Allowance for Doubtful Accounts Receivable, Related Parties

No definition available.

Name:	mtga_AllowanceforDoubtfulAccountsReceivableRelatedParties
Namespace Prefix:	mtga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long-term Development Project, Development Fees

+ References

No definition available.

+ Details

Name:	mtga_LongTermDevelopmentProjectDevelopmentFees
Namespace Prefix:	mtga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-term Development Project, Management Fees

+ References

No definition available.

+ Details

Name:	mtga_LongTermDevelopmentProjectManagementFees
Namespace Prefix:	mtga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-Term Development Project, Receivables, Additional Margin On Stated Rate

+ References

No definition available.

+ Details

Name:	mtga_LongTermDevelopmentProjectReceivablesAdditionalMarginOnStatedRate
Namespace Prefix:	mtga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-Term Development Project, Receivables, Stated Interest Rate

+ References

No definition available.

+ Details

Name:	mtga_LongTermDevelopmentProjectReceivablesStatedInterestRate
Namespace Prefix:	mtga_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-Term Development Project, Receivables, Term

+ References

No definition available.

+ Details

Name:	mtga_LongTermDevelopmentProjectReceivablesTerm
Namespace Prefix:	mtga_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Long-term Development Project, Term of Management Agreement

+ References

No definition available.

+ Details

Name:	mtga_LongtermDevelopmentProjectTermofManagementAgreement
Namespace Prefix:	mtga_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Authorized Table Games, Leasing

+ References

No definition available.

+ Details

Name:	mtga_NumberOfAuthorizedTableGamesLeasing
Namespace Prefix:	mtga_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Authorized Gaming Machines, Leasing

+ References

No definition available.

+ Details

Name:	mtga_NumberofAuthorizedGamingMachinesLeasing
Namespace Prefix:	mtga_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Authorized Gaming Machines, Operation

+ References

No definition available.

+ Details

Name:	mtga_NumberofAuthorizedGamingMachinesOperation
Namespace Prefix:	mtga_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Authorized Table Games, Operation

+ References

No definition available.

+ Details

Name:	mtga_NumberofAuthorizedTableGamesOperation
Namespace Prefix:	mtga_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

[Line Items] for Schedule of Long-term Development Projects [Table]

+ References

No definition available.

+ Details

Name:	mtga_ScheduleOfLongTermDevelopmentProjectsLineItems
Namespace Prefix:	mtga_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3-4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(3))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The value of notes retired (or transferred to another entity) in noncash investing or financing transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

+ Details

Name:	us-gaap_NotesReduction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromCollectionOfNotesReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) of physical assets used in the normal conduct of business and not intended for resale, from reclassification, impairment, donation, or changes classified as other. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentTransfersAndChanges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Related Parties
-URI http://asc.fasb.org/extlink&oid=16382449

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

+ Details

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=mtga_SalishanMoheganLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=mtga_CowlitzTribeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherOwnershipInterestsByNameAxis=mtga_SalishanMoheganTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=mtga_SalishanMoheganLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mtga_LongTermDevelopmentProjectAxis=mtga_CowlitzProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=mtga_CowlitzTribeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=mtga_CowlitzTribalGamingAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OtherOwnershipInterestsByNameAxis=mtga_SalishanMoheganLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mtga_MoheganVenturesNorthwestLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mtga_SalishanCompanyLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mtga_MoheganTribeOfIndiansOfConnecticutMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mtga_SalishanMoheganLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

MOHEGAN VENTURES-NORTHWEST, LLC (COWLITZ PROJECT) (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Apr. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2016 USD ($) table_game gaming_machine	Sep. 30, 2015 USD ($)	Dec. 31, 2006 a
Salishan-Mohegan \| Cowlitz Tribe
Schedule of Long-term Development Projects [Line Items]
Accounts and Notes Receivable, Net	$ 344
Salishan-Mohegan Two \| Salishan-Mohegan
Schedule of Long-term Development Projects [Line Items]
Membership or limited partnership interest (as a percent)				100.00%
Cowlitz Tribal Gaming Authority \| Salishan-Mohegan
Schedule of Long-term Development Projects [Line Items]
Accounts Receivable, Related Parties				$ 81,900	$ 90,700
Allowance for Doubtful Accounts Receivable, Related Parties				16,400	$ 21,200
Revenue from Related Parties				$ 9,200
Cowlitz Project \| Cowlitz Tribe
Schedule of Long-term Development Projects [Line Items]
Number of authorized gaming machines, operation \| gaming_machine				3,000
Number of authorized table games, operation \| table_game				75
Number of authorized gaming machines, leasing \| gaming_machine				1,075
Number of authorized table games, leasing \| table_game				60
Cowlitz Project \| Salishan-Mohegan
Schedule of Long-term Development Projects [Line Items]
Term of management agreement				7 years
Proceeds from Collection of Notes Receivable		$ 19,400
Long-Term Development Project, Receivables, Term		7 years
Long-Term Development Project, Receivables, Additional Margin On Stated Rate		1.00%
Long-Term Development Project, Receivables, Stated Interest Rate		12.50%
Cowlitz Project \| Salishan-Mohegan \| Cowlitz Tribe \| Land
Schedule of Long-term Development Projects [Line Items]
Land transferred to CTGA			$ 20,000
Cowlitz Project \| Salishan-Mohegan \| Cowlitz Tribal Gaming Authority (CTGA)
Schedule of Long-term Development Projects [Line Items]
Reduction in notes payable			$ 342
Cowlitz Project \| Salishan-Mohegan \| Cowlitz Tribal Gaming Authority (CTGA) \| Land
Schedule of Long-term Development Projects [Line Items]
Land transferred to CTGA	$ 686
Cowlitz Project \| Salishan-Mohegan
Schedule of Long-term Development Projects [Line Items]
Development fee (as a percent)				3.00%
Area of land purchased (in acres) \| a						152
Management fee				24.00%
Cowlitz Project \| Mohegan Ventures-Northwest \| Salishan-Mohegan
Schedule of Long-term Development Projects [Line Items]
Membership or limited partnership interest (as a percent)				49.15%
Cowlitz Project \| Salishan Company, LLC \| Salishan-Mohegan
Schedule of Long-term Development Projects [Line Items]
Membership or limited partnership interest (as a percent)				40.00%
Cowlitz Project \| Mohegan Tribe \| Salishan-Mohegan
Schedule of Long-term Development Projects [Line Items]
Membership or limited partnership interest (as a percent)				10.85%
Cowlitz Project \| Salishan-Mohegan \| Salishan-Mohegan Two
Schedule of Long-term Development Projects [Line Items]
Membership or limited partnership interest (as a percent)				100.00%