| Document and Entity Information | Mar. 17, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001005276 |
| Document Type | 8-K |
| Document Period End Date | Mar. 17, 2021 |
| Entity Registrant Name | MOHEGAN TRIBAL GAMING AUTHORITY |
| Entity File Number | 033-80655 |
| Entity Tax Identification Number | 06-1436334 |
| Entity Address, Address Line One | One Mohegan Sun Boulevard |
| Entity Address, City or Town | Uncasville |
| Entity Address, State or Province | CT |
| Entity Incorporation State Country Code | CT |
| Entity Address, Postal Zip Code | 06382 |
| City Area Code | (860) |
| Local Phone Number | 862-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
