COWLITZ PROJECT (Details) $ in Thousands	1 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) gaming_machine table_game	Sep. 30, 2014 table_game	Sep. 30, 2015 USD ($)	Dec. 31, 2006 a
Salishan-Mohegan | Affiliates
Schedule of Long-term Development Projects [Line Items]
Receivables and accrued interest				$ 78,600	$ 78,600		$ 90,700
Reserve for doubtful collections				15,700	15,700		$ 21,200
Development fees				$ 1,500	$ 7,300
Salishan-Mohegan | Cowlitz Tribe
Schedule of Long-term Development Projects [Line Items]
Additional receivable recorded	$ 344
Salishan-Mohegan | Cowlitz Project
Schedule of Long-term Development Projects [Line Items]
Development fee					3.00%
Area of land purchased (in acres) | a								152
Term of management agreement					7 years
Management fee					24.00%
Accounts receivable repaid		$ 19,400
Notes receivable term		7 years
Additional interest rate (as a percent)		1.00%
Financing rate (as a percent)		12.50%
Salishan-Mohegan | Cowlitz Project | Cowlitz Tribe | Land
Schedule of Long-term Development Projects [Line Items]
Property and equipment, net			$ 20,000
Salishan-Mohegan | Cowlitz Project | CTGA
Schedule of Long-term Development Projects [Line Items]
Reduction in notes payable			$ 342
Salishan-Mohegan | Cowlitz Project | CTGA | Land
Schedule of Long-term Development Projects [Line Items]
Property and equipment, net	$ 686
Cowlitz Tribe | Cowlitz Project
Schedule of Long-term Development Projects [Line Items]
Number of authorized gaming machines, operation | gaming_machine					3,000
Number of authorized table games, operation | table_game						75
Number of authorized gaming machines, leasing | gaming_machine					1,075
Number of authorized gaming facilities | table_game					60