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Basic and Diluted Earnings per Common Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn/Ferry International	$ 3,208	$ 23,082
Less: distributed and undistributed earnings to nonvested restricted stockholders	44	224
Basic net earnings attributable to common stockholders	3,164	22,858
Add: undistributed earnings to nonvested restricted stockholders		176
Less: reallocation of undistributed earnings to nonvested restricted stockholders		174
Diluted net earnings attributable to common stockholders	$ 3,164	$ 22,860
Basic weighted-average number of common shares outstanding	56,189	49,493
Diluted weighted-average number of common shares outstanding	56,576	50,014
Basic earnings per share	$ 0.06	$ 0.46
Diluted earnings per share	$ 0.06	$ 0.46
ESPP
Earnings Per Share Disclosure [Line Items]
Stock	11	3
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Stock	316	452
Stock Options
Earnings Per Share Disclosure [Line Items]
Stock	60	66

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