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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, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Earnings Per Share Disclosure [Line Items]        
Net income (loss) attributable to Korn/Ferry International $ 23,897 $ (15,995) $ 57,257 $ 25,058
Less: distributed and undistributed earnings to nonvested restricted stockholders 227 54 505 235
Basic net earnings (loss) attributable to common stockholders 23,670 (16,049) 56,752 24,823
Add: undistributed earnings to nonvested restricted stockholders 172   356 83
Less: reallocation of undistributed earnings to nonvested restricted stockholders 171   353 82
Diluted net earnings (loss) attributable to common stockholders $ 23,671 $ (16,049) $ 56,755 $ 24,824
Basic weighted-average number of common shares outstanding 56,173 54,003 56,325 51,159
Diluted weighted-average number of common shares outstanding 56,702 54,003 56,917 51,683
Basic earnings (loss) per share $ 0.42 $ (0.30) $ 1.01 $ 0.49
Diluted earnings (loss) per share $ 0.42 $ (0.30) $ 1.00 $ 0.48
ESPP        
Earnings Per Share Disclosure [Line Items]        
Stock 4   28 12
Restricted Stock        
Earnings Per Share Disclosure [Line Items]        
Stock 505   540 459
Stock Options        
Earnings Per Share Disclosure [Line Items]        
Stock 20   24 53