DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019
Document and Entity Information [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
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding	0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes
Entity Public Float		$ 0