BASIS OF PRESENTATION - Long-Term Receivables (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Jun. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	$ 84,109	$ 102,338
Additions: Advances and other loans, including interest receivable		3,335	8,567
Additions: Development fees		1,446	7,260
Deductions: Payments received	[2]	(2,860)	(22,342)
Deductions: Adjustments	[3]		(9,793)
Balance, end of period	[1]	86,030	86,030
Interest receivable		47,900	47,900	$ 45,700	$ 43,400
Affiliates
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	81,582	100,527
Additions: Advances and other loans, including interest receivable		2,839	7,273
Additions: Development fees		1,446	7,260
Deductions: Payments received	[2]	(2,818)	(22,218)
Deductions: Adjustments	[3]		(9,793)
Balance, end of period	[1]	83,049	83,049
Others
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	2,527	1,811
Additions: Advances and other loans, including interest receivable		496	1,294
Additions: Development fees		0	0
Deductions: Payments received	[2]	(42)	(124)
Deductions: Adjustments	[3]		0
Balance, end of period	[1]	$ 2,981	$ 2,981

[1] Includes interest receivable of $47.9 million, $45.7 million and $43.4 million as of June 30, 2016, March 31, 2016 and September 30, 2015, respectively.

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

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