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Restructuring and Related Charges, Pre-tax Restructuring Charges (Credits) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	$ 1,920	$ 4,001	$ 4,138	$ 14,736
Business Optimization Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	2,106	3,154	4,291	14,024
Restructuring and related charges incurred to date	37,104		37,104
Business Optimization Program [Member] | Severance and Termination Benefits [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	1,683	578	2,793	11,287
Restructuring and related charges incurred to date	29,657		29,657
Business Optimization Program [Member] | Operating Lease Right-of-use Asset Impairment [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	0	0	0	161
Restructuring and related charges incurred to date	161		161
Business Optimization Program [Member] | Facility Related Charges [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	423	1,240	1,498	1,240
Restructuring and related charges incurred to date	5,484		5,484
Business Optimization Program [Member] | Other Activities [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	0	1,336	0	1,336
Restructuring and related charges incurred to date	1,802		1,802
Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	(186)	847	(153)	712
Restructuring and related charges incurred to date	169,269		169,269
Restructuring and Reinvestment Program [Member] | Severance and Termination Benefits [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	(186)	847	(153)	497
Restructuring and related charges incurred to date	115,856		115,856
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	0	0	0	0
Restructuring and related charges incurred to date	20,984		20,984
Restructuring and Reinvestment Program [Member] | Other Activities [Member]
Summary of pre-tax restructuring (credits) charges [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 (credits) charges [Abstract]
Restructuring and related charges (credits)	(103)	29	(300)	2,665
Restructuring and related charges incurred to date	3,246		3,246
Research Publishing & Platforms [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	(135)	697	(135)	681
Restructuring and related charges incurred to date	26,749		26,749
Academic & Professional Learning [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	1,541	765	1,314	3,542
Restructuring and related charges incurred to date	11,789		11,789
Academic & Professional Learning [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	0	35	260	63
Restructuring and related charges incurred to date	43,094		43,094
Education Services [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	84	(475)	223	1,717
Restructuring and related charges incurred to date	3,997		3,997
Education Services [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [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 (credits) charges [Abstract]
Restructuring and related charges (credits)	584	2,835	3,054	6,100
Restructuring and related charges incurred to date	18,072		18,072
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related charges (credits)	(51)	$ 115	(278)	$ 71
Restructuring and related charges incurred to date	$ 95,662		$ 95,662

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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
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-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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