Segments - Financial Highlights by Operating Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 2,863,836	$ 2,643,455	$ 1,819,946
Adjusted EBITDA	457,277	538,928	286,292
Fee revenue
Segment Reporting Information [Line Items]
Total revenue	2,835,408	2,626,718	1,810,047
Operating Segments | Consulting
Segment Reporting Information [Line Items]
Total revenue	686,979	654,199	517,046
Adjusted EBITDA	108,502	116,108	81,522
Operating Segments | Digital
Segment Reporting Information [Line Items]
Total revenue	354,967	349,437	287,780
Adjusted EBITDA	97,458	110,050	86,095
Operating Segments | Executive Search | North America
Segment Reporting Information [Line Items]
Total revenue	568,212	609,258	399,104
Adjusted EBITDA	140,850	181,615	98,099
Operating Segments | Executive Search | EMEA
Segment Reporting Information [Line Items]
Total revenue	188,114	182,866	139,213
Adjusted EBITDA	31,380	31,804	11,742
Operating Segments | Executive Search | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	95,956	118,705	83,463
Adjusted EBITDA	24,222	35,105	16,676
Operating Segments | Executive Search | Latin America
Segment Reporting Information [Line Items]
Total revenue	31,054	29,079	17,500
Adjusted EBITDA	9,370	9,089	1,289
Operating Segments | Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	507,058	297,974	131,080
Adjusted EBITDA	110,879	106,015	36,934
Operating Segments | RPO
Segment Reporting Information [Line Items]
Total revenue	431,496	401,937	244,760
Adjusted EBITDA	52,588	59,126	32,477
Operating Segments | Fee revenue | Consulting
Segment Reporting Information [Line Items]
Total revenue	677,001	650,204	515,844
Operating Segments | Fee revenue | Digital
Segment Reporting Information [Line Items]
Total revenue	354,651	349,025	287,306
Operating Segments | Fee revenue | Executive Search | North America
Segment Reporting Information [Line Items]
Total revenue	562,139	605,704	397,275
Operating Segments | Fee revenue | Executive Search | EMEA
Segment Reporting Information [Line Items]
Total revenue	187,014	182,192	138,954
Operating Segments | Fee revenue | Executive Search | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	95,598	118,596	83,306
Operating Segments | Fee revenue | Executive Search | Latin America
Segment Reporting Information [Line Items]
Total revenue	31,047	29,069	17,500
Operating Segments | Fee revenue | Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	503,395	297,096	130,831
Operating Segments | Fee revenue | RPO
Segment Reporting Information [Line Items]
Total revenue	424,563	394,832	239,031
Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0	0
Adjusted EBITDA	$ (117,972)	$ (109,984)	$ (78,542)