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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		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Earnings Per Share Disclosure [Line Items]
Net income attributable to Korn Ferry	$ 44,964	$ 27,247	$ 52,387	$ 92,619
Less: distributed and undistributed earnings to nonvested restricted stockholders	468	295	541	982
Basic net earnings attributable to common stockholders	44,496	26,952	51,846	91,637
Add: undistributed earnings to nonvested restricted stockholders	409	235	365	804
Less: reallocation of undistributed earnings to nonvested restricted stockholders	405	232	359	793
Diluted net earnings attributable to common stockholders	$ 44,500	$ 26,955	$ 51,852	$ 91,648
Basic weighted-average number of common shares outstanding	55,233	55,252	55,358	55,479
Diluted weighted-average number of common shares outstanding	55,753	55,997	56,181	56,236
Basic earnings per share	$ 0.81	$ 0.49	$ 0.94	$ 1.65
Diluted earnings per share	$ 0.80	$ 0.48	$ 0.92	$ 1.63
ESPP
Earnings Per Share Disclosure [Line Items]
Stock	4	4	24	7
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Stock	516	738	799	744
Stock Options
Earnings Per Share Disclosure [Line Items]
Stock		3		6

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