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Basic and Diluted Earnings Per Share - Basic and Diluted Earnings per Common Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 30, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Korn Ferry | $ (802) | $ 19,993 | $ 42,804 | $ 42,951 | $ 50,264 | $ 44,964 | $ 46,034 | $ (38,611) | $ 104,946 | $ 102,651 | $ 133,779
Less: distributed and undistributed earnings to nonvested restricted stockholders |  |  |  |  |  |  |  |  | 1,140 | 1,066 | 1,426
Basic net earnings attributable to common stockholders |  |  |  |  |  |  |  |  | 103,806 | 101,585 | 132,353
Add: undistributed earnings to nonvested restricted stockholders |  |  |  |  |  |  |  |  | 901 | 831 | 1,187
Less: reallocation of undistributed earnings to nonvested restricted stockholders |  |  |  |  |  |  |  |  | 894 | 820 | 1,169
Diluted net earnings attributable to common stockholders |  |  |  |  |  |  |  |  | $ 103,813 | $ 101,596 | $ 132,371
Basic weighted-average number of common shares outstanding |  |  |  |  |  |  |  |  | 54,342 | 55,311 | 55,426
Diluted weighted-average number of common shares outstanding |  |  |  |  |  |  |  |  | 54,767 | 56,096 | 56,254
Basic earnings per share | $ (0.02) | $ 0.37 | $ 0.78 | $ 0.77 | $ 0.90 | $ 0.81 | $ 0.82 | $ (0.70) | $ 1.91 | $ 1.84 | $ 2.39
Diluted earnings per share | $ (0.02) | $ 0.36 | $ 0.77 | $ 0.76 | $ 0.89 | $ 0.80 | $ 0.81 | $ (0.70) | $ 1.90 | $ 1.81 | $ 2.35
ESPP |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  | 58 | 34 | 5
Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  | 367 | 750 | 822
Stock Options |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  | 1 | 1

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