BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Intangible Assets and Relinquishment Liability (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2012	Oct. 31, 2006 Pennsylvania Facilities Slot Machine License	Sep. 30, 2006 Pennsylvania Facilities Slot Machine License	Jun. 30, 2010 Pennsylvania Facilities Table Game Certificate	Sep. 30, 2012 Pennsylvania Facilities Mohegan Sun trademark
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible asset recorded		$ 50.0	$ 214.0	$ 16.5	$ 119.7
Relinquishment fee percentage	5.00%

The aggregate cost of a major indefinite-lived intangible asset class acquired, during the period, either individually or as part of a group of assets (in either an asset acquisition or business combination).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_AcquiredIndefiniteLivedIntangibleAssetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant