| Cover Page | Sep. 05, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Sep. 5, 2019 |
| Entity Registrant Name | Hamilton Lane Inc |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38021 |
| Entity Tax Identification Number | 26-2482738 |
| Entity Address, Address Line One | One Presidential Blvd., |
| Entity Address, Address Line Two | 4th Floor |
| Entity Address, City or Town | Bala Cynwyd, |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19004 |
| City Area Code | 610 |
| Local Phone Number | 934-2222 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, $0.001 par value per share |
| Trading Symbol | HLNE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001433642 |
| Amendment Flag | false |
| Pre-commencement Tender Offer | false |
