Basic and Diluted Earnings Per Share - Basic and Diluted Earnings per Common Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn Ferry	$ 59,071	$ 11,247	$ 103,965	$ 162,035
Less: distributed and undistributed earnings to nonvested restricted stockholders	1,014	249	1,954	3,545
Basic net earnings attributable to common stockholders	58,057	10,998	102,011	158,490
Add: undistributed earnings to nonvested restricted stockholders	717	72	1,273	3,017
Less: reallocation of undistributed earnings to nonvested restricted stockholders	714	72	1,268	2,997
Diluted net earnings attributable to common stockholders	$ 58,060	$ 10,998	$ 102,016	$ 158,510
Weighted-average common shares outstanding:
Basic weighted-average number of common shares outstanding (in shares)	51,126	51,278	51,129	51,639
Diluted weighted-average number of common shares outstanding (in shares)	51,343	51,431	51,329	51,999
Net earnings per common share:
Basic earnings per share (in usd per share)	$ 1.14	$ 0.21	$ 2.00	$ 3.07
Diluted earnings per share (in usd per share)	$ 1.13	$ 0.21	$ 1.99	$ 3.05
ESPP
Weighted-average common shares outstanding:
Effect of dilutive securities (in shares)	1	3	7	8
Restricted Stock Awards
Weighted-average common shares outstanding:
Effect of dilutive securities (in shares)	216	150	193	352