | 169,845 |  |  | 169,845 |  |
Restructuring and Reinvestment Program [Member] | Severance and Termination Benefits [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | (324) | (911) | [1] | 173 | 1,983 | [1]
Restructuring and related charges incurred to date | 116,432 |  |  | 116,432 |  |
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | (171) | 301 | [1] | (171) | 526 | [1]
Restructuring and related charges incurred to date | 20,984 |  |  | 20,984 |  |
Restructuring and Reinvestment Program [Member] | Other Activities [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 0 | 262 | [1] | 215 | 1,053 | [1]
Restructuring and related charges incurred to date | 32,429 |  |  | 32,429 |  |
Research Publishing & Platforms [Member] | Business Optimization Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 66 |  |  | 2,731 |  |
Research Publishing & Platforms [Member] | Restructuring and Reinvestment Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | (26) | (51) | [1] | 655 | 1,251 | [1]
Restructuring and related charges incurred to date | 27,199 |  |  | 27,199 |  |
Academic & Professional Learning [Member] | Business Optimization Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 1,556 |  |  | 5,098 |  |
Academic & Professional Learning [Member] | Restructuring and Reinvestment Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | (15) | (202) | [1] | 48 | 1,275 | [1]
Restructuring and related charges incurred to date | 42,887 |  |  | 42,887 |  |
Education Services [Member] | Business Optimization Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 4 |  |  | 1,721 |  |
Education Services [Member] | Restructuring and Reinvestment Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 0 | 272 | [1] | (103) | 374 | [1]
Restructuring and related charges incurred to date | 3,764 |  |  | 3,764 |  |
Corporate Expenses [Member] | Business Optimization Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | 2,167 |  |  | 8,267 |  |
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member] |  |  |  |  |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |  |  |  |  |
Restructuring and related (credits) charges | (454) | $ (367) | [1] | (383) | $ 662 | [1]
Restructuring and related charges incurred to date | $ 95,995 |  |  | $ 95,995 |  |
[1] | As previously announced, we have changed our segment reporting structure to align with our strategic focus areas. See Note 10, “Segment Information,” for more details.

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