Goodwill and Intangible Assets - Changes in Carrying Value of Goodwill By Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 909,491	$ 725,592
Additions		184,519
Exchange rate fluctuations	(1,115)	(620)
Goodwill, ending balance	908,376	909,491
ICS
Goodwill [Roll Forward]
Additions		68,300
Salo
Goodwill [Roll Forward]
Additions		116,200
Operating Segments | Consulting
Goodwill [Roll Forward]
Goodwill, beginning balance	173,093	172,970
Additions		0
Exchange rate fluctuations	(99)	123
Goodwill, ending balance	172,994	173,093
Operating Segments | Digital
Goodwill [Roll Forward]
Goodwill, beginning balance	325,558	325,354
Additions		0
Exchange rate fluctuations	(171)	204
Goodwill, ending balance	325,387	325,558
Operating Segments | North America
Goodwill [Roll Forward]
Goodwill, beginning balance	46,237	47,564
Additions		0
Exchange rate fluctuations	(83)	(1,327)
Goodwill, ending balance	46,154	46,237
Operating Segments | EMEA
Goodwill [Roll Forward]
Goodwill, beginning balance	46,401	46,572
Additions		0
Exchange rate fluctuations	(155)	(171)
Goodwill, ending balance	46,246	46,401
Operating Segments | Asia Pacific
Goodwill [Roll Forward]
Goodwill, beginning balance	972	972
Additions		0
Exchange rate fluctuations	0	0
Goodwill, ending balance	972	972
Operating Segments | Professional Search & Interim
Goodwill [Roll Forward]
Goodwill, beginning balance	254,666	69,856
Additions		184,519
Exchange rate fluctuations	(321)	291
Goodwill, ending balance	254,345	254,666
Operating Segments | RPO
Goodwill [Roll Forward]
Goodwill, beginning balance	62,564	62,304
Additions		0
Exchange rate fluctuations	(286)	260
Goodwill, ending balance	$ 62,278	$ 62,564