| Cover Page Document | Oct. 24, 2019 |
| Cover page [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 24, 2019 |
| Entity Registrant Name | Houlihan Lokey, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37537 |
| Entity Tax Identification Number | 95-2770395 |
| Entity Address, Address Line One | 10250 Constellation Blvd. |
| Entity Address, Address Line Two | 5th Floor |
| 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 | 788-5200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, par value $0.001 |
| Trading Symbol | HLI |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001302215 |
| Amendment Flag | false |
