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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		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn Ferry	$ 42,804	$ 46,034	$ 85,755	$ 7,423
Less: distributed and undistributed earnings to nonvested restricted stockholders	466	485	910	118
Basic net earnings attributable to common stockholders	42,338	45,549	84,845	7,305
Add: undistributed earnings to nonvested restricted stockholders	406	425	792
Less: reallocation of undistributed earnings to nonvested restricted stockholders	405	419	788
Diluted net earnings attributable to common stockholders	$ 42,339	$ 45,555	$ 84,849	$ 7,305
Basic weighted-average number of common shares outstanding	54,568	55,461	54,917	55,420
Diluted weighted-average number of common shares outstanding	54,716	56,239	55,170	56,306
Basic earnings per share	$ 0.78	$ 0.82	$ 1.54	$ 0.13
Diluted earnings per share	$ 0.77	$ 0.81	$ 1.54	$ 0.13
ESPP
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities	10	11	25	14
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities	138	767	228	871
Stock Options
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities				1

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