SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Segment Reporting Information [Line Items]
Net revenues	$ 333,186	$ 316,732
Income (loss) from operations	70,076	49,773
Accretion of discount to the relinquishment liability	0	(227)
Interest income	2,130	1,834
Interest expense, net of capitalized interest	(34,147)	(36,255)
Loss on early extinguishment of debt	(207)	0
Other expense, net	(402)	(728)
Net income	37,450	14,397
(Income) loss attributable to non-controlling interests	(5,531)	369
Net income attributable to Mohegan Tribal Gaming Authority	31,919	14,766
Other comprehensive loss:
Foreign currency translation	(613)	0
Other comprehensive loss	(613)	0
Comprehensive income	31,306	14,766
Capital expenditures incurred	7,547	984
Total assets	2,178,798		$ 2,020,133
Mohegan Sun
Other comprehensive loss:
Capital expenditures incurred	6,086	352
Total assets	1,377,135		1,332,458
Mohegan Sun Pocono
Other comprehensive loss:
Capital expenditures incurred	1,374	613
Total assets	551,426		555,449
Corporate and other
Other comprehensive loss:
Capital expenditures incurred	87	19
Total assets	250,237		$ 132,226
Operating Segments | Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues	255,083	245,778
Income (loss) from operations	59,054	47,418
Operating Segments | Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Net revenues	73,024	70,396
Income (loss) from operations	9,006	8,479
Operating Segments | Corporate and other
Segment Reporting Information [Line Items]
Net revenues	6,352	1,831
Income (loss) from operations	2,016	(6,124)
Intersegment Elimination
Segment Reporting Information [Line Items]
Net revenues	$ (1,273)	$ (1,273)