SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014 segment	Dec. 31, 2013	Sep. 30, 2014
Segment Reporting [Abstract]
Number of reportable segments	2
Segment Reporting Information [Line Items]
Net revenues	$ 316,732	$ 312,823
Income (loss) from operations	49,773	33,273
Accretion of discount to the relinquishment liability	(227)	(551)
Interest income	1,834	1,644
Interest expense, net of capitalized interest	(36,255)	(38,969)
Loss on early extinguishment of debt	0	(62,083)
Other expense, net	(728)	(704)
Net income (loss)	14,397	(67,390)
Loss attributable to non-controlling interests	369	136
Net income (loss) attributable to Mohegan Tribal Gaming Authority	14,766	(67,254)
Capital expenditures incurred	984	15,530
Total assets	2,067,748		2,055,960
Mohegan Sun
Segment Reporting Information [Line Items]
Net revenues	245,778	241,933
Income (loss) from operations	47,418	34,643
Capital expenditures incurred	352	5,039
Total assets	1,377,698		1,368,352
Mohegan Sun at Pocono Downs
Segment Reporting Information [Line Items]
Net revenues	70,396	70,683
Income (loss) from operations	8,479	7,577
Capital expenditures incurred	613	987
Total assets	554,080		551,655
Corporate and other
Segment Reporting Information [Line Items]
Net revenues	1,831	739
Income (loss) from operations	(6,124)	(8,947)
Capital expenditures incurred	19	9,504
Total assets	135,970		135,953
Intersegment Elimination
Segment Reporting Information [Line Items]
Net revenues	$ (1,273)	$ (532)