Annual report pursuant to Section 13 and 15(d)

Quarterly Results - Schedule of Unaudited Quarterly Information (Detail)

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Quarterly Results - Schedule of Unaudited Quarterly Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
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
Quarterly Financial Information [Line Items]                      
Fee Revenue                 $ 1,977,330 $ 1,973,862 $ 1,819,519
Operating income (loss) $ 22,227 $ 31,595 $ 61,869 $ 60,334 $ 62,275 $ 62,683 $ 70,987 $ (55,119) 176,025 140,826 208,446
Net income (621) 20,956 43,032 43,650 50,627 45,444 47,317 (38,592) 107,017 104,796 135,897
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
Earnings per common share attributable to Korn Ferry:                      
Basic $ (0.02) $ 0.37 $ 0.78 $ 0.77 $ 0.90 $ 0.81 $ 0.82 $ (0.70) $ 1.91 $ 1.84 $ 2.39
Diluted $ (0.02) $ 0.36 $ 0.77 $ 0.76 $ 0.89 $ 0.80 $ 0.81 $ (0.70) $ 1.90 $ 1.81 $ 2.35
Fee Revenue                      
Quarterly Financial Information [Line Items]                      
Fee Revenue $ 440,469 $ 515,325 $ 492,389 $ 484,549 $ 490,756 $ 474,504 $ 495,205 $ 465,568 $ 1,932,732 $ 1,926,033 $ 1,767,217