SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)	Sep. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Net revenues	$ 325,039	$ 326,336	$ 952,194	$ 955,842
Income (loss) from operations	61,499	48,982	160,279	127,338
Accretion of discount to the relinquishment liability	0	(552)	(227)	(1,654)
Interest income	1,906	1,701	5,554	4,947
Interest expense, net of capitalized interest	(35,660)	(36,426)	(107,692)	(111,692)
Loss on early extinguishment of debt	0	(2)	0	(62,277)
Other income (expense), net	(50)	59	(1,260)	(819)
Net income (loss)	27,695	13,762	56,654	(44,157)
Loss attributable to non-controlling interests	439	130	1,278	421
Net income (loss) attributable to Mohegan Tribal Gaming Authority	28,134	13,892	57,932	(43,736)
Capital expenditures incurred			9,038	26,984
Total assets	2,031,346		2,031,346		$ 2,055,960
Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues	246,840	248,866	732,903	734,277
Income (loss) from operations	54,557	47,088	148,573	127,459
Capital expenditures incurred			6,899	15,204
Total assets	1,336,702		1,336,702		1,368,352
Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Net revenues	77,932	77,194	218,456	220,863
Income (loss) from operations	12,842	9,936	31,423	26,555
Capital expenditures incurred			2,087	2,808
Total assets	554,329		554,329		551,655
Corporate and other
Segment Reporting Information [Line Items]
Net revenues	1,540	1,549	4,654	3,780
Income (loss) from operations	(5,900)	(8,042)	(19,717)	(26,676)
Capital expenditures incurred			52	8,972
Total assets	140,315		140,315		$ 135,953
Intersegment Elimination
Segment Reporting Information [Line Items]
Net revenues	$ (1,273)	$ (1,273)	$ (3,819)	$ (3,078)