BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Promotional Allowances (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	$ 98,944,000	$ 95,857,000	$ 99,197,000
Cost of providing promotional allowances	83,687,000	81,577,000	85,395,000
Reductions to gaming revenues related to discounts provided on patron losses	12,200,000	11,000,000	10,700,000
Reductions to gaming revenues related to player club points redeemed for cash	1,300,000	1,400,000	1,100,000
Food and beverage
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	43,264,000	38,390,000	40,925,000
Cost of providing promotional allowances	37,936,000	34,194,000	37,140,000
Hotel
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	14,721,000	13,799,000	14,127,000
Cost of providing promotional allowances	8,979,000	7,216,000	7,754,000
Retail, entertainment, and other
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	40,959,000	43,668,000	44,145,000
Cost of providing promotional allowances	$ 36,772,000	$ 40,167,000	$ 40,501,000