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Summary of Restructuring Liability by Segment (Detail) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | $ 13,695 | $ 5,962 | $ 1,146
Operating Segments | Executive Search |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 870 | 1,594 |
Operating Segments | Executive Search | North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 384 | 5 |
Operating Segments | Executive Search | EMEA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 393 | 1,556 |
Operating Segments | Executive Search | Asia Pacific |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 6 | 33 |
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 | 12,693 | 4,123 |
Operating Segments | Futurestep |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 132 | 245 |
Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 5,341 | 5,293 | 375
Severance | Operating Segments | Executive Search |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 527 | 1,566 |
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 | 1,533 |
Severance | Operating Segments | Executive Search | Asia Pacific |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve |  | 33 |
Severance | Operating Segments | Hay Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 4,814 | 3,727 |
Facilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 8,354 | 669 | $ 771
Facilities | Operating Segments | Executive Search |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 343 | 28 |
Facilities | Operating Segments | Executive Search | North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 250 | 5 |
Facilities | Operating Segments | Executive Search | EMEA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve |  | 23 |
Facilities | Operating Segments | Executive Search | Asia Pacific |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 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 | 7,879 | 396 |
Facilities | Operating Segments | Futurestep |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | $ 132 | $ 245 |

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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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