SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - Reserves for uncollectible accounts - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balances at Beginning of Year	$ 20,785	$ 27,384	$ 42,335
Charges to Costs and Expenses	4,396	3,392	3,526
Deductions from Reserves	12,916	9,991	18,477
Balances at End of Year	12,265	20,785	27,384
Salishan-Mohegan, LLC
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Write-off of receivables	$ 10,300	$ 9,200	7,300
Wisconsin Tribal Gaming
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Write-off of receivables			$ 9,800