Basic and Diluted Earnings Per Share - Schedule of Basic and Diluted Earnings per Common Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn Ferry	$ 58,414	$ 59,071	$ 181,818	$ 103,965
Less: distributed and undistributed earnings to nonvested restricted stockholders	721	1,014	2,488	1,954
Basic net earnings attributable to common stockholders	57,693	58,057	179,330	102,011
Add: undistributed earnings to nonvested restricted stockholders	483	717	1,654	1,273
Less: reallocation of undistributed earnings to nonvested restricted stockholders	476	714	1,625	1,268
Diluted net earnings attributable to common stockholders	$ 57,700	$ 58,060	$ 179,359	$ 102,016
Weighted-average common shares outstanding:
Basic weighted-average number of common shares outstanding (in shares)	51,606	51,126	51,838	51,129
Diluted weighted-average number of common shares outstanding (in shares)	52,364	51,343	52,789	51,329
Net earnings per common share:
Basic earnings (loss) per share (in usd per share)	$ 1.12	$ 1.14	$ 3.46	$ 2.00
Diluted earnings (loss) per share (in usd per share)	$ 1.10	$ 1.13	$ 3.40	$ 1.99
ESPP
Weighted-average common shares outstanding:
Effect of dilutive securities (in shares)	3	1	4	7
Restricted Stock Awards
Weighted-average common shares outstanding:
Effect of dilutive securities (in shares)	755	216	947	193