BASIS OF PRESENTATION - Reserves For Doubtful Collection of Long-term Receivables (Details) - Allowance for Notes Receivable $ in Thousands	3 Months Ended
	Dec. 31, 2015 USD ($)
Allowance for Notes, Loans and Financing Receivable, Noncurrent [Roll Forward]
Balance, beginning of period	$ 31,070
Additions: Charges to bad debt expense	709
Deductions: Adjustments	(17,111)	[1]
Balance, end of period	14,668
Affiliates
Allowance for Notes, Loans and Financing Receivable, Noncurrent [Roll Forward]
Balance, beginning of period	31,028
Additions: Charges to bad debt expense	709
Deductions: Adjustments	(17,108)	[1]
Balance, end of period	14,629
Others
Allowance for Notes, Loans and Financing Receivable, Noncurrent [Roll Forward]
Balance, beginning of period	42
Additions: Charges to bad debt expense	0
Deductions: Adjustments	(3)	[1]
Balance, end of period	39
Salishan-Mohegan, LLC
Allowance for Notes, Loans and Financing Receivable, Noncurrent [Roll Forward]
Write-off of receivables	7,300	[1]
Wisconsin Tribal Gaming, LLC
Allowance for Notes, Loans and Financing Receivable, Noncurrent [Roll Forward]
Write-off of receivables	$ 9,800	[1]

[1] Adjustments to reserves for doubtful collection of receivables from affiliates include $7.3 million related to the Salishan-Mohegan receivables and $9.8 million related to the WTG receivables.