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	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn Ferry	$ 169,154	$ 209,529	$ 326,360
Less: distributed and undistributed earnings to nonvested restricted stockholders	3,092	4,618	7,343
Basic net earnings attributable to common stockholders	166,062	204,911	319,017
Add: undistributed earnings to nonvested restricted stockholders	2,122	3,912	6,750
Less: reallocation of undistributed earnings to nonvested restricted stockholders	2,106	3,882	6,676
Diluted net earnings attributable to common stockholders	$ 166,078	$ 204,941	$ 319,091
Weighted-average common shares outstanding:
Basic weighted-average number of common shares outstanding (in shares)	51,038	51,482	52,807
Diluted weighted-average number of common shares outstanding (in shares)	51,432	51,883	53,401
Net earnings per common share:
Basic earnings per share (in dollars per share)	$ 3.25	$ 3.98	$ 6.04
Diluted earnings per share (in dollars per share)	$ 3.23	$ 3.95	$ 5.98
ESPP
Weighted-average common shares outstanding:
Effect of dilutive securities (in shares)	6	17	14
Restricted stock
Weighted-average common shares outstanding:
Effect of dilutive securities (in shares)	388	384	580