Segments - Financial Highlights (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 681,960,000	$ 712,447,000	$ 1,364,721,000	$ 1,418,709,000
Net income (loss) attributable to Korn Ferry	60,800,000	(1,711,000)	123,404,000	44,894,000
Net income attributable to noncontrolling interest	1,543,000	1,755,000	3,195,000	2,335,000
Other (income) loss, net	(5,391,000)	13,835,000	(19,896,000)	258,000
Interest expense, net	5,626,000	6,596,000	9,571,000	11,336,000
Income tax provision	24,898,000	2,341,000	47,252,000	20,761,000
Operating income	87,476,000	22,816,000	163,526,000	79,584,000
Depreciation and amortization	19,688,000	19,554,000	39,266,000	38,566,000
Other income (loss), net	5,391,000	(13,835,000)	19,896,000	(258,000)
Integration/acquisition costs	3,896,000	5,030,000	4,972,000	9,158,000
Impairment of fixed assets	0	1,452,000	0	1,575,000
Impairment of right-of-use assets	0	0	0	1,629,000
Restructuring charges, net	576,000	63,525,000	576,000	63,946,000
Adjusted EBITDA	117,027,000	98,542,000	228,236,000	194,200,000
Fee revenue
Segment Reporting Information [Line Items]
Total revenue	$ 674,365,000	$ 704,003,000	$ 1,349,311,000	$ 1,403,192,000