SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014 segment	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments	2
Net revenues	$ 1,292,718	$ 1,340,028	$ 1,399,313
Income (loss) from operations	181,408	229,506	225,424
Accretion of discount to the relinquishment liability	(2,205)	(4,974)	(8,248)
Interest income	7,066	6,271	4,492
Interest expense, net of capitalized interest	(147,933)	(170,150)	(146,057)
Loss on early extinguishment of debt	(62,041)	(11,516)	(14,326)
Other expense, net	(853)	(1,595)	(44)
Net income (loss)	(24,558)	47,542	61,241
Loss attributable to non-controlling interests	380	2,784	2,019
Net income (loss) attributable to Mohegan Tribal Gaming Authority	(24,178)	50,326	63,260
Capital expenditures incurred	32,628	66,053	43,642
Total assets	2,055,960	2,136,150
Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues	995,100	1,042,078	1,084,017
Income (loss) from operations	181,325	212,680	199,358
Capital expenditures incurred	19,518	27,652	36,542
Total assets	1,368,352	1,425,152
Mohegan Sun at Pocono Downs
Segment Reporting Information [Line Items]
Net revenues	296,578	296,648	314,999
Income (loss) from operations	36,956	43,763	43,296
Capital expenditures incurred	3,946	4,673	3,543
Total assets	551,655	558,700
Corporate and other
Segment Reporting Information [Line Items]
Net revenues	5,391	1,302	297
Income (loss) from operations	(36,873)	(26,937)	(17,230)
Capital expenditures incurred	9,164	33,728	3,557
Total assets	135,953	152,298
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net revenues	$ (4,351)	$ 0	$ 0