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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, 2019 | Jul. 31, 2018
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | $ 10,735 | $ (6,086)
Business Optimization Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 10,870 |
Business Optimization Program [Member] | Severance and Termination Benefits [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 10,709 |
Business Optimization Program [Member] | Operating Lease Right-of-use Asset Impairment [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 161 |
Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | (135) | (6,086)
Restructuring and related charges incurred to date | 169,493 |
Restructuring and Reinvestment Program [Member] | Severance and Termination Benefits [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | (350) | (5,778)
Restructuring and related charges incurred to date | 115,909 |
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 0 | 135
Restructuring and related charges incurred to date | 21,155 |
Restructuring and Reinvestment Program [Member] | Other Activities [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 215 | (443)
Restructuring and related charges incurred to date | 32,429 |
Research Publishing & Platforms [Member] | Business Optimization Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 2,636 |
Research Publishing & Platforms [Member] | Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | (16) | (980)
Restructuring and related charges incurred to date | 26,528 |
Education Publishing & Professional Learning [Member] | Business Optimization Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 2,777 |
Education Publishing & Professional Learning [Member] | Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 28 | (717)
Restructuring and related charges incurred to date | 42,867 |
Education Services [Member] | Business Optimization Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 2,192 |
Education Services [Member] | Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | (103) | (208)
Restructuring and related charges incurred to date | 3,764 |
Corporate Expenses [Member] | Business Optimization Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | 3,265 |
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member] |  |
Summary of pre-tax restructuring (credits) charges [Abstract] |  |
Restructuring and related charges (credits) | (44) | $ (4,181)
Restructuring and related charges incurred to date | $ 96,334 |

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