SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Net revenues	$ 323,427	$ 325,039	$ 988,402	$ 952,194
Income (loss) from operations	57,997	61,499	188,331	160,279
Accretion of discount to the relinquishment liability	0	0	0	(227)
Interest income	2,284	1,906	6,469	5,554
Interest expense	(33,949)	(35,660)	(102,294)	(107,692)
Loss on modification and early extinguishment of debt	(277)	0	(484)	0
Other expense, net	(495)	(50)	(1,355)	(1,260)
Net income	25,560	27,695	90,667	56,654
(Income) loss attributable to non-controlling interests	478	439	(2,225)	1,278
Net income attributable to Mohegan Tribal Gaming Authority	26,038	28,134	88,442	57,932
Comprehensive income:
Foreign currency translation	(606)	0	3,596	0
Other comprehensive income (loss)	(606)	0	3,596	0
Other comprehensive (income) loss attributable to non-controlling interests	384	0	(1,793)	0
Other comprehensive income (loss) attributable to Mohegan Tribal Gaming Authority	(222)	0	1,803	0
Comprehensive income attributable to Mohegan Tribal Gaming Authority	25,816	28,134	90,245	57,932
Capital expenditures incurred			27,695	9,038
Total assets	2,169,385		2,169,385		$ 2,020,133
Mohegan Sun
Comprehensive income:
Capital expenditures incurred			23,666	6,899
Total assets	1,342,583		1,342,583		1,332,458
Mohegan Sun Pocono
Comprehensive income:
Capital expenditures incurred			3,914	2,087
Total assets	547,306		547,306		555,449
Corporate and other
Comprehensive income:
Capital expenditures incurred			115	52
Total assets	279,496		279,496		$ 132,226
Operating Segments | Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues	244,123	246,840	755,392	732,903
Income (loss) from operations	50,520	54,557	171,251	148,573
Operating Segments | Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Net revenues	76,450	77,932	223,160	218,456
Income (loss) from operations	11,172	12,842	30,910	31,423
Operating Segments | Corporate and other
Segment Reporting Information [Line Items]
Net revenues	4,127	1,540	13,669	4,654
Income (loss) from operations	(3,695)	(5,900)	(13,830)	(19,717)
Intersegment Elimination
Segment Reporting Information [Line Items]
Net revenues	$ (1,273)	$ (1,273)	$ (3,819)	$ (3,819)