LEASES (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Dec. 15, 2017	Mar. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Minimum future rental income
2018			$ 6,084
2019			5,546
2020			5,410
2021			5,025
2022			2,220
Thereafter			5,914
Total			30,199
Related Party Transaction [Line Items]
Rental expense			9,500	$ 8,800	$ 9,200
Minimum future rental payments - leases
2018			1,873
2019			1,481
2020			1,241
2021			83
2022			4
Thereafter			1
Total			4,683
Mohegan Tribal Finance Authority
Related Party Transaction [Line Items]
Initial lease term		28 years 4 months
Subleases
Related Party Transaction [Line Items]
Rental expense			8,800
Minimum future rental payments - leases
2018			6,975
2019			6,991
2020			7,112
2021			7,234
2022			7,359
Thereafter			204,152
Total			239,823
Subleases | Mohegan Tribal Finance Authority
Related Party Transaction [Line Items]
Rental expense			$ 8,800
Subsequent Event | Connector
Related Party Transaction [Line Items]
Purchase price of the connector	$ 8,500