Document and Entity Information	9 Months Ended
	Jun. 30, 2020 shares
Cover [Abstract]
Entity Registrant Name	MOHEGAN TRIBAL GAMING AUTHORITY
Entity Central Index Key	0001005276
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Small Business	false
Entity Current Reporting Status	No
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	0
Entity Interactive Data Current	Yes
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 Address, Postal Zip Code	06382
City Area Code	860
Local Phone Number	862-8000
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	None
No Trading Symbol Flag	true
Security Exchange Name	NONE