BASIS OF PRESENTATION - Long-Term Receivables (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Mar. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	$ 79,886	$ 102,338
Additions: Issuance of affiliate advances and other loans, including interest receivable		2,909	5,232
Additions: Development fees		1,355	5,814
Deductions: Payments received	[2]	(41)	(19,482)
Deductions: Adjustments	[3]		(9,793)
Balance, end of period	[1]	84,109	84,109
Interest receivable		45,700	45,700	$ 43,700	$ 43,400
Affiliates
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	77,603	100,527
Additions: Issuance of affiliate advances and other loans, including interest receivable		2,624	4,434
Additions: Development fees		1,355	5,814
Deductions: Payments received	[2]	0	(19,400)
Deductions: Adjustments	[3]		(9,793)
Balance, end of period	[1]	81,582	81,582
Others
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	2,283	1,811
Additions: Issuance of affiliate advances and other loans, including interest receivable		285	798
Additions: Development fees		0	0
Deductions: Payments received	[2]	(41)	(82)
Deductions: Adjustments	[3]		0
Balance, end of period	[1]	$ 2,527	$ 2,527

[1] Includes interest receivable of $45.7 million, $43.7 million and $43.4 million as of March 31, 2016, December 31, 2015 and September 30, 2015, respectively.

[2] Payments of receivables from affiliates represent a partial repayment of the Salishan-Mohegan receivables.

[3] Adjustments represent the write-off of the WTG receivables.