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Restructuring Charges, Net - Summary of Restructuring Liability by Segment (Detail) - USD ($) $ in Thousands | Jan. 31, 2018 | Oct. 31, 2017 | Apr. 30, 2017
--- | --- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | $ 5,141 | $ 6,257 | $ 13,695
Operating Segments | Executive Search |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 267 |  | 870
Operating Segments | Executive Search | North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 262 |  | 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 | 5 |  | 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 | 4,773 |  | 12,693
Operating Segments | Futurestep |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 101 |  | 132
Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 1,433 | 1,541 | 5,341
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 | 1,433 |  | 4,814
Facilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 3,708 | $ 4,716 | 8,354
Facilities | Operating Segments | Executive Search |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 267 |  | 343
Facilities | Operating Segments | Executive Search | North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 262 |  | 250
Facilities | Operating Segments | Executive Search | Asia Pacific |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 5 |  | 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 | 3,340 |  | 7,879
Facilities | Operating Segments | Futurestep |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | $ 101 |  | $ 132

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