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Restructuring and Related Charges, Pre-tax Restructuring (Credits) Charges (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2020	Jan. 31, 2019
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	$ 3,298	$ (348)		$ 18,034	$ 3,562
Business Optimization Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	3,793			17,817
Business Optimization Program [Member] | Severance and Termination Benefits [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	2,313			13,600
Business Optimization Program [Member] | Operating Lease Right-of-use Asset Impairment [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	0			161
Business Optimization Program [Member] | Facility Related Charges [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	1,480			2,720
Business Optimization Program [Member] | Other Activities [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	0			1,336
Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	(495)	(348)	[1]	217	3,562	[1]
Restructuring and related charges incurred to date	169,845			169,845
Restructuring and Reinvestment Program [Member] | Severance and Termination Benefits [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	(324)	(911)	[1]	173	1,983	[1]
Restructuring and related charges incurred to date	116,432			116,432
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	(171)	301	[1]	(171)	526	[1]
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 (credits) charges	0	262	[1]	215	1,053	[1]
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 (credits) charges	66			2,731
Research Publishing & Platforms [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	(26)	(51)	[1]	655	1,251	[1]
Restructuring and related charges incurred to date	27,199			27,199
Academic & Professional Learning [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	1,556			5,098
Academic & Professional Learning [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	(15)	(202)	[1]	48	1,275	[1]
Restructuring and related charges incurred to date	42,887			42,887
Education Services [Member] | Business Optimization Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	4			1,721
Education Services [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	0	272	[1]	(103)	374	[1]
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 (credits) charges	2,167			8,267
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]
Summary of pre-tax restructuring (credits) charges [Abstract]
Restructuring and related (credits) charges	(454)	$ (367)	[1]	(383)	$ 662	[1]
Restructuring and related charges incurred to date	$ 95,995			$ 95,995
[1] As previously announced, we have changed our segment reporting structure to align with our strategic focus areas. See Note 10, “Segment Information,” for more details.

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

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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
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-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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-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
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-Section S99
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 420
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