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Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		63 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ 25,729	$ (920)
Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	25,729	(920)	$ 163,673
Restructuring and Reinvestment Program [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	24,721	257	112,311
Restructuring and Reinvestment Program [Member] | Process Reengineering Consulting [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	1,521	7	20,335
Restructuring and Reinvestment Program [Member] | Other Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	(513)	(1,184)	31,027
Research [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	4,836	(69)	24,992
Publishing [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	7,254	353	39,743
Solutions [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	2,795	0	5,346
Shared Services [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ 10,844	$ (1,204)	$ 93,592

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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