Segments - Schedule of Financial Highlights By Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 2,761,086	$ 2,795,505	$ 2,863,836
Compensation and benefits	1,758,024	1,844,164	1,901,203
General and administrative expenses	258,488	259,039	268,458
Segment Adjusted EBITDA	463,866	408,204	457,277
Depreciation and amortization	80,287	77,966	68,335
Restructuring charges, net	1,892	68,558	42,573
Interest expense, net	20,363	20,968	25,864
Impairment of right-of-use assets	2,452	1,629	5,471
Impairment of fixed assets	509	1,575	4,375
Integration/acquisition costs	8,837	14,866	14,922
Management separation charges	4,614
Income tax provision	93,836	50,081	82,683
Net income attributable to noncontrolling interest	5,014	3,407	3,525
Net income attributable to Korn Ferry	246,062	169,154	209,529
Fee revenue
Segment Reporting Information [Line Items]
Total revenue	2,730,088	2,762,671	2,835,408
Cost of services	285,075	300,015	238,499
Operating Segments | Consulting
Segment Reporting Information [Line Items]
Total revenue	674,070	706,805	686,979
Compensation and benefits	453,964	484,468	478,549
General and administrative expenses	51,330	54,176	51,956
Cost of services	44,428	45,399	39,689
Other segment items	8,867	8,502	8,283
Segment Adjusted EBITDA	115,481	114,260	108,502
Depreciation and amortization	16,134	16,822	16,557
Restructuring charges, net	1,696	18,871	11,613
Operating Segments | Digital
Segment Reporting Information [Line Items]
Total revenue	363,727	366,924	354,967
Compensation and benefits	179,487	187,924	189,084
General and administrative expenses	38,762	38,452	37,413
Cost of services	33,927	33,290	31,522
Other segment items	(1,145)	(1,411)	(510)
Segment Adjusted EBITDA	112,696	108,669	97,458
Depreciation and amortization	34,954	32,248	29,997
Restructuring charges, net	0	9,469	2,856
Operating Segments | North America
Segment Reporting Information [Line Items]
Total revenue	542,068	513,545	568,212
Compensation and benefits	362,296	371,237	386,070
General and administrative expenses	33,324	31,588	32,437
Cost of services	3,825	3,419	3,370
Other segment items	(5,619)	(13,409)	5,485
Segment Adjusted EBITDA	148,242	120,710	140,850
Depreciation and amortization	1,416	1,774	2,013
Restructuring charges, net	0	8,825	4,515
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total revenue	195,268	185,552	188,114
Compensation and benefits	145,397	141,670	140,508
General and administrative expenses	17,034	16,351	14,667
Cost of services	287	513	731
Other segment items	861	1,116	828
Segment Adjusted EBITDA	31,689	25,902	31,380
Depreciation and amortization	1,935	1,726	1,369
Restructuring charges, net	196	17,265	12,732
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	87,840	86,273	95,956
Compensation and benefits	61,662	58,835	61,949
General and administrative expenses	7,838	8,831	9,697
Cost of services	318	184	138
Other segment items	(97)	(500)	(50)
Segment Adjusted EBITDA	18,119	18,923	24,222
Depreciation and amortization	910	904	661
Restructuring charges, net	0	1,963	2,129
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Total revenue	28,876	28,956	31,054
Compensation and benefits	18,175	18,664	20,379
General and administrative expenses	2,534	4,761	1,397
Cost of services	213	218	92
Other segment items	(195)	(258)	(184)
Segment Adjusted EBITDA	8,149	5,571	9,370
Depreciation and amortization	964	1,053	792
Restructuring charges, net	0	110	697
Operating Segments | Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	507,246	544,453	507,058
Compensation and benefits	186,184	210,356	214,949
General and administrative expenses	19,484	23,846	27,082
Cost of services	190,772	205,765	150,967
Other segment items	3,206	2,618	3,181
Segment Adjusted EBITDA	107,600	101,868	110,879
Depreciation and amortization	12,337	12,950	8,639
Restructuring charges, net	0	3,778	4,835
Operating Segments | RPO
Segment Reporting Information [Line Items]
Total revenue	361,991	362,997	431,496
Compensation and benefits	269,043	284,349	339,000
General and administrative expenses	21,154	18,612	21,220
Cost of services	11,305	11,227	11,990
Other segment items	7,854	8,410	6,698
Segment Adjusted EBITDA	52,635	40,399	52,588
Depreciation and amortization	3,317	2,863	2,410
Restructuring charges, net	0	7,885	3,097
Operating Segments | Fee revenue | Consulting
Segment Reporting Information [Line Items]
Total revenue	662,708	695,007	677,001
Operating Segments | Fee revenue | Digital
Segment Reporting Information [Line Items]
Total revenue	363,530	366,699	354,651
Operating Segments | Fee revenue | North America
Segment Reporting Information [Line Items]
Total revenue	535,921	506,927	562,139
Operating Segments | Fee revenue | EMEA
Segment Reporting Information [Line Items]
Total revenue	194,088	184,516	187,014
Operating Segments | Fee revenue | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	87,337	85,863	95,598
Operating Segments | Fee revenue | Latin America
Segment Reporting Information [Line Items]
Total revenue	28,862	28,937	31,047
Operating Segments | Fee revenue | Professional Search & Interim
Segment Reporting Information [Line Items]
Total revenue	503,515	540,615	503,395
Operating Segments | Fee revenue | RPO
Segment Reporting Information [Line Items]
Total revenue	354,127	354,107	424,563
Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0	0
Compensation and benefits	71,908	72,613	62,362
General and administrative expenses	60,524	58,400	56,174
Cost of services	0	0	0
Other segment items	(1,687)	(2,915)	(564)
Segment Adjusted EBITDA	(130,745)	(128,098)	(117,972)
Depreciation and amortization	8,320	7,626	5,897
Restructuring charges, net	0	392	99
Corporate | Fee revenue
Segment Reporting Information [Line Items]
Total revenue	$ 0	$ 0	$ 0