RELATED PARTY TRANSACTIONS (Details)		3 Months Ended		9 Months Ended
	Feb. 28, 2015 a rooms	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Related Party Transaction [Line Items]
Distributions to Mohegan Tribe				$ 34,450,000	$ 32,500,000
Mohegan Tribe of Indians of Connecticut
Related Party Transaction [Line Items]
Distributions to Mohegan Tribe		$ 13,300,000	$ 12,500,000	34,500,000	32,500,000
Expenses for services provided to related party		7,000,000	7,200,000	21,800,000	21,400,000
Prepaid expenses to related party		7,100,000		7,100,000		$ 0
Incurred interest expense associated with a related party debt		364,000	529,000	1,500,000	1,600,000
Mohegan Tribal Utility Authority
Related Party Transaction [Line Items]
Utilities purchased from related party		$ 4,200,000	$ 3,900,000	$ 12,000,000	$ 13,300,000
Mohegan Tribal Finance Authority
Related Party Transaction [Line Items]
Fourth Amendment, Amount of acres released for use (in acres) | a	1.2
Fourth Amendment, Amount of rooms to be developed (in rooms) | rooms	400
Duration of the term of the Fourth Amendment	28 years 4 months