Segments - Financial Highlights by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Jan. 31, 2022		Jan. 31, 2021		Jan. 31, 2022		Jan. 31, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 684,956		$ 477,880		$ 1,916,452		$ 1,262,552
Net income attributable to Korn Ferry	84,101		51,319		234,696		48,264
Net income (loss) attributable to noncontrolling interest	956		269		3,090		547
Other (income) loss, net	7,277		(14,935)		(2,236)		(26,374)
Interest expense, net	7,029		7,298		18,820		21,686
Income tax provision	26,927		21,204		76,951		25,409
Operating income	126,290		65,155		331,321		69,532
Depreciation and amortization	16,104		15,735		47,381		46,068
Other income (loss), net	(7,277)		14,935		2,236		26,374
Integration/acquisition costs	3,214				4,298		737
Impairment of fixed assets					1,915
Impairment of right of use assets					7,392
Restructuring charges, net			838				30,732
Adjusted EBITDA	138,331	[1]	96,663	[2]	394,543	[3]	173,443	[4]
Fee Revenue
Segment Reporting Information [Line Items]
Total revenue	680,741		475,360		1,905,579		1,254,896
Operating Segments | Consulting
Segment Reporting Information [Line Items]
Total revenue	163,824		136,593		478,563		363,234
Adjusted EBITDA	28,556	[1]	27,515	[2]	85,458	[3]	54,282	[4]
Operating Segments | Digital
Segment Reporting Information [Line Items]
Total revenue	90,501		75,967		259,894		207,027
Adjusted EBITDA	28,142	[1]	27,134	[2]	82,330	[3]	58,161	[4]
Operating Segments | Executive Search
Segment Reporting Information [Line Items]
Total revenue	240,038		168,489		694,184		437,974
Adjusted EBITDA	65,717	[1]	41,692	[2]	193,443	[3]	77,974	[4]
Operating Segments | Executive Search | North America
Segment Reporting Information [Line Items]
Total revenue	153,454		106,325		451,836		267,790
Adjusted EBITDA	45,702	[1]	30,941	[2]	137,939	[3]	57,439	[4]
Operating Segments | Executive Search | EMEA
Segment Reporting Information [Line Items]
Total revenue	47,666		36,016		133,080		97,925
Adjusted EBITDA	8,080	[1]	3,918	[2]	23,328	[3]	8,445	[4]
Operating Segments | Executive Search | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	31,448		21,680		88,447		59,840
Adjusted EBITDA	9,451	[1]	6,375	[2]	25,972	[3]	11,610	[4]
Operating Segments | Executive Search | Latin America
Segment Reporting Information [Line Items]
Total revenue	7,470		4,468		20,821		12,419
Adjusted EBITDA	2,484	[1]	458	[2]	6,204	[3]	480	[4]
Operating Segments | RPO & Professional Search
Segment Reporting Information [Line Items]
Total revenue	190,593		96,831		483,811		254,317
Adjusted EBITDA	44,109	[1]	19,630	[2]	114,334	[3]	39,453	[4]
Operating Segments | Fee Revenue | Consulting
Segment Reporting Information [Line Items]
Total revenue	162,889		136,268		476,260		362,271
Operating Segments | Fee Revenue | Digital
Segment Reporting Information [Line Items]
Total revenue	90,194		75,791		259,504		206,807
Operating Segments | Fee Revenue | Executive Search
Segment Reporting Information [Line Items]
Total revenue	238,999		168,104		691,362		436,307
Operating Segments | Fee Revenue | Executive Search | North America
Segment Reporting Information [Line Items]
Total revenue	152,597		106,002		449,472		266,485
Operating Segments | Fee Revenue | Executive Search | EMEA
Segment Reporting Information [Line Items]
Total revenue	47,509		35,991		132,690		97,701
Operating Segments | Fee Revenue | Executive Search | Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	31,425		21,643		88,385		59,702
Operating Segments | Fee Revenue | Executive Search | Latin America
Segment Reporting Information [Line Items]
Total revenue	7,468		4,468		20,815		12,419
Operating Segments | Fee Revenue | RPO & Professional Search
Segment Reporting Information [Line Items]
Total revenue	188,659		95,197		478,453		249,511
Corporate
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (28,193)	[1]	$ (19,308)	[2]	$ (81,022)	[3]	$ (56,427)	[4]

[1] Adjusted EBITDA refers to earnings before interest, taxes, depreciation and amortization and further excludes integration/acquisition costs

[2] Adjusted EBITDA refers to earnings before interest, taxes, depreciation and amortization and further excludes net restructuring charges

[3] Adjusted EBITDA refers to earnings before interest, taxes, depreciation and amortization and further excludes integration/acquisition costs and impairment charges

[4] Adjusted EBITDA refers to earnings before interest, taxes, depreciation and amortization and further excludes integration/acquisition costs and net restructuring charges