LONG-TERM DEBT - Schedule and Introduction (Details) (USD $)	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	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] 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] Mohegan Tribe Credit Facility, due September 2013 [Member]	Mar. 31, 2012 Credit Facility [Member] Mohegan Tribe Credit Facility, due September 2013 [Member]	Sep. 30, 2011 Credit Facility [Member] Mohegan Tribe Credit Facility, due September 2013 [Member]	Jun. 30, 2012 Credit Facility [Member] Salishan-Mohegan Bank Credit Facility, due March 2012 [Member]	Sep. 30, 2011 Credit Facility [Member] Salishan-Mohegan Bank Credit Facility, due March 2012 [Member]	Jun. 30, 2012 Senior Secured Notes [Member] 2009 11 1/2% Second Lien Senior Secured Notes, due November 2017, net of discount of $6 and $6,325, respectively [Member]	Sep. 30, 2011 Senior Secured Notes [Member] 2009 11 1/2% Second Lien Senior Secured Notes, due November 2017, net of discount of $6 and $6,325, respectively [Member]	Oct. 31, 2009 Senior Secured Notes [Member] 2009 11 1/2% Second Lien Senior Secured Notes, due November 2017, net of discount of $6 and $6,325, respectively [Member]	Jun. 30, 2012 Senior Secured Notes [Member] 2012 11 1/2% Second Lien Senior Secured Notes, due November 2017, net of discount of $5,959 [Member]	Mar. 06, 2012 Senior Secured Notes [Member] 2012 11 1/2% Second Lien Senior Secured Notes, due November 2017, net of discount of $5,959 [Member]	Sep. 30, 2011 Senior Secured Notes [Member] 2012 11 1/2% Second Lien Senior Secured Notes, due November 2017, net of discount of $5,959 [Member]	Jun. 30, 2012 Senior Secured Notes [Member] 2012 10 1/2% Third Lien Senior Secured Notes, due December 2016 [Member]	Mar. 06, 2012 Senior Secured Notes [Member] 2012 10 1/2% Third Lien Senior Secured Notes, due December 2016 [Member]	Sep. 30, 2011 Senior Secured Notes [Member] 2012 10 1/2% Third Lien Senior Secured Notes, due December 2016 [Member]	Jun. 30, 2012 Senior Unsecured Notes [Member] 2005 6 1/8% Senior Unsecured Notes, due February 2013 [Member]	Sep. 30, 2011 Senior Unsecured Notes [Member] 2005 6 1/8% Senior Unsecured Notes, due February 2013 [Member]	Feb. 28, 2005 Senior Unsecured Notes [Member] 2005 6 1/8% Senior Unsecured Notes, due February 2013 [Member]	Jun. 30, 2012 Senior Subordinated Notes [Member] 2002 8% Senior Subordinated Notes, due April 2012 [Member]	Sep. 30, 2011 Senior Subordinated Notes [Member] 2002 8% Senior Subordinated Notes, due April 2012 [Member]	Feb. 28, 2002 Senior Subordinated Notes [Member] 2002 8% Senior Subordinated Notes, due April 2012 [Member]	Jun. 30, 2012 Senior Subordinated Notes [Member] 2004 7 1/8% Senior Subordinated Notes, due August 2014 [Member]	Sep. 30, 2011 Senior Subordinated Notes [Member] 2004 7 1/8% Senior Subordinated Notes, due August 2014 [Member]	Aug. 31, 2004 Senior Subordinated Notes [Member] 2004 7 1/8% Senior Subordinated Notes, due August 2014 [Member]	Jun. 30, 2012 Senior Subordinated Notes [Member] 2005 6 7/8% Senior Subordinated Notes, due February 2015 [Member]	Sep. 30, 2011 Senior Subordinated Notes [Member] 2005 6 7/8% Senior Subordinated Notes, due February 2015 [Member]	Feb. 28, 2005 Senior Subordinated Notes [Member] 2005 6 7/8% Senior Subordinated Notes, due February 2015 [Member]	Jun. 30, 2012 Senior Subordinated Notes [Member] 2012 11 % Senior Subordinated Notes, due September 2018 [Member]	Mar. 06, 2012 Senior Subordinated Notes [Member] 2012 11 % Senior Subordinated Notes, due September 2018 [Member]	Sep. 30, 2011 Senior Subordinated Notes [Member] 2012 11 % Senior Subordinated Notes, due September 2018 [Member]	Jun. 30, 2012 Promissory Notes [Member] 2009 Mohegan Tribe Promissory Note, due September 2014 [Member]	Sep. 30, 2011 Promissory Notes [Member] 2009 Mohegan Tribe Promissory Note, due September 2014 [Member]	Sep. 30, 2009 Promissory Notes [Member] 2009 Mohegan Tribe Promissory Note, due September 2014 [Member]	Jun. 30, 2012 Promissory Notes [Member] 2012 Mohegan Tribe Minor's Trust Promissory Note, due March 2016 [Member]	Mar. 31, 2012 Promissory Notes [Member] 2012 Mohegan Tribe Minor's Trust Promissory Note, due March 2016 [Member]	Sep. 30, 2011 Promissory Notes [Member] 2012 Mohegan Tribe Minor's Trust Promissory Note, due March 2016 [Member]
Debt Schedule [Abstract]
Note stated interest rate												15.00%				11.50%		11.50%	11.50%	11.50%		10.50%	10.50%		6.125%		6.125%	8.00%		8.00%	7.125%		7.125%	6.875%		6.875%	11.00%	11.00%				10.00%		10.00%
Unamortized discount									$ 4,218,000							$ 6,000	$ 6,325,000		$ 5,776,000
Long-term debt, subtotal		1,652,996,000		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	194,000	193,675,000		194,024,000		0	417,771,000		0	15,775,000	250,000,000		0	250,000,000		21,156,000	225,000,000		9,654,000	150,000,000		344,190,000		0	10,000,000	10,000,000		20,000,000		0
Plus: net deferred gain on derivative instruments sold		410,000		410,000		641,000
Long-term debt, excluding capital leases		1,653,406,000		1,653,406,000		1,630,416,000
Less: current portion of long-term debt		(27,257,000)		(27,257,000)		(811,100,000)
Long-term debt, net of current portion		1,626,149,000		1,626,149,000		819,316,000
Refinanced debt	961,800,000
Refinancing costs	58,300,000
Loss on early exchange of debt	(14,300,000)	17,000	0	14,323,000	0
Capitalized refinancing costs	$ (44,000,000)