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Changes in Carrying Value of Goodwill By Reportable Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | $ 576,865 | $ 590,072
Adjustments |  |  | (8,179)
Exchange rate fluctuations |  | 7,357 | (5,028)
Goodwill, Ending Balance | [1] | 584,222 | 576,865
Operating Segments | Executive Search |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 92,149 | 95,485
Exchange rate fluctuations |  | 4,081 | (3,336)
Goodwill, Ending Balance | [1] | 96,230 | 92,149
Operating Segments | Executive Search | North America |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 46,201 | 48,320
Exchange rate fluctuations |  | 1,556 | (2,119)
Goodwill, Ending Balance | [1] | 47,757 | 46,201
Operating Segments | Executive Search | EMEA |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 44,976 | 46,193
Exchange rate fluctuations |  | 2,525 | (1,217)
Goodwill, Ending Balance | [1] | 47,501 | 44,976
Operating Segments | Executive Search | Asia Pacific |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 972 | 972
Goodwill, Ending Balance | [1] | 972 | 972
Operating Segments | Hay Group |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 457,241 | 465,937
Adjustments |  |  | (8,179)
Exchange rate fluctuations |  | 928 | (517)
Goodwill, Ending Balance | [1] | 458,169 | 457,241
Operating Segments | Futurestep |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 27,475 | 28,650
Exchange rate fluctuations |  | 2,348 | (1,175)
Goodwill, Ending Balance | [1] | $ 29,823 | $ 27,475
[1] | As of the end of the fiscal year.

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