LONG-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Oct. 14, 2016	Sep. 30, 2016	Aug. 31, 2013	Mar. 31, 2012
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	$ 1,812,569
Long-term Debt, Including Due to Related Parties	1,771,553		$ 1,685,167
Less: current portion of long-term debt	(56,472)		(29,759)
Long-term debt, net of current portion	1,715,081		1,655,408
Credit Facility | Prior Senior Secured Credit Facility - Revolving, due June 2018
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	0		13,000
Credit Facility | Prior Senior Secured Credit Facility - Term Loan A, due June 2018
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	0		95,399
Unamortized discount and debt issuance costs			1,464
Credit Facility | Prior Senior Secured Credit Facility - Term Loan B, due June 2018
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	0		765,002
Unamortized discount and debt issuance costs			11,119
Credit Facility | Senior Secured Credit Facility - Revolving, due October 2021
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	99,000		0
Credit Facility | Senior Secured Credit Facility - Term Loan A, due October 2021
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	419,648		0
Unamortized discount and debt issuance costs	8,664
Credit Facility | Senior Secured Credit Facility - Term Loan B, due October 2023
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	764,010		0
Unamortized discount and debt issuance costs	19,027
Credit Facility | Downs Lodging Credit Facility, due November 2019
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	0		20,396
Unamortized discount and debt issuance costs			1,260
Senior Unsecured Notes | 2013 9 3/4% Senior Unsecured Notes, due September 2021
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	0		578,525
Unamortized discount and debt issuance costs			$ 6,475
Note stated interest rate			9.75%	9.75%
Senior Unsecured Notes | 2016 7 7/8% Senior Unsecured Notes, due October 2024
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	$ 486,675		$ 0
Note stated interest rate	7.875%	7.875%
Senior Unsecured Notes | 2015 Senior Unsecured Notes, due December 2017
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	$ 0		98,321
Unamortized discount and debt issuance costs			1,679
Senior Subordinated Notes | 2012 11% Senior Subordinated Notes, due September 2018
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	0		99,315
Unamortized discount and debt issuance costs			$ 875
Note stated interest rate			11.00%		11.00%
Promissory Notes | 2012 Mohegan Tribe Minor's Trust Promissory Note, due March 2017
Debt Schedule [Abstract]
Notes Payable, Related Parties	0		$ 5,500
Promissory Notes | 2013 Mohegan Tribe Promissory Note, due December 2018
Debt Schedule [Abstract]
Notes Payable, Related Parties	0		7,420
Other
Debt Schedule [Abstract]
Long-term debt, excluding capital leases	$ 2,220		$ 2,289