BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Promotional Allowances (Details) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	$ 99,197,000	$ 108,809,000	$ 117,664,000
Cost of providing promotional allowances	85,395,000	91,921,000	103,806,000
Reductions to gaming revenues related to discounts provided on patron losses	10,700,000	9,700,000	8,000,000
Reductions to gaming revenues related to player club points redeemed for cash	1,100,000	933,000	1,000,000
Food and beverage
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	40,925,000	43,710,000	47,447,000
Cost of providing promotional allowances	37,140,000	40,803,000	47,551,000
Hotel
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	14,127,000	14,850,000	15,365,000
Cost of providing promotional allowances	7,754,000	8,873,000	9,117,000
Retail, entertainment, and other
Schedule of Promotional Allowances [Line Items]
Retail value of providing promotional allowances	44,145,000	50,249,000	54,852,000
Cost of providing promotional allowances	$ 40,501,000	$ 42,245,000	$ 47,138,000