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Restructuring and Related Charges, Pre-tax Restructuring Charges (Credits) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	$ 2,218	$ 10,735
Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	2,185	10,870
Restructuring and related charges incurred to date	34,998
Business Optimization Program [Member] | Severance and Termination Benefits [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	1,110	10,709
Restructuring and related charges incurred to date	27,974
Business Optimization Program [Member] | Operating Lease Right-of-use Asset Impairment [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	0	161
Restructuring and related charges incurred to date	161
Business Optimization Program [Member] | Facility Related Charges [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	1,075	0
Restructuring and related charges incurred to date	5,061
Business Optimization Program [Member] | Other Activities [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	0	0
Restructuring and related charges incurred to date	1,802
Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	33	(135)
Restructuring and related charges incurred to date	169,455
Restructuring and Reinvestment Program [Member] | Severance and Termination Benefits [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	33	(350)
Restructuring and related charges incurred to date	116,042
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	0
Restructuring and related charges incurred to date	20,984
Restructuring and Reinvestment Program [Member] | Other Activities [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	0	215
Restructuring and related charges incurred to date	32,429
Research Publishing & Platforms [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	(197)	2,636
Restructuring and related charges incurred to date	3,349
Research Publishing & Platforms [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	0	(16)
Restructuring and related charges incurred to date	26,884
Academic & Professional Learning [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	(227)	2,777
Restructuring and related charges incurred to date	10,248
Academic & Professional Learning [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	260	28
Restructuring and related charges incurred to date	43,094
Education Services [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	139	2,192
Restructuring and related charges incurred to date	3,913
Education Services [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	0	(103)
Restructuring and related charges incurred to date	3,764
Corporate Expenses [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	2,470	3,265
Restructuring and related charges incurred to date	17,488
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring charges (credits) [Abstract]
Restructuring and related charges (credits)	(227)	$ (44)
Restructuring and related charges incurred to date	$ 95,713

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Restructuring charges for research and professional development, net of related reversal of severance provisions previously recorded by the Company.

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Amount of costs incurred to date for the specified restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(d))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Subparagraph (SAB Topic 5.P.4(b)(1))
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