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Restructuring and Related (Credits) Charges, Pretax Restructuring Charges (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
		Nov. 30, 2020	Jan. 31, 2021	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	[1]			$ (1,427)	$ 33,310	$ 32,607
Charges			$ 18,300
Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				(1,427)	33,449	32,813
Restructuring and related charges incurred to date				64,835
Percentage reduction in real estate square footage occupancy		12.00%
Charges			$ 18,300
Fair value of operating lease ROU assets and property and equipment immediately subsequent to impairment				7,500
Business Optimization Program [Member] | Severance and Termination Benefits [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				(3,276)	11,531	26,864
Restructuring and related charges incurred to date				35,119
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 charges (credits)				0	14,918	161
Restructuring and related charges incurred to date				15,079
Business Optimization Program [Member] | Impairment of Operating Lease ROU Assets Related to Certain Leases [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				10,600
Business Optimization Program [Member] | Impairment of Operating Lease ROU Assets Related to Property and Equipment [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				4,300
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 charges (credits)				0	3,378	0
Restructuring and related charges incurred to date				3,378
Business Optimization Program [Member] | Acceleration of Expense of Operating Lease ROU Assets Related to Certain Leases [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				2,900
Business Optimization Program [Member] | Acceleration of Expense of Operating Lease ROU Assets Related to Property and Equipment [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				500
Business Optimization Program [Member] | Facility Related Charges [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				1,849	3,684	3,986
Restructuring and related charges incurred to date				9,519
Business Optimization Program [Member] | Other Activities [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				0	(62)	1,802
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 charges (credits)				237	99	3,546
Restructuring and related charges incurred to date				3,882
Academic & Professional Learning [Member] | Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				(454)	3,229	10,475
Restructuring and related charges incurred to date				13,250
Education Services [Member] | Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				8	531	3,774
Restructuring and related charges incurred to date				4,313
Corporate Expenses [Member] | Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)				(1,218)	$ 29,590	$ 15,018
Restructuring and related charges incurred to date				$ 43,390
[1] See Note 7, “Restructuring and Related (Credits) Charges” and Note 11, “Goodwill and Intangible Assets” for these charges by segment.

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