ORGANIZATION (Details)	9 Months Ended
	Jun. 30, 2016 a segment member
Entity Information [Line Items]
Number of reportable segments | segment	2
Downs Racing, L.P.
Entity Information [Line Items]
General partnership interest percentage	99.99%
Backside, L.P.
Entity Information [Line Items]
General partnership interest percentage	99.99%
Mill Creek Land, L.P.
Entity Information [Line Items]
General partnership interest percentage	99.99%
Northeast Concessions, L.P.
Entity Information [Line Items]
General partnership interest percentage	99.99%
MMCT Venture, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	50.00%
Mohegan Tribe of Indians of Connecticut
Entity Information [Line Items]
Size of tribe reservation (in acres)	595
Mohegan Tribe of Indians of Connecticut | Salishan-Mohegan, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	10.85%
Mohegan Tribal Gaming Authority
Entity Information [Line Items]
Size of gaming and entertainment complex (in acres)	185
Number of members on management board, including tribal council members | member	9
Mohegan Basketball Club, LLC | WNBA, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	4.20%
Mohegan Lacrosse, LLC | New England Black Wolves
Entity Information [Line Items]
Membership or limited partnership interest percentage	50.00%
Mohegan Lacrosse, LLC | New England Black Wolves
Entity Information [Line Items]
Membership or limited partnership interest percentage	50.00%
Mohegan Commercial Ventures-PA, LLC | Downs Racing, L.P.
Entity Information [Line Items]
General partnership interest percentage	0.01%
Mohegan Commercial Ventures-PA, LLC | Backside, L.P.
Entity Information [Line Items]
General partnership interest percentage	0.01%
Mohegan Commercial Ventures-PA, LLC | Mill Creek Land, L.P.
Entity Information [Line Items]
General partnership interest percentage	0.01%
Mohegan Commercial Ventures-PA, LLC | Northeast Concessions, L.P.
Entity Information [Line Items]
General partnership interest percentage	0.01%
Downs Racing, L.P.
Entity Information [Line Items]
Size of site on which gaming and entertainment complex is located (in acres)	400
Mohegan Ventures-Northwest, LLC | Salishan-Mohegan, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	49.15%
Salishan-Mohegan, LLC | Salishan-Mohegan Two, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Ventures Wisconsin, LLC | Wisconsin Tribal Gaming, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
MTGA Gaming, LLC | Mohegan Gaming & Hospitality, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Gaming & Hospitality, LLC | Mohegan Resorts, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Resorts, LLC | Mohegan Resorts Mass, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Gaming Advisors | Mohegan New Jersey Entities
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Gaming Advisors | MGA Gaming MA, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Gaming Advisors | MGA Holding MA, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Gaming Advisors | Inspire Integrated Resort Co., Ltd
Entity Information [Line Items]
Membership or limited partnership interest percentage	50.32%
Mohegan Gaming Advisors | MGNV, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Gaming Advisors | MGLA, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
Mohegan Gaming Advisors | MGBR, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
MGA Holding NJ, LLC | Resorts Casino Hotel in Atlantic City, New Jersey
Entity Information [Line Items]
Membership or limited partnership interest percentage	10.00%
MGA Holding MA, LLC | MGA Palmer Partners, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%
MGA Palmer Partners, LLC | Mohegan Sun Massachusetts, LLC
Entity Information [Line Items]
Membership or limited partnership interest percentage	100.00%