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Goodwill and Intangible Assets - Changes in Carrying Value of Goodwill By Reportable Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | $ 584,222 | $ 576,865
Exchange rate fluctuations |  | (5,924) | 7,357
Goodwill, Ending Balance | [1] | 578,298 | 584,222
Operating Segments | Executive Search |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 96,230 | 92,149
Exchange rate fluctuations |  | (3,207) | 4,081
Goodwill, Ending Balance | [1] | 93,023 | 96,230
Operating Segments | Executive Search | North America |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 47,757 | 46,201
Exchange rate fluctuations |  | (1,186) | 1,556
Goodwill, Ending Balance | [1] | 46,571 | 47,757
Operating Segments | Executive Search | EMEA |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 47,501 | 44,976
Exchange rate fluctuations |  | (2,021) | 2,525
Goodwill, Ending Balance | [1] | 45,480 | 47,501
Operating Segments | Executive Search | Asia Pacific |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 972 | 972
Goodwill, Ending Balance | [1] | 972 | 972
Operating Segments | Advisory |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | [1] | 458,169 | 457,241
Exchange rate fluctuations |  | (808) | 928
Goodwill, Ending Balance | [1] | 457,361 | 458,169
Operating Segments | RPO & Professional Search |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 29,823 | 27,475
Exchange rate fluctuations |  | (1,909) | 2,348
Goodwill, Ending Balance |  | $ 27,914 | $ 29,823
[1] | As of the end of the fiscal year.

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