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Restructuring and Related 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, 2021	Apr. 30, 2020	Apr. 30, 2019
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)	[1]			$ 33,310	$ 32,607	$ 3,118
Charges			$ 18,300
Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				33,449	32,813
Restructuring and related charges incurred to date				66,262
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 (credit)				11,531	26,864
Restructuring and related charges incurred to date				38,395
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 (credit)				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 (credit)				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 (credit)				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 (credit)				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 (credit)				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 (credit)				500
Business Optimization Program [Member] | Facility Related Charges [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				3,684	3,986
Restructuring and related charges incurred to date				7,670
Business Optimization Program [Member] | Other Activities [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				(62)	1,802
Restructuring and related charges incurred to date				1,740
Restructuring and Reinvestment Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				(139)	(206)	3,118
Restructuring and related charges incurred to date				169,283
Restructuring and Reinvestment Program [Member] | Severance and Termination Benefits [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				(139)	(250)	1,456
Restructuring and related charges incurred to date				115,870
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				0	(171)	526
Restructuring and related charges incurred to date				20,984
Restructuring and Reinvestment Program [Member] | Other Activities [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				0	215	1,136
Restructuring and related charges incurred to date				32,429
Research Publishing & Platforms [Member] | Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				99	3,546
Restructuring and related charges incurred to date				3,645
Research Publishing & Platforms [Member] | Restructuring and Reinvestment Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				(135)	340	1,131
Restructuring and related charges incurred to date				26,749
Academic & Professional Learning [Member] | Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				3,229	10,475
Restructuring and related charges incurred to date				13,704
Academic & Professional Learning [Member] | Restructuring and Reinvestment Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				274	(5)	1,139
Restructuring and related charges incurred to date				43,108
Education Services [Member] | Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				531	3,774
Restructuring and related charges incurred to date				4,305
Education Services [Member] | Restructuring and Reinvestment Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				0	(103)	389
Restructuring and related charges incurred to date				3,764
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				(278)	(438)	$ 459
Restructuring and related charges incurred to date				95,662
Corporate Expenses [Member] | Business Optimization Program [Member]
Summary of pretax restructuring (credits) charges [Abstract]
Restructuring and related charges (credit)				29,590	$ 15,018
Restructuring and related charges incurred to date				$ 44,608
[1] See Note 7, “Restructuring and Related Charges” and Note 11, “Goodwill and Intangible Assets” for these charges by segment.

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