LONG-TERM DEBT - Line of Credit and Credit Facility (Details) - USD ($)	Jun. 30, 2017	Oct. 31, 2016	Sep. 30, 2016	Nov. 30, 2015	Jul. 31, 2012
Line of Credit Facility [Line Items]
Accrued interest payable	$ 8,703,000		$ 5,512,000
Line of Credit | Credit Facility
Line of Credit Facility [Line Items]
Borrowing capacity		$ 25,000,000
Amount drawn under credit facility	0
Accrued interest payable	$ 31,000		14,000
Downs Lodging, LLC | Downs Lodging Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Loan face amount					$ 45,000,000.0
Downs Lodging, LLC | Prior Downs Lodging Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Loan face amount				$ 25,000,000.0
Downs Lodging, LLC | Downs Lodging Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Accrued interest payable			$ 73,000