ORGANIZATION AND ACQUISITION OF THE NIAGRA GAMING BUNDLE - Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Net revenues	$ 415,162	$ 433,913	$ 1,206,916	$ 1,285,790
Net income	$ 17,128	$ 37,455	$ 7,386	$ 95,328