BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Promotional Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	$ 96,593	$ 97,346	$ 98,944
Cost of providing promotional allowances	76,650	79,079	83,687
Reductions to gaming revenues related to discounts provided on patron losses	15,900	9,700	12,200
Reductions to gaming revenues related to player club points redeemed for cash	1,500	1,400	1,300
Food and beverage
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	41,800	42,192	43,264
Cost of providing promotional allowances	33,536	35,122	37,936
Hotel
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	15,364	15,142	14,721
Cost of providing promotional allowances	8,615	8,398	8,979
Retail, entertainment and other
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	39,429	40,012	40,959
Cost of providing promotional allowances	$ 34,499	$ 35,559	$ 36,772