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, 2023	Apr. 30, 2022	Apr. 30, 2021
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn Ferry	$ 209,529	$ 326,360	$ 114,454
Less: distributed and undistributed earnings to nonvested restricted stockholders	4,618	7,343	2,763
Basic net earnings attributable to common stockholders	204,911	319,017	111,691
Add: undistributed earnings to nonvested restricted stockholders	3,912	6,750	2,185
Less: reallocation of undistributed earnings to nonvested restricted stockholders	3,882	6,676	2,165
Diluted net earnings attributable to common stockholders	$ 204,941	$ 319,091	$ 111,711
Weighted-average common shares outstanding:
Basic weighted-average number of common shares outstanding (in shares)	51,482	52,807	52,928
Diluted weighted-average number of common shares outstanding (in shares)	51,883	53,401	53,405
Net earnings per common share:
Basic earnings per share (in dollars per share)	$ 3.98	$ 6.04	$ 2.11
Diluted (in dollars per share)	$ 3.95	$ 5.98	$ 2.09
ESPP
Weighted-average common shares outstanding:
Effect of dilutive securities (in shares)	17	14	1
Restricted stock
Weighted-average common shares outstanding:
Effect of dilutive securities (in shares)	384	580	476