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Summary of Restructuring Liability by Segment (Detail) - USD ($) $ in Thousands | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016
--- | --- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | $ 11,931 | $ 21,250 | $ 5,962
Operating Segments | Executive Search |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 945 |  | 1,594
Operating Segments | Executive Search | North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 678 |  | 5
Operating Segments | Executive Search | EMEA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 163 |  | 1,556
Operating Segments | Executive Search | Asia Pacific |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 9 |  | 33
Operating Segments | Executive Search | Latin America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 95 |  |
Operating Segments | Hay Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 10,813 |  | 4,123
Operating Segments | Futurestep |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 167 |  | 245
Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 6 |  |
Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 5,005 | 11,866 | 5,293
Severance | Operating Segments | Executive Search |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 537 |  | 1,566
Severance | Operating Segments | Executive Search | North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 412 |  |
Severance | Operating Segments | Executive Search | EMEA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 119 |  | 1,533
Severance | Operating Segments | Executive Search | Asia Pacific |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 6 |  | 33
Severance | Operating Segments | Hay Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 4,462 |  | 3,727
Severance | Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 6 |  |
Facilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 6,926 | $ 9,384 | 669
Facilities | Operating Segments | Executive Search |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 408 |  | 28
Facilities | Operating Segments | Executive Search | North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 266 |  | 5
Facilities | Operating Segments | Executive Search | EMEA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 44 |  | 23
Facilities | Operating Segments | Executive Search | Asia Pacific |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 3 |  |
Facilities | Operating Segments | Executive Search | Latin America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 95 |  |
Facilities | Operating Segments | Hay Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 6,351 |  | 396
Facilities | Operating Segments | Futurestep |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | $ 167 |  | $ 245

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