COMMITMENTS AND CONTINGENCIES (Details) (USD $)	0 Months Ended	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
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	5.50%	11.00%
Slot win contributions		36,300,000	37,100,000
Slot win contributions outstanding		11,500,000		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		29,700,000	30,200,000
Slot machine tax expense, outstanding		6,500,000		5,500,000
Pennsylvania Slot Machine Tax | Downs Racing, L.P.
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]
Initial taxation period		2 years
Table game tax rate		12.00%
Additional local tax		2.00%
Table game tax expense recognized		1,500,000	1,500,000
Table game tax expense outstanding		207,000		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		1,100,000	1,200,000
Regulatory fee outstanding		160,000		132,000
Pennsylvania Gaming Control Board Loans
Commitments and Contingencies [Line Items]
Loans granted 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		160,000	163,000
Horsemen's Agreement
Commitments and Contingencies [Line Items]
Purses earned by horsemen and other fees outstanding		6,300,000		7,800,000
Priority Distribution Agreement
Commitments and Contingencies [Line Items]
Annual limit of priority distribution payments		14,000,000
Priority distribution payments		$ 4,800,000	$ 4,700,000