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Restructuring and Related Charges, Pre-tax Restructuring Charges (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Restructuring and Related Charges [Abstract]
Restructuring charge (in dollars per share)	$ 3.1	$ 28.6	$ 13.4
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	$ 3,118	$ 28,566	$ 13,355
Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	3,118	28,566	13,355
Restructuring and related charges incurred to date	169,628
Restructuring and Reinvestment Program [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	1,456	27,213	8,386
Restructuring and related charges incurred to date	116,259
Restructuring and Reinvestment Program [Member] | Consulting and Contract Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	526	1,815	148
Restructuring and related charges incurred to date	21,155
Restructuring and Reinvestment Program [Member] | Other Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	1,136	(462)	4,821
Restructuring and related charges incurred to date	32,214
Research [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	1,131	5,257	1,949
Restructuring and related charges incurred to date	26,544
Publishing [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	650	6,443	1,596
Restructuring and related charges incurred to date	39,581
Solutions [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	878	3,695	1,787
Restructuring and related charges incurred to date	7,125
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related (credits) charges	459	$ 13,171	$ 8,023
Restructuring and related charges incurred to date	$ 96,378

X

- Definition

The per share amount of pre-tax restructuring charge recorded during the period.

+ References

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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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- Definition

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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