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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, 2021 | Apr. 30, 2020
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 613,943 | $ 578,298
Business acquisitions adjustment, increase in goodwill | 2,643 |
Additions |  | 38,926
Exchange rate fluctuations | 10,083 | (3,281)
Goodwill, Ending Balance | 626,669 | 613,943
Operating Segments | Consulting |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 173,014 | 173,147
Exchange rate fluctuations | 396 | (133)
Goodwill, Ending Balance | 173,410 | 173,014
Operating Segments | Executive Search | North America |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 45,721 | 46,571
Exchange rate fluctuations | 2,777 | (850)
Goodwill, Ending Balance | 48,498 | 45,721
Operating Segments | Executive Search | EMEA |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 44,494 | 45,480
Exchange rate fluctuations | 2,955 | (986)
Goodwill, Ending Balance | 47,449 | 44,494
Operating Segments | Executive Search | Asia Pacific |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 972 | 972
Goodwill, Ending Balance | 972 | 972
Operating Segments | Digital |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 322,727 | 284,214
Business acquisitions adjustment, increase in goodwill | 2,643 |
Additions |  | 38,926
Exchange rate fluctuations | 1,258 | (413)
Goodwill, Ending Balance | 326,628 | 322,727
Operating Segments | RPO & Professional Search |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 27,015 | 27,914
Exchange rate fluctuations | 2,697 | (899)
Goodwill, Ending Balance | $ 29,712 | $ 27,015

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