SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - Reserves for uncollectible accounts - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balances at Beginning of Year	$ 12,265	$ 20,785	$ 27,384
Charges to Costs and Expenses	976	4,396	3,392
Deductions from Reserves	1,526	12,916	9,991
Balances at End of Year	11,715	12,265	$ 20,785
Salishan-Mohegan, LLC
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Write-off of receivables	$ 10,300	$ 9,200