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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, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn Ferry	$ 19,993	$ 44,964	$ 105,748	$ 52,387
Less: distributed and undistributed earnings to nonvested restricted stockholders	222	468	1,138	541
Basic net earnings attributable to common stockholders	19,771	44,496	104,610	51,846
Add: undistributed earnings to nonvested restricted stockholders	161	409	960	365
Less: reallocation of undistributed earnings to nonvested restricted stockholders	160	405	953	359
Diluted net earnings attributable to common stockholders	$ 19,772	$ 44,500	$ 104,617	$ 51,852
Basic weighted-average number of common shares outstanding	53,999	55,233	54,611	55,358
Diluted weighted-average number of common shares outstanding	54,264	55,753	55,006	56,181
Basic earnings per share	$ 0.37	$ 0.81	$ 1.92	$ 0.94
Diluted earnings per share	$ 0.36	$ 0.80	$ 1.90	$ 0.92
ESPP
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities	7	4	32	24
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities	258	516	363	799

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