SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Mar. 06, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011
Segment Reporting Information [Line Items]
Net revenues		$ 344,436	$ 361,379	$ 1,047,466	$ 1,044,928
Income (loss) from operations		50,836	60,097	167,336	161,409
Accretion of discount to the relinquishment liability		(2,062)	(2,842)	(6,186)	(8,525)
Interest income		1,842	665	3,559	2,063
Interest expense		(41,581)	(29,378)	(103,047)	(88,837)
Loss on early exchange of debt	14,300	(17)	0	(14,323)	0
Other expense, net		7	118	(31)	(226)
Net income (loss)		9,025	28,660	47,308	65,884
Loss attributable to non-controlling interests		336	486	1,147	1,400
Net income attributable to Mohegan Tribal Gaming Authority		9,361	29,146	48,455	67,284
Capital expenditures incurred				34,131	34,013
Total assets		2,226,723		2,226,723		2,203,196
Mohegan Sun [Member]
Segment Reporting Information [Line Items]
Net revenues		264,876	284,289	811,838	822,284
Income (loss) from operations		44,801	56,316	148,424	152,107
Capital expenditures incurred				29,967	29,889
Total assets		1,504,708		1,504,708		1,505,210
Mohegan Sun at Pocono Downs [Member]
Segment Reporting Information [Line Items]
Net revenues		79,560	77,090	235,628	222,644
Income (loss) from operations		10,716	7,677	31,660	21,590
Capital expenditures incurred				3,558	4,124
Total assets		576,612		576,612		584,267
Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations		(4,681)	(3,896)	(12,748)	(12,288)
Capital expenditures incurred				606	0
Total assets		$ 145,403		$ 145,403		$ 113,719