Segments - Schedule of Financial Highlights By Reportable Segments (Details) $ in Thousands	3 Months Ended
	Jul. 31, 2025 USD ($) segment	Jul. 31, 2024 USD ($)
Segment Reporting [Abstract]
Number of business segments | segment	8
Segment Reporting Information [Line Items]
Total revenue	$ 715,543	$ 682,761
Compensation and benefits	461,411	451,775
General and administrative expenses	63,874	59,999
Segment Adjusted EBITDA	120,394	111,209
Depreciation and amortization	22,686	19,578
Interest expense, net	3,516	3,945
Integration/acquisition costs	1,508	1,076
Income tax provision	25,250	22,354
Net income attributable to noncontrolling interest	798	1,652
Net income attributable to Korn Ferry	66,636	62,604
Fee revenue
Segment Reporting Information [Line Items]
Total revenue	708,613	674,946
Cost of services	77,194	67,544
Operating Segments | Consulting
Segment Reporting Information [Line Items]
Total revenue	172,699	170,767
Compensation and benefits	117,189	114,664
General and administrative expenses	12,982	12,860
Cost of services	12,407	12,517
Other segment items	1,312	1,432
Segment Adjusted EBITDA	28,809	29,294
Depreciation and amortization	3,645	4,216
Operating Segments | Digital
Segment Reporting Information [Line Items]
Total revenue	89,245	88,211
Compensation and benefits	44,505	45,274
General and administrative expenses	9,974	9,135
Cost of services	7,873	7,908
Other segment items	(714)	(729)
Segment Adjusted EBITDA	27,607	26,623
Depreciation and amortization	11,588	8,100
Operating Segments | North America
Segment Reporting Information [Line Items]
Total revenue	141,215	136,087
Compensation and benefits	99,489	101,191
General and administrative expenses	6,950	7,646
Cost of services	860	1,059
Other segment items	(7,324)	(8,907)
Segment Adjusted EBITDA	41,240	35,098
Depreciation and amortization	365	415
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total revenue	54,081	46,276
Compensation and benefits	40,186	34,586
General and administrative expenses	4,420	4,111
Cost of services	129	100
Other segment items	203	214
Segment Adjusted EBITDA	9,143	7,265
Depreciation and amortization	556	493
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	24,839	20,704
Compensation and benefits	17,111	14,392
General and administrative expenses	2,096	2,158
Cost of services	167	154
Other segment items	(70)	(218)
Segment Adjusted EBITDA	5,535	4,218
Depreciation and amortization	241	216
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Total revenue	6,139	7,326
Compensation and benefits	3,731	4,416
General and administrative expenses	932	163
Cost of services	60	54
Other segment items	(124)	(105)
Segment Adjusted EBITDA	1,540	2,798
Depreciation and amortization	267	256
Operating Segments | Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	135,141	122,730
Compensation and benefits	48,583	48,136
General and administrative expenses	5,126	5,213
Cost of services	52,497	43,055
Other segment items	908	620
Segment Adjusted EBITDA	28,027	25,706
Depreciation and amortization	2,975	3,053
Operating Segments | RPO
Segment Reporting Information [Line Items]
Total revenue	92,184	90,660
Compensation and benefits	69,343	68,648
General and administrative expenses	4,447	4,665
Cost of services	3,201	2,697
Other segment items	851	2,156
Segment Adjusted EBITDA	14,342	12,494
Depreciation and amortization	964	777
Operating Segments | Fee revenue | Consulting
Segment Reporting Information [Line Items]
Total revenue	169,962	167,870
Operating Segments | Fee revenue | Digital
Segment Reporting Information [Line Items]
Total revenue	89,198	88,180
Operating Segments | Fee revenue | North America
Segment Reporting Information [Line Items]
Total revenue	139,654	134,752
Operating Segments | Fee revenue | EMEA
Segment Reporting Information [Line Items]
Total revenue	53,781	45,981
Operating Segments | Fee revenue | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	24,701	20,579
Operating Segments | Fee revenue | Latin America
Segment Reporting Information [Line Items]
Total revenue	6,117	7,323
Operating Segments | Fee revenue | Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	133,901	121,741
Operating Segments | Fee revenue | RPO
Segment Reporting Information [Line Items]
Total revenue	91,299	88,520
Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0
Compensation and benefits	19,766	19,392
General and administrative expenses	16,947	14,048
Cost of services	0	0
Other segment items	(864)	(1,153)
Segment Adjusted EBITDA	(35,849)	(32,287)
Depreciation and amortization	2,085	2,052
Corporate | Fee revenue
Segment Reporting Information [Line Items]
Total revenue	$ 0	$ 0