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Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		66 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ (1,406)	$ 6,847	$ 24,323	$ 5,927
Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	(1,406)	6,847	24,323	5,927	$ 162,267
Restructuring and Reinvestment Program [Member] | Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	(1,455)	4,322	23,266	4,579	110,856
Restructuring and Reinvestment Program [Member] | Process Reengineering Consulting [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0	0	1,521	7	20,335
Restructuring and Reinvestment Program [Member] | Other Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	49	2,525	(464)	1,341	31,076
Research [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	(388)	229	4,448	160	24,604
Publishing [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	71	215	7,325	569	39,814
Solutions [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	(625)	524	2,170	524	4,721
Shared Services [Member] | Restructuring and Reinvestment Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ (464)	$ 5,879	$ 10,380	$ 4,674	$ 93,128

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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