BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Intangible Assets (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jul. 31, 2019	Jan. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Accounting Policies [Abstract]
License agreement term			5 years
Payment by third-party for interactive gaming and sports wagering licenses	$ 10,000	$ 8,000	$ 18,000	$ 0	$ 0