| Document and Entity Information | Oct. 03, 2019 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0000056679 |
| Document Type | 8-K |
| Document Period End Date | Oct. 3, 2019 |
| Entity Registrant Name | KORN FERRY |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-14505 |
| Entity Tax Identification Number | 95-2623879 |
| Entity Address, Address Line One | 1900 Avenue of the Stars |
| Entity Address, Address Line Two | Suite 2600 |
| Entity Address, City or Town | Los Angeles |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90067 |
| City Area Code | (310) |
| Local Phone Number | 552-1834 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | KFY |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
