LONG-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Oct. 31, 2016	Sep. 30, 2016	Aug. 31, 2013	Mar. 31, 2012
Debt Schedule [Abstract]
Long term debt, gross	$ 1,714,284
Long-term debt, excluding capital leases	1,673,416		$ 1,685,167
Less: current portion of long-term debt	(75,128)		(29,759)
Long-term debt, net of current portion	1,598,288		1,655,408
Credit Facility | Prior Senior Secured Credit Facility - Revolving, due June 2018
Debt Schedule [Abstract]
Long term debt, gross	0		13,000
Credit Facility | Prior Senior Secured Credit Facility - Term Loan A, due June 2018
Debt Schedule [Abstract]
Long term debt, gross	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, gross	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, gross	13,000		0
Credit Facility | Senior Secured Credit Facility - Term Loan A, due October 2021
Debt Schedule [Abstract]
Long term debt, gross	403,588		0
Unamortized discount and debt issuance costs	8,037
Credit Facility | Senior Secured Credit Facility - Term Loan B, due October 2023
Debt Schedule [Abstract]
Long term debt, gross	762,354		0
Unamortized discount and debt issuance costs	18,721
Credit Facility | Mohegan Expo Credit Facility, due April 2022
Debt Schedule [Abstract]
Long term debt, gross	5,094		0
Unamortized discount and debt issuance costs	1,406
Credit Facility | Downs Lodging Credit Facility, due November 2019
Debt Schedule [Abstract]
Long term debt, gross	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, gross	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, gross	487,296		$ 0
Unamortized discount and debt issuance costs	$ 12,704
Note stated interest rate	7.875%	7.875%
Senior Unsecured Notes | 2015 Senior Unsecured Notes, due December 2017
Debt Schedule [Abstract]
Long term debt, gross	$ 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, gross	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]
Promissory notes	0		$ 5,500
Promissory Notes | 2013 Mohegan Tribe Promissory Note, due December 2018
Debt Schedule [Abstract]
Promissory notes	0		7,420
Other
Debt Schedule [Abstract]
Long term debt, gross	$ 2,084		$ 2,289