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Summary of Restructuring Liability by Segment (Detail) - USD ($) $ in Thousands | Jul. 31, 2017 | Apr. 30, 2017
--- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | $ 10,318 | $ 13,695
Operating Segments | Executive Search |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 538 | 870
Operating Segments | Executive Search | North America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 282 | 384
Operating Segments | Executive Search | EMEA |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 204 | 393
Operating Segments | Executive Search | Asia Pacific |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 3 | 6
Operating Segments | Executive Search | Latin America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 49 | 87
Operating Segments | Hay Group |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 9,651 | 12,693
Operating Segments | Futurestep |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 129 | 132
Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 2,904 | 5,341
Severance | Operating Segments | Executive Search |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 244 | 527
Severance | Operating Segments | Executive Search | North America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 40 | 134
Severance | Operating Segments | Executive Search | EMEA |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 204 | 393
Severance | Operating Segments | Hay Group |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 2,660 | 4,814
Facilities |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 7,414 | 8,354
Facilities | Operating Segments | Executive Search |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 294 | 343
Facilities | Operating Segments | Executive Search | North America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 242 | 250
Facilities | Operating Segments | Executive Search | Asia Pacific |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 3 | 6
Facilities | Operating Segments | Executive Search | Latin America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 49 | 87
Facilities | Operating Segments | Hay Group |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 6,991 | 7,879
Facilities | Operating Segments | Futurestep |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | $ 129 | $ 132

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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 + Details
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