LONG-TERM DEBT - Credit Facilities (Details) (USD $)												1 Months Ended				0 Months Ended			1 Months Ended								0 Months Ended			1 Months Ended		9 Months Ended	1 Months Ended				0 Months Ended
	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2014 Credit Facility	Jun. 30, 2014 Credit Facility Prior Bank Credit Facility	Sep. 30, 2013 Credit Facility Prior Bank Credit Facility	Mar. 31, 2012 Credit Facility Prior Bank Credit Facility	Mar. 31, 2012 Credit Facility Prior Bank Credit Facility Letter of Credit	Jun. 30, 2014 Credit Facility Term Loan Credit Facility	Sep. 30, 2013 Credit Facility Term Loan Credit Facility	Mar. 31, 2012 Credit Facility Term Loan Credit Facility	Nov. 30, 2013 Credit Facility Senior Secured Credit Facilities Senior Secured Notes	Nov. 30, 2013 Credit Facility Senior Secured Credit Facilities Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 London Interbank Offered Rate (LIBOR)	Nov. 30, 2013 Credit Facility Senior Secured Credit Facilities Revolving Loans	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562	Sep. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Eurodollar Rate Term Loans	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Eurodollar Rate Term Loans	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Senior Secured Notes	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Senior Secured Notes Minimum	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Senior Secured Notes Maximum	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Senior Secured Notes Federal Funds Effective Swap Rate	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Senior Secured Notes London Interbank Offered Rate (LIBOR) Minimum	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Senior Secured Notes London Interbank Offered Rate (LIBOR) Maximum	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan A, due June 2018, net of discount of $562 Senior Secured Notes One-Month London Interbank Offered Rate (LIBOR)	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841	Sep. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841 Eurodollar Rate Term Loans	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841 Eurodollar Rate Term Loans	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841 Senior Secured Notes	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841 Senior Secured Notes London Interbank Offered Rate (LIBOR)	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841 Senior Secured Notes Base Rate	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841 Revolving Loans	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841 Revolving Loans Minimum	Nov. 30, 2013 Credit Facility Senior Secured Credit Facility - Term Loan B, due June 2018, net of discount of $8,841 Revolving Loans Maximum	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Revolving, due June 2018	Sep. 30, 2013 Credit Facility Senior Secured Credit Facility - Revolving, due June 2018	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Revolving, due June 2018 Eurodollar Rate Revolving Loans	Jun. 30, 2014 Credit Facility Senior Secured Credit Facility - Revolving, due June 2018 Eurodollar Rate Revolving Loans	Jun. 30, 2014 Credit Facility Line of Credit	Nov. 30, 2013 Credit Facility Line of Credit	Sep. 30, 2013 Credit Facility Line of Credit	Jun. 30, 2014 Credit Facility Downs Lodging Credit Facility	Sep. 30, 2013 Credit Facility Downs Lodging Credit Facility	Jun. 30, 2014 Credit Facility Downs Lodging Credit Facility Downs Lodging, LLC	Sep. 30, 2013 Credit Facility Downs Lodging Credit Facility Downs Lodging, LLC	Jul. 31, 2012 Credit Facility Downs Lodging Credit Facility Downs Lodging, LLC
Debt Instrument [Line Items]
Credit facility outstanding						$ 400,000,000.0																													$ 0				$ 0
Borrowing capacity							75,000,000.0																																	16,500,000.0
Accrued interest including commitment fees			1,700,000		61,000
Loan face amount										225,000,000.0	955,000,000.0		100,000,000					125,000,000											730,000,000																	45,000,000.0
Accrued interest payable	31,005,000	23,296,000							1,100,000																														13,000		0			375,000	0
Debt instrument, amortization of principal, percentage, year one																		5.00%
Debt instrument, amortization of principal, percentage, year two																		7.50%
Debt instrument, amortization of principal, percentage, year three																		10.00%
Debt instrument, amortization of principal, percentage, annual																													1.00%
Debt outstanding														121,900,000											726,400,000										20,000,000
Letters of credit issued																																			2,900,000
Remaining borrowing capacity																																			76,200,000
Basis spread on variable rate																4.50%					0.50%			1.00%			4.50%			4.50%	3.50%						4.50%
Variable rate, measurement period												1 month
Variable rate basis, minimum																														1.00%	2.00%
Variable rate, leverage-based margin																			2.50%	3.50%		3.50%	4.50%
Long-term debt, excluding capital leases	$ 1,735,303,000	$ 1,682,312,000		$ 0	$ 393,000,000			$ 0	$ 221,995,000					$ 121,313,000	$ 0										$ 717,509,000	$ 0									$ 20,000,000	$ 0		$ 20,000,000				$ 45,000,000	$ 45,000,000
Variable rate at period end																	0.23%											1.00%										0.16%
Fee assessed on unused revolving credit																																0.50%	0.375%	0.50%
Interest rate																																														13.00%
Interest due monthly																																														10.00%
Interest due at maturity																																														3.00%
Exit fee																																														3.00%