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Summary of Restructuring Liability by Segment (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Apr. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 21,250	$ 5,962
Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,999	1,594
Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,268	5
Operating Segments | Executive Search | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	498	1,556
Operating Segments | Executive Search | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	50	33
Operating Segments | Executive Search | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	183
Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	18,924	4,123
Operating Segments | Futurestep
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	204	245
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	123
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	11,866	5,293
Severance | Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,180	1,566
Severance | Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	743
Severance | Operating Segments | Executive Search | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	414	1,533
Severance | Operating Segments | Executive Search | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6	33
Severance | Operating Segments | Executive Search | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	17
Severance | Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	10,563	3,727
Severance | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	123
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	9,384	669
Facilities | Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	819	28
Facilities | Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	525	5
Facilities | Operating Segments | Executive Search | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	84	23
Facilities | Operating Segments | Executive Search | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	44
Facilities | Operating Segments | Executive Search | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	166
Facilities | Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	8,361	396
Facilities | Operating Segments | Futurestep
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 204	$ 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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