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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, 2017	Jul. 31, 2016
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn/Ferry International	$ 29,041	$ 3,208
Less: distributed and undistributed earnings to nonvested restricted stockholders	288	44
Basic net earnings attributable to common stockholders	28,753	3,164
Add: undistributed earnings to nonvested restricted stockholders	232
Less: reallocation of undistributed earnings to nonvested restricted stockholders	230
Diluted net earnings attributable to common stockholders	$ 28,755	$ 3,164
Basic weighted-average number of common shares outstanding	55,795	56,189
Diluted weighted-average number of common shares outstanding	56,403	56,576
Basic earnings per share	$ 0.52	$ 0.06
Diluted earnings per share	$ 0.51	$ 0.06
ESPP
Earnings Per Share Disclosure [Line Items]
Stock	8	11
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Stock	588	316
Stock Options
Earnings Per Share Disclosure [Line Items]
Stock	12	60

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