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Restructuring and Related (Credits) Charges, Pre-tax Restructuring Charges (Credits) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2021 | Jul. 31, 2020
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges | [1] | $ (276) | $ 2,218
Business Optimization Program [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | (276) | 2,185
Restructuring and related charges incurred to date |  | 65,986 |
Business Optimization Program [Member] | Severance and Termination Benefits [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | (614) | 1,110
Restructuring and related charges incurred to date |  | 37,781 |
Business Optimization Program [Member] | Impairment of Operating Lease ROU Assets and Property and Equipment [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | 0 | 0
Restructuring and related charges incurred to date |  | 15,079 |
Business Optimization Program [Member] | Acceleration of Expense Related to Operating Lease ROU Assets and Property and Equipment [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | 0 | 0
Restructuring and related charges incurred to date |  | 3,378 |
Business Optimization Program [Member] | Facility Related Charges, Net [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | 338 | 1,075
Restructuring and related charges incurred to date |  | 8,008 |
Business Optimization Program [Member] | Other Activities [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | 0 | 0
Restructuring and related charges incurred to date |  | 1,740 |
Research Publishing & Platforms [Member] | Business Optimization Program [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | 216 | (197)
Restructuring and related charges incurred to date |  | 3,861 |
Academic & Professional Learning [Member] | Business Optimization Program [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | 171 | (227)
Restructuring and related charges incurred to date |  | 13,875 |
Education Services [Member] | Business Optimization Program [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | (34) | 139
Restructuring and related charges incurred to date |  | 4,271 |
Corporate Expenses [Member] | Business Optimization Program [Member] |  |  |
Summary of pretax restructuring (credits) charges [Abstract] |  |  |
Restructuring and related (credits) charges |  | (629) | $ 2,470
Restructuring and related charges incurred to date |  | $ 43,979 |
[1] | See Note 9, “Restructuring and Related (Credits) Charges” for these charges by segment.

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