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Summary of Restructuring Liability by Segment (Detail) - USD ($) $ in Thousands | Jul. 31, 2016 | Apr. 30, 2016
--- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | $ 21,250 | $ 5,962
Operating Segments | Executive Search |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 1,999 | 1,594
Operating Segments | Executive Search | North America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 1,268 | 5
Operating Segments | Executive Search | EMEA |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 498 | 1,556
Operating Segments | Executive Search | Asia Pacific |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 50 | 33
Operating Segments | Executive Search | Latin America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 183 |
Operating Segments | Hay Group |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 18,924 | 4,123
Operating Segments | Futurestep |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 204 | 245
Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 123 |
Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 11,866 | 5,293
Severance | Operating Segments | Executive Search |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 1,180 | 1,566
Severance | Operating Segments | Executive Search | North America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 743 |
Severance | Operating Segments | Executive Search | EMEA |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 414 | 1,533
Severance | Operating Segments | Executive Search | Asia Pacific |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 6 | 33
Severance | Operating Segments | Executive Search | Latin America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 17 |
Severance | Operating Segments | Hay Group |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 10,563 | 3,727
Severance | Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 123 |
Facilities |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 9,384 | 669
Facilities | Operating Segments | Executive Search |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 819 | 28
Facilities | Operating Segments | Executive Search | North America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 525 | 5
Facilities | Operating Segments | Executive Search | EMEA |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 84 | 23
Facilities | Operating Segments | Executive Search | Asia Pacific |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 44 |
Facilities | Operating Segments | Executive Search | Latin America |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 166 |
Facilities | Operating Segments | Hay Group |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | 8,361 | 396
Facilities | Operating Segments | Futurestep |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Reserve | $ 204 | $ 245

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