Cover	6 Months Ended
	Mar. 31, 2021 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	033-80655
Entity Registrant Name	MOHEGAN TRIBAL GAMING AUTHORITY
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 Address, Postal Zip Code	06382
City Area Code	860
Local Phone Number	862-8000
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001005276
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding	0