Goodwill and Intangible Assets - Changes in Carrying Value of Goodwill By Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 725,592	$ 626,669
Additions	184,519	104,962
Exchange rate fluctuations	(620)	(6,039)
Goodwill, ending balance	909,491	725,592
Lucas Group
Goodwill [Roll Forward]
Additions		76,800
Patina Solutions Group
Goodwill [Roll Forward]
Additions		28,200
Infinity Consulting Solutions
Goodwill [Roll Forward]
Additions	68,300
Salo
Goodwill [Roll Forward]
Additions	116,200
Operating Segments | Consulting
Goodwill [Roll Forward]
Goodwill, beginning balance	172,970	173,410
Additions	0	0
Exchange rate fluctuations	123	(440)
Goodwill, ending balance	173,093	172,970
Operating Segments | Digital
Goodwill [Roll Forward]
Goodwill, beginning balance	325,354	326,628
Additions	0	0
Exchange rate fluctuations	204	(1,274)
Goodwill, ending balance	325,558	325,354
Operating Segments | Executive Search | North America
Goodwill [Roll Forward]
Goodwill, beginning balance	47,564	48,498
Additions	0	0
Exchange rate fluctuations	(1,327)	(934)
Goodwill, ending balance	46,237	47,564
Operating Segments | Executive Search | EMEA
Goodwill [Roll Forward]
Goodwill, beginning balance	46,572	47,449
Additions	0	0
Exchange rate fluctuations	(171)	(877)
Goodwill, ending balance	46,401	46,572
Operating Segments | Executive Search | Asia Pacific
Goodwill [Roll Forward]
Goodwill, beginning balance	972	972
Additions	0	0
Exchange rate fluctuations	0	0
Goodwill, ending balance	972	972
Operating Segments | Professional Search & Interim
Goodwill [Roll Forward]
Goodwill, beginning balance	69,856	15,705
Additions	184,519	55,480
Exchange rate fluctuations	291	(1,329)
Goodwill, ending balance	254,666	69,856
Operating Segments | RPO
Goodwill [Roll Forward]
Goodwill, beginning balance	62,304	14,007
Additions	0	49,482
Exchange rate fluctuations	260	(1,185)
Goodwill, ending balance	$ 62,564	$ 62,304