SEGMENT REPORTING (Details) $ in Thousands		3 Months Ended
	Oct. 14, 2016 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment		2
Segment Reporting Information [Line Items]
Net revenues		$ 330,992	$ 333,186
Income (loss) from operations		49,420	70,076
Interest income		2,900	2,130
Interest expense		(30,035)	(34,147)
Loss on modification and early extinguishment of debt	$ (58,900)	(73,796)	(207)
Loss from unconsolidated affiliates		(731)	(393)
Other income (expense), net		1	(9)
Net income (loss)		(52,241)	37,450
(Income) loss attributable to non-controlling interests		619	(5,531)
Net income (loss) attributable to Mohegan Tribal Gaming Authority		(51,622)	31,919
Comprehensive income (loss):
Foreign currency translation		(18,310)	(613)
Other comprehensive loss		(18,310)	(613)
Other comprehensive loss attributable to non-controlling interests		9,413	0
Other comprehensive loss attributable to Mohegan Tribal Gaming Authority		(8,897)	(613)
Comprehensive income (loss) attributable to Mohegan Tribal Gaming Authority		(60,519)	31,306
Capital expenditures incurred		10,647	7,547
Total assets		2,231,287		$ 2,227,962
Mohegan Sun
Comprehensive income (loss):
Capital expenditures incurred		6,894	6,086
Total assets		1,347,381		1,332,231
Mohegan Sun Pocono
Comprehensive income (loss):
Capital expenditures incurred		1,255	1,374
Total assets		585,162		551,116
Corporate and other
Comprehensive income (loss):
Capital expenditures incurred		2,498	87
Total assets		298,744		$ 344,615
Operating segments | Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues		259,203	255,083
Income (loss) from operations		49,349	59,054
Operating segments | Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Net revenues		68,418	73,024
Income (loss) from operations		7,910	9,006
Operating segments | Corporate and other
Segment Reporting Information [Line Items]
Net revenues		3,431	6,352
Income (loss) from operations		(7,839)	2,016
Inter-segment revenues
Segment Reporting Information [Line Items]
Net revenues		$ (60)	$ (1,273)