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Restructuring Charges, Net - Summary of Restructuring Liability by Segment (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 3,996	$ 13,695	$ 5,962
Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	260	870
Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	254	384
Operating Segments | Executive Search | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		393
Operating Segments | Executive Search | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6	6
Operating Segments | Executive Search | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		87
Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3,653	12,693
Operating Segments | Futurestep
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	83	132
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,051	5,341	5,293
Severance | Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		527
Severance | Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		134
Severance | Operating Segments | Executive Search | EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		393
Severance | Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,051	4,814
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,945	8,354	$ 669
Facilities | Operating Segments | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	260	343
Facilities | Operating Segments | Executive Search | North America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	254	250
Facilities | Operating Segments | Executive Search | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6	6
Facilities | Operating Segments | Executive Search | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		87
Facilities | Operating Segments | Hay Group
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,602	7,879
Facilities | Operating Segments | Futurestep
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 83	$ 132

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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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