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Basic and Diluted Earnings (Loss) Per Share - Basic and Diluted Earnings (Loss) per Common Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Earnings Per Share Disclosure [Line Items]
Net income (loss) attributable to Korn Ferry	$ 42,951	$ (38,611)
Less: distributed and undistributed earnings to nonvested restricted stockholders	444	59
Basic net earnings (loss) attributable to common stockholders	42,507	(38,670)
Add: undistributed earnings to nonvested restricted stockholders	386
Less: reallocation of undistributed earnings to nonvested restricted stockholders	384
Diluted net earnings (loss) attributable to common stockholders	$ 42,509	$ (38,670)
Basic weighted-average number of common shares outstanding	55,266	55,378
Diluted weighted-average number of common shares outstanding	55,635	55,378
Basic earnings (loss) per share	$ 0.77	$ (0.70)
Diluted earnings (loss) per share	$ 0.76	$ (0.70)
ESPP
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities	12
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities	357

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