LONG-TERM DEBT - Credit Facilities (Details) (USD $)			0 Months Ended	9 Months Ended		9 Months Ended															3 Months Ended
	Jun. 30, 2012	Sep. 30, 2011	Mar. 06, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member]	Sep. 30, 2011 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member] Minimum [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member] Maximum [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member] Base Rate Revolving Loans [Member] Minimum [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member] Base Rate Revolving Loans [Member] Maximum [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member] Eurodollar Rate Revolving Loans [Member] Minimum [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member] Eurodollar Rate Revolving Loans [Member] Maximum [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member] Base Rate Term Loans [Member]	Jun. 30, 2012 Credit Facility [Member] Bank Credit Facility, due March 2015 [Member] Eurodollar Rate Term Loans [Member]	Jun. 30, 2012 Credit Facility [Member] Term Loan Facility, due March 2016, net of discount of $4,440 [Member]	Mar. 06, 2012 Credit Facility [Member] Term Loan Facility, due March 2016, net of discount of $4,440 [Member]	Sep. 30, 2011 Credit Facility [Member] Term Loan Facility, due March 2016, net of discount of $4,440 [Member]	Jun. 30, 2012 Credit Facility [Member] Term Loan Facility, due March 2016, net of discount of $4,440 [Member] Base Rate Term Loans [Member]	Jun. 30, 2012 Credit Facility [Member] Term Loan Facility, due March 2016, net of discount of $4,440 [Member] Eurodollar Rate Term Loans [Member]	Jun. 30, 2012 Credit Facility [Member] Bank of America, N.A. Line of Credit [Member]	Sep. 30, 2011 Credit Facility [Member] Bank of America, N.A. Line of Credit [Member]	Dec. 31, 2012 Credit Facility [Member] Mohegan Tribe Credit Facility [Member]	Jun. 30, 2012 Credit Facility [Member] Mohegan Tribe Credit Facility [Member]	Mar. 31, 2012 Credit Facility [Member] Mohegan Tribe Credit Facility [Member]	Sep. 30, 2011 Credit Facility [Member] Mohegan Tribe Credit Facility [Member]	Jun. 30, 2012 Credit Facility [Member] Salishan-Mohegan Bank Credit Facility [Member]	Sep. 30, 2011 Credit Facility [Member] Salishan-Mohegan Bank Credit Facility [Member]	Jun. 30, 2012 Credit Facility [Member] Letter of Credit [Member] Bank Credit Facility, due March 2015 [Member]	Mar. 06, 2012 Credit Facility [Member] Letter of Credit [Member] Bank Credit Facility, due March 2015 [Member]
Debt Instrument [Line Items]
Borrowing capacity																			$ 16,500,000				$ 1,450,000	$ 1,750,000				$ 75,000,000
Loan face amount															225,000,000
Repayment rate, quarterly			1,000,000
Debt outstanding	1,652,996,000	1,629,775,000		398,000,000	535,000,000									220,782,000		0						1,450,000		850,000	0	15,250,000
Letters of credit issued																											2,300,000
Credit facility outstanding			400,000,000
Credit facility remaining borrowing capacity				72,700,000
Basis spread on variable rate				4.50%				2.25%	3.25%	3.50%	4.50%	3.25%	4.50%	7.50%			6.50%	7.50%
Variable rate basis floor													1.00%					1.50%
Fee assessed on unused revolving credit				0.50%		0.25%	0.50%
Accrued interest including commitment fees				7,000,000	1,000,000
Issued at percent of par															98.00%
Initial yield per annum															9.60%
Accrued interest	46,614,000	28,580,000												1,100,000						7,000		194,000		47,000		19,000
Quarterly amortization of principal																					$ 362,500
Interest rate																							15.00%