SEGMENT REPORTING (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 14, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment				2
Segment Reporting Information [Line Items]
Net revenues		$ 336,824	$ 331,789	$ 667,816	$ 664,975
Income (loss) from operations		59,424	60,258	108,844	130,334
Interest income		2,678	2,055	5,578	4,185
Interest expense		(28,594)	(34,198)	(58,629)	(68,345)
Loss on modification and early extinguishment of debt	$ (58,900)	0	0	(73,796)	(207)
Loss from unconsolidated affiliates		(2,114)	(451)	(2,845)	(844)
Other income (expense), net		2	(7)	3	(16)
Net income (loss)		31,396	27,657	(20,845)	65,107
(Income) loss attributable to non-controlling interests		74	2,828	693	(2,703)
Net income (loss) attributable to Mohegan Tribal Gaming Authority		31,470	30,485	(20,152)	62,404
Comprehensive income (loss):
Foreign currency translation		15,009	4,815	(3,301)	4,202
Other comprehensive income (loss)		15,009	4,815	(3,301)	4,202
Other comprehensive (income) loss attributable to non-controlling interests		(7,804)	(2,177)	1,609	(2,177)
Other comprehensive income (loss) attributable to Mohegan Tribal Gaming Authority		7,205	2,638	(1,692)	2,025
Comprehensive income (loss) attributable to Mohegan Tribal Gaming Authority		38,675	33,123	(21,844)	64,429
Capital expenditures incurred				29,325	20,139
Total assets		2,203,874		2,203,874		$ 2,227,962
Mohegan Sun
Segment Reporting Information [Line Items]
Income (loss) from operations		66,485	61,677	115,834	120,731
Comprehensive income (loss):
Capital expenditures incurred				19,843	17,988
Total assets		1,323,398		1,323,398		1,332,231
Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Income (loss) from operations		9,691	10,732	17,601	19,738
Comprehensive income (loss):
Capital expenditures incurred				2,875	2,048
Total assets		583,427		583,427		551,116
Corporate and other
Segment Reporting Information [Line Items]
Income (loss) from operations		(16,752)	(12,151)	(24,591)	(10,135)
Comprehensive income (loss):
Capital expenditures incurred				6,607	103
Total assets		297,049		297,049		$ 344,615
Operating segments | Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues		264,994	256,186	524,197	511,269
Operating segments | Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Net revenues		68,303	73,686	136,721	146,710
Operating segments | Corporate and other
Segment Reporting Information [Line Items]
Net revenues		3,587	3,190	7,018	9,542
Inter-segment revenues
Segment Reporting Information [Line Items]
Net revenues		$ (60)	$ (1,273)	$ (120)	$ (2,546)