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Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		69 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ 2,208	$ 9,118	$ 26,531	$ 15,045
Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	2,208	9,118	26,531	15,045	$ 164,475
Restructuring and Reinvestment Program [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	1,781	3,420	25,047	7,999	112,637
Restructuring and Reinvestment Program [Member] | Process Reengineering Consulting [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	427	10	1,948	16	20,762
Restructuring and Reinvestment Program [Member] | Other Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0	5,688	(464)	7,030	31,076
Research [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	690	517	5,138	677	25,294
Publishing [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	(392)	1,027	6,933	1,596	39,422
Solutions [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	1,277	1,095	3,447	1,619	5,998
Shared Services [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ 633	$ 6,479	$ 11,013	$ 11,153	$ 93,761

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=98514028&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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+ References

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