BASIS OF PRESENTATION - Severance Costs and Expenses (Details) (2012 Restructuring Plan, USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012 employee	Jun. 30, 2013	Jun. 30, 2013
Schedule of Accrued Severance Liability By Segment [Line Items]
Approximate workforce reductions (in positions)	330
Restructuring Reserve [Roll Forward]
Balance, beginning of period		$ 4,071	$ 12,521
Accrued severance at measurement date			124
Adjustments		51	(95)
Cash payments		(2,133)	(10,561)
Balance, end of period	12,521	1,989	1,989
Mohegan Sun
Restructuring Reserve [Roll Forward]
Balance, beginning of period		3,972	12,497
Accrued severance at measurement date			0
Adjustments		0	(146)
Cash payments		(1,993)	(10,372)
Balance, end of period		1,979	1,979
Corporate
Restructuring Reserve [Roll Forward]
Balance, beginning of period		0	24
Accrued severance at measurement date			0
Adjustments		0	0
Cash payments		0	(24)
Balance, end of period		0	0
Mohegan Sun at Pocono Downs
Restructuring Reserve [Roll Forward]
Balance, beginning of period		99	0
Accrued severance at measurement date			124
Adjustments		51	51
Cash payments		(140)	(165)
Balance, end of period		$ 10	$ 10