BASIS OF PRESENTATION - Long-Term Receivables (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Jun. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	$ 94,157	$ 69,208
Additions: Issuance of affiliate advances and other loans, including interest receivable		3,871	8,946
Additions: Cowlitz Project land transfer	[2]		19,951
Deductions: Payments received		(40)	(117)
Deductions: Adjustments		(779)
Balance, end of period	[1]	97,209	97,209
Interest receivable		41,000	41,000	$ 39,300	$ 35,700
Affiliates
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	91,567	66,596
Additions: Issuance of affiliate advances and other loans, including interest receivable		3,803	8,823
Additions: Cowlitz Project land transfer	[2]		19,951
Deductions: Payments received		0	0
Deductions: Adjustments		0
Balance, end of period	[1]	95,370	95,370
Tenants and Others
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	2,590	2,612
Additions: Issuance of affiliate advances and other loans, including interest receivable		68	123
Additions: Cowlitz Project land transfer	[2]		0
Deductions: Payments received		(40)	(117)
Deductions: Adjustments		(779)
Balance, end of period	[1]	$ 1,839	$ 1,839

[1] Includes interest receivable of $41.0 million, $39.3 million and $35.7 million as of June 30, 2015, March 31, 2015 and September 30, 2014, respectively. The WTG receivables no longer accrue interest pursuant to a release and reimbursement agreement entered into in September 2010.

[2] Relates to the transfer of land for the proposed Cowlitz Project site between Salishan-Mohegan and the Cowlitz Tribe (refer to Note 7).