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Restructuring and Related Charges, Pre-tax Restructuring Charges (Credits) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		$ 20,675	$ 3,298	$ 24,813	$ 18,034
Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		20,661	3,793	24,952	17,817
Restructuring and related charges incurred to date		57,765		57,765
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		7,500
Business Optimization Program [Member] | Severance and Termination Benefits [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		825	2,313	3,618	13,600
Restructuring and related charges incurred to date		30,482		30,482
Business Optimization Program [Member] | Impairment of Operating Lease ROU Assets and Property and Equipment [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		14,924	0	14,924	161
Restructuring and related charges incurred to date		15,085		15,085
Business Optimization Program [Member] | Impairment of Operating Lease ROU Assets Related to Certain Leases [Member]
Summary of pre-tax restructuring charges (credits) [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 pre-tax restructuring charges (credits) [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 pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		3,378	0	3,378	0
Restructuring and related charges incurred to date		3,378		3,378
Business Optimization Program [Member] | Acceleration of Expense of Operating Lease ROU Assets Related to Certain Leases [Member]
Summary of pre-tax restructuring charges (credits) [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 pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		500
Business Optimization Program [Member] | Facility Related Charges [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		1,614	1,480	3,112	2,720
Restructuring and related charges incurred to date		7,098		7,098
Business Optimization Program [Member] | Other Activities [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		(80)	0	(80)	1,336
Restructuring and related charges incurred to date		1,722		1,722
Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		14	(495)	(139)	217
Restructuring and related charges incurred to date		169,283		169,283
Restructuring and Reinvestment Program [Member] | Severance and Termination Benefits [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		14	(324)	(139)	173
Restructuring and related charges incurred to date		115,870		115,870
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		0	(171)	0	(171)
Restructuring and related charges incurred to date		20,984		20,984
Restructuring and Reinvestment Program [Member] | Other Activities [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		0	0	0	215
Restructuring and related charges incurred to date		32,429		32,429
Research Publishing & Platforms [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		83	66	(217)	2,731
Restructuring and related charges incurred to date		3,329		3,329
Research Publishing & Platforms [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		0	(26)	(135)	655
Restructuring and related charges incurred to date		26,749		26,749
Academic & Professional Learning [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		314	1,556	1,628	5,098
Restructuring and related charges incurred to date		12,103		12,103
Academic & Professional Learning [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		14	(15)	274	48
Restructuring and related charges incurred to date		43,108		43,108
Education Services [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		71	4	294	1,721
Restructuring and related charges incurred to date		4,068		4,068
Education Services [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		0	0	0	(103)
Restructuring and related charges incurred to date		3,764		3,764
Corporate Expenses [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		20,193	2,167	23,247	8,267
Restructuring and related charges incurred to date		38,265		38,265
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)		0	$ (454)	(278)	$ (383)
Restructuring and related charges incurred to date		$ 95,662		$ 95,662

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