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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 6 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Earnings Per Share Disclosure [Line Items]        
Net income attributable to Korn/Ferry International $ 30,152 $ 17,971 $ 33,360 $ 41,053
Less: distributed and undistributed earnings to nonvested restricted stockholders 270 167 283 390
Basic net earnings attributable to common stockholders 29,882 17,804 33,077 40,663
Add: undistributed earnings to nonvested restricted stockholders 220 118 188 292
Less: reallocation of undistributed earnings to nonvested restricted stockholders 218 117 186 289
Diluted net earnings attributable to common stockholders $ 29,884 $ 17,805 $ 33,079 $ 40,666
Basic weighted-average number of common shares outstanding 56,614 49,981 56,401 49,737
Diluted weighted-average number of common shares outstanding 56,983 50,362 56,863 50,233
Basic earnings per share $ 0.53 $ 0.36 $ 0.59 $ 0.82
Diluted earnings per share $ 0.52 $ 0.35 $ 0.58 $ 0.81
ESPP        
Earnings Per Share Disclosure [Line Items]        
Stock 16 2 27 5
Restricted Stock        
Earnings Per Share Disclosure [Line Items]        
Stock 335 330 409 433
Stock Options        
Earnings Per Share Disclosure [Line Items]        
Stock 18 49 26 58