BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Long-Term Receivables (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	$ 102,338
Additions: Issuance of affiliate advances and other loans, including interest receivable		12,320
Additions: Development fees, including interest receivable		9,151
Deductions: Payments received	[2]	(23,792)
Deductions: Adjustments	[3]	(9,793)
Balance, end of period	[1]	90,224
Current portion of long-term receivables		4,900	$ 19,600
Notes receivable
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Interest receivable		51,000	$ 43,400
Affiliates
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	100,527
Additions: Issuance of affiliate advances and other loans, including interest receivable		10,592
Additions: Development fees, including interest receivable		9,151
Deductions: Payments received	[2]	(23,626)
Deductions: Adjustments	[3]	(9,793)
Balance, end of period	[1]	86,851
Others
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	[1]	1,811
Additions: Issuance of affiliate advances and other loans, including interest receivable		1,728
Additions: Development fees, including interest receivable		0
Deductions: Payments received	[2]	(166)
Deductions: Adjustments	[3]	0
Balance, end of period	[1]	$ 3,373

[1] Includes current portions of $4.9 million and $19.6 million as of September 30, 2016 and 2015, respectively. Also includes interest receivable of $51.0 million and $43.4 million as of September 30, 2016 and 2015, respectively.

[2] Payments of receivables from affiliates represent partial repayments of the Salishan-Mohegan receivables and development fees earned.

[3] Represent the write-off of fully reserved reimbursable costs and expenses advanced by WTG on behalf of the Menominee Tribe for the Menominee Project following the expiration of a release and reimbursement agreement in December 2015.