Segments - Financial Highlights by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 735,719	$ 643,398	$ 1,438,867	$ 1,231,496
Adjusted EBITDA	131,103	134,866	263,311	256,212
Operating Segments \| Consulting
Segment Reporting Information [Line Items]
Total revenue	175,845	165,732	344,580	314,739
Adjusted EBITDA	31,089	30,061	60,639	56,902
Operating Segments \| Digital
Segment Reporting Information [Line Items]
Total revenue	94,577	88,712	178,392	169,393
Adjusted EBITDA	27,524	28,556	51,702	54,188
Operating Segments \| Executive Search \| North America
Segment Reporting Information [Line Items]
Total revenue	144,147	159,082	297,031	298,382
Adjusted EBITDA	37,969	48,907	81,718	92,237
Operating Segments \| Executive Search \| EMEA
Segment Reporting Information [Line Items]
Total revenue	44,919	42,571	92,248	85,414
Adjusted EBITDA	8,081	7,663	16,596	15,248
Operating Segments \| Executive Search \| Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	23,523	28,267	49,975	56,999
Adjusted EBITDA	5,834	8,201	13,185	16,521
Operating Segments \| Executive Search \| Latin America
Segment Reporting Information [Line Items]
Total revenue	7,822	6,572	15,631	13,351
Adjusted EBITDA	2,607	1,366	5,224	3,720
Operating Segments \| Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	135,762	54,702	235,814	106,634
Adjusted EBITDA	32,457	21,825	61,618	41,264
Operating Segments \| RPO
Segment Reporting Information [Line Items]
Total revenue	109,124	97,760	225,196	186,584
Adjusted EBITDA	16,004	14,433	33,713	28,961
Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Adjusted EBITDA	(30,462)	(26,146)	(61,084)	(52,829)
Fee revenue
Segment Reporting Information [Line Items]
Total revenue	727,849	639,443	1,423,752	1,224,838
Fee revenue \| Operating Segments \| Consulting
Segment Reporting Information [Line Items]
Total revenue	173,092	164,893	339,576	313,371
Fee revenue \| Operating Segments \| Digital
Segment Reporting Information [Line Items]
Total revenue	94,329	88,639	178,090	169,310
Fee revenue \| Operating Segments \| Executive Search \| North America
Segment Reporting Information [Line Items]
Total revenue	142,485	158,197	294,029	296,875
Fee revenue \| Operating Segments \| Executive Search \| EMEA
Segment Reporting Information [Line Items]
Total revenue	44,645	42,434	91,701	85,181
Fee revenue \| Operating Segments \| Executive Search \| Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	23,408	28,257	49,789	56,960
Fee revenue \| Operating Segments \| Executive Search \| Latin America
Segment Reporting Information [Line Items]
Total revenue	7,821	6,571	15,629	13,347
Fee revenue \| Operating Segments \| Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	134,743	54,559	233,690	106,396
Fee revenue \| Operating Segments \| RPO
Segment Reporting Information [Line Items]
Total revenue	$ 107,326	$ 95,893	$ 221,248	$ 183,398