SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015 segment	Mar. 31, 2014	Sep. 30, 2014
Segment Reporting [Abstract]
Number of reportable segments			2
Segment Reporting Information [Line Items]
Net revenues	$ 310,423	$ 316,683	$ 627,155	$ 629,506
Income (loss) from operations	49,007	45,083	98,780	78,356
Accretion of discount to the relinquishment liability	0	(551)	(227)	(1,102)
Interest income	1,814	1,602	3,648	3,246
Interest expense, net of capitalized interest	(35,777)	(36,297)	(72,032)	(75,266)
Loss on early extinguishment of debt	0	(192)	0	(62,275)
Other expense, net	(482)	(174)	(1,210)	(878)
Net income (loss)	14,562	9,471	28,959	(57,919)
Loss attributable to non-controlling interests	470	155	839	291
Net income (loss) attributable to Mohegan Tribal Gaming Authority	15,032	9,626	29,798	(57,628)
Capital expenditures incurred			2,804	19,161
Total assets	2,031,566		2,031,566		2,055,960
Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues	240,285	243,478	486,063	485,411
Income (loss) from operations	46,598	45,728	94,016	80,371
Capital expenditures incurred			1,830	8,218
Total assets	1,345,348		1,345,348		1,368,352
Mohegan Sun Pocono
Segment Reporting Information [Line Items]
Net revenues	70,128	72,986	140,524	143,669
Income (loss) from operations	10,102	9,042	18,581	16,619
Capital expenditures incurred			901	1,994
Total assets	550,908		550,908		551,655
Corporate and other
Segment Reporting Information [Line Items]
Net revenues	1,283	1,492	3,114	2,231
Income (loss) from operations	(7,693)	(9,687)	(13,817)	(18,634)
Capital expenditures incurred			73	8,949
Total assets	135,310		135,310		135,953
Intersegment Elimination
Segment Reporting Information [Line Items]
Net revenues	$ (1,273)	$ (1,273)	$ (2,546)	$ (1,805)