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Changes in Carrying Value of Goodwill By Reportable Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		Apr. 30, 2018	Apr. 30, 2017
Goodwill [Line Items]
Goodwill, Beginning Balance	[1]	$ 576,865	$ 590,072
Adjustments			(8,179)
Exchange rate fluctuations		7,357	(5,028)
Goodwill, Ending Balance	[1]	584,222	576,865
Operating Segments | Executive Search
Goodwill [Line Items]
Goodwill, Beginning Balance	[1]	92,149	95,485
Exchange rate fluctuations		4,081	(3,336)
Goodwill, Ending Balance	[1]	96,230	92,149
Operating Segments | Executive Search | North America
Goodwill [Line Items]
Goodwill, Beginning Balance	[1]	46,201	48,320
Exchange rate fluctuations		1,556	(2,119)
Goodwill, Ending Balance	[1]	47,757	46,201
Operating Segments | Executive Search | EMEA
Goodwill [Line Items]
Goodwill, Beginning Balance	[1]	44,976	46,193
Exchange rate fluctuations		2,525	(1,217)
Goodwill, Ending Balance	[1]	47,501	44,976
Operating Segments | Executive Search | Asia Pacific
Goodwill [Line Items]
Goodwill, Beginning Balance	[1]	972	972
Goodwill, Ending Balance	[1]	972	972
Operating Segments | Hay Group
Goodwill [Line Items]
Goodwill, Beginning Balance	[1]	457,241	465,937
Adjustments			(8,179)
Exchange rate fluctuations		928	(517)
Goodwill, Ending Balance	[1]	458,169	457,241
Operating Segments | Futurestep
Goodwill [Line Items]
Goodwill, Beginning Balance	[1]	27,475	28,650
Exchange rate fluctuations		2,348	(1,175)
Goodwill, Ending Balance	[1]	$ 29,823	$ 27,475
[1] As of the end of the fiscal year.

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 50
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+ References

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-Publisher FASB
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-SubTopic 10
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