Segments - Financial Highlights by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Segment Reporting Information [Line Items]
Total revenue	$ 686,845	$ 684,956	$ 2,125,712	$ 1,916,452
Adjusted EBITDA	96,111	138,331	359,422	394,543
Operating Segments | Consulting
Segment Reporting Information [Line Items]
Total revenue	164,414	163,824	508,994	478,563
Adjusted EBITDA	23,305	28,556	83,944	85,458
Operating Segments | Digital
Segment Reporting Information [Line Items]
Total revenue	85,087	90,501	263,479	259,894
Adjusted EBITDA	22,153	28,142	73,855	82,330
Operating Segments | Executive Search | North America
Segment Reporting Information [Line Items]
Total revenue	134,255	153,454	431,286	451,836
Adjusted EBITDA	30,446	45,702	112,164	137,939
Operating Segments | Executive Search | EMEA
Segment Reporting Information [Line Items]
Total revenue	49,195	47,666	141,443	133,080
Adjusted EBITDA	7,981	8,080	24,577	23,328
Operating Segments | Executive Search | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	22,694	31,448	72,669	88,447
Adjusted EBITDA	5,538	9,451	18,723	25,972
Operating Segments | Executive Search | Latin America
Segment Reporting Information [Line Items]
Total revenue	7,658	7,470	23,289	20,821
Adjusted EBITDA	2,462	2,484	7,686	6,204
Operating Segments | Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	118,616	90,198	354,430	196,832
Adjusted EBITDA	21,969	31,344	83,587	72,608
Operating Segments | RPO
Segment Reporting Information [Line Items]
Total revenue	104,926	100,395	330,122	286,979
Adjusted EBITDA	9,849	12,765	43,562	41,726
Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Adjusted EBITDA	(27,592)	(28,193)	(88,676)	(81,022)
Fee revenue
Segment Reporting Information [Line Items]
Total revenue	680,782	680,741	2,104,534	1,905,579
Fee revenue | Operating Segments | Consulting
Segment Reporting Information [Line Items]
Total revenue	162,155	162,889	501,731	476,260
Fee revenue | Operating Segments | Digital
Segment Reporting Information [Line Items]
Total revenue	85,071	90,194	263,161	259,504
Fee revenue | Operating Segments | Executive Search | North America
Segment Reporting Information [Line Items]
Total revenue	132,810	152,597	426,839	449,472
Fee revenue | Operating Segments | Executive Search | EMEA
Segment Reporting Information [Line Items]
Total revenue	48,960	47,509	140,661	132,690
Fee revenue | Operating Segments | Executive Search | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	22,621	31,425	72,410	88,385
Fee revenue | Operating Segments | Executive Search | Latin America
Segment Reporting Information [Line Items]
Total revenue	7,654	7,468	23,283	20,815
Fee revenue | Operating Segments | Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	117,980	90,015	351,670	196,411
Fee revenue | Operating Segments | RPO
Segment Reporting Information [Line Items]
Total revenue	$ 103,531	$ 98,644	$ 324,779	$ 282,042