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Summary of Restructuring Liability by Segment (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 11,931	$ 21,250	$ 5,962
Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	945		1,594
Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	678		5
Operating Segments | Executive Search | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	163		1,556
Operating Segments | Executive Search | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	9		33
Operating Segments | Executive Search | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	95
Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	10,813		4,123
Operating Segments | Futurestep
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	167		245
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	5,005	11,866	5,293
Severance | Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	537		1,566
Severance | Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	412
Severance | Operating Segments | Executive Search | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	119		1,533
Severance | Operating Segments | Executive Search | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6		33
Severance | Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4,462		3,727
Severance | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6,926	$ 9,384	669
Facilities | Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	408		28
Facilities | Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	266		5
Facilities | Operating Segments | Executive Search | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	44		23
Facilities | Operating Segments | Executive Search | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3
Facilities | Operating Segments | Executive Search | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	95
Facilities | Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6,351		396
Facilities | Operating Segments | Futurestep
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 167		$ 245

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+ References

No definition available.

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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