COWLITZ PROJECT (Details) - Related Party [Domain] $ in Thousands	1 Months Ended			9 Months Ended	12 Months Ended
	Mar. 31, 2015 Lease_Option	Jun. 30, 2013 lawsuit	Mar. 31, 2013 lawsuit	Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($) gaming_facility gaming_machine table_game	Dec. 31, 2006 a
Schedule of Long-term Development Projects [Line Items]
Carrying value of land				$ 1,349,997	$ 1,424,068
Cowlitz Project | Salishan-Mohegan
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%
Number of authorized gaming facilities | gaming_facility					2
Number of authorized gaming machines, leasing | gaming_machine					975
Number of authorized gaming machines, operation | gaming_machine					3,000
Number of authorized table games, operation | table_game					125
Annual Rate					10.00%
Number of claims dismissed | lawsuit			2
New claims filed | lawsuit		2
Operating leases, term of contract	25 years
Operating leases, renewal term	25 years
Operating Lease, Term, Number of Options to Extend 25 year Lease | Lease_Option	2
Land | Cowlitz Project | Salishan-Mohegan
Schedule of Long-term Development Projects [Line Items]
Carrying value of land					$ 20,000