COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Mohegan Tribe
Commitments and Contingencies [Line Items]
Term of lease	25 years
Renewable period of additional term	25 years
Slot Win Contributions
Commitments and Contingencies [Line Items]
Contribution frequency period	12 months
Contribution determination criteria 1, percent of gross revenues from slot machines, lesser of	30.00%
Contribution determination criteria 2a, lesser of, percent of gross revenues from slot machines, greater of	25.00%
Contribution determination criteria 2b, lesser of, set cash contribution	$ 80,000,000.0
Contribution rate applied to excess free promotional play revenues in excess of limitation, if other than standard rate	25.00%
Limitation of excluded free promotional play as a percent of gross revenues from slot machines	11.00%
Slot win contributions	146,500,000	155,800,000	173,100,000
Slot win contributions outstanding	11,600,000	12,700,000
Pennsylvania Slot Machine Tax
Commitments and Contingencies [Line Items]
Tax rate applied to percent of gross revenues from slot machines	55.00%
Portion of taxed revenues subject to minimum annual local share assessment	2.00%
Minimum annual local share assessment	10,000,000.0
Escrow deposit for tax payments	1,500,000.0
Slot machine tax expense recognized	122,300,000	124,000,000	134,200,000
Slot machine tax expense, outstanding	4,600,000	5,500,000
Pennsylvania Slot Machine Tax | Downs Racing
Commitments and Contingencies [Line Items]
Number of slot machines at Mohegan Sun at Pocono Downs permitted by license	3,000
Number of slot machines at Mohegan Sun at Pocono Downs permitted by license expandable to	5,000
Pennsylvania Table Game Tax
Commitments and Contingencies [Line Items]
Subsequent table game tax rate	12.00%
Additional local tax	2.00%
Table game tax expense recognized	6,300,000	6,100,000	6,800,000
Table game tax expense outstanding	156,000	127,000
Pennsylvania Regulatory Fee
Commitments and Contingencies [Line Items]
Fee rate, percent of gross revenues from slot machines and table games	1.50%
Regulatory fee recognized	4,700,000	4,200,000	5,100,000
Regulatory fee outstanding	147,000	132,000
Pennsylvania Gaming Control Board Loans
Commitments and Contingencies [Line Items]
Loans obtained by PGCB	36,100,000
Additional Loans granted by PGCB	63,800,000
Number of authorized gaming facilities	14
Number of authorized gaming facilities that have commenced operations	12
PGCB loan repayment period	10 years
PGCB loan repayment expense	638,000	633,000	659,000
Horsemen's Agreement
Commitments and Contingencies [Line Items]
Purses earned by horsemen and other fees outstanding	8,100,000	7,800,000
Priority Distribution Agreement
Commitments and Contingencies [Line Items]
Annual initial amount of priority distribution payments	14,000,000
Priority distribution payments	19,500,000	19,200,000	18,800,000
Town of Montville Agreement
Commitments and Contingencies [Line Items]
Annual payments	$ 500,000
Land Lease Agreement
Commitments and Contingencies [Line Items]
Rental fee, percent of annual revenues for periods not occupied by primary tenant	8.00%
Land Lease Agreement | Mohegan Tribe
Commitments and Contingencies [Line Items]
Term of lease	25 years
Renewable period of additional term	25 years