Long-term Debt, Quarterly Interest Payment

No definition available.

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to interest.

+ 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 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of the required periodic payments applied to principal.

+ 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 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e7018-107765

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-Name Accounting Standards Codification

-Topic 210

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-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingDecember312012ThroughSeptember302013Member
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingDecember312013throughMarch312014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingJune302015Member
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingSeptember302015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mtga_MoheganTribeMinorsTrustPromissoryNote2012Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingSeptember302015throughMarch312016Member
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Balance Type:
Period Type:

- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingDecember312012throughMarch312014Member
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Data Type:	na
Balance Type:
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- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingJuly12014andSeptember302015Member
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Balance Type:
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- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingDecember312015throughSeptember302016Member
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- Details

Name:	mtga_PaymentByDateAxis=mtga_CommencingMarch312017Member
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- Details

Name:	us-gaap_DebtInstrumentAxis=mtga_MoheganTribePromissoryNote2013Member
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LONG-TERM DEBT - Promissory Notes (Details) - USD ($)	1 Months Ended
LONG-TERM DEBT - Promissory Notes (Details) - USD ($)	Mar. 31, 2012	Sep. 30, 2009	Jun. 30, 2015	Sep. 30, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Accrued interest payable			$ 28,718,000	$ 8,659,000
Mohegan Tribe Promissory Note, 2009 \| Promissory Notes
Debt Instrument [Line Items]
Loan face amount		$ 10,000,000.0
Note stated interest rate		10.00%
Quarterly interest payment		$ 1,200,000
Accrued interest payable			1,300,000	2,500,000
Mohegan Tribe Promissory Note, 2009 \| Promissory Notes \| Commencing December 31, 2012 through September 30, 2013
Debt Instrument [Line Items]
Quarterly amortization of principal		1,625,000.000
Mohegan Tribe Promissory Note, 2009 \| Promissory Notes \| Commencing December 31, 2013
Debt Instrument [Line Items]
Quarterly amortization of principal		875,000
Mohegan Tribe Promissory Note, 2009 \| Promissory Notes \| Commencing June 30, 2015
Debt Instrument [Line Items]
Periodic payment, interest		1,300,000
Quarterly amortization of principal		875,000
Mohegan Tribe Promissory Note, 2009 \| Promissory Notes \| Commencing September 30, 2015
Debt Instrument [Line Items]
Quarterly amortization of principal		$ 875,000
Mohegan Tribe Minor's Trust Promissory Note, 2012 \| Promissory Notes
Debt Instrument [Line Items]
Loan face amount	$ 20,000,000.0
Note stated interest rate	10.00%
Accrued interest payable			1,700,000	416,000
Mohegan Tribe Minor's Trust Promissory Note, 2012 \| Promissory Notes \| Commencing September 30, 2015 through March 31, 2016
Debt Instrument [Line Items]
Periodic payment, interest	$ 800,000
Mohegan Tribe Minor's Trust Promissory Note, 2012 \| Promissory Notes \| Commencing December 31, 2012 through March 31, 2014
Debt Instrument [Line Items]
Quarterly amortization of principal	500,000
Mohegan Tribe Minor's Trust Promissory Note, 2012 \| Promissory Notes \| Commencing December 31, 2012 through September 30, 2014
Debt Instrument [Line Items]
Quarterly amortization of principal	500,000
Mohegan Tribe Minor's Trust Promissory Note, 2012 \| Promissory Notes \| Commencing December 31, 2014 to Maturity
Debt Instrument [Line Items]
Quarterly amortization of principal	1,500,000.0
Mohegan Tribe Minor's Trust Promissory Note, 2012 \| Promissory Notes \| Commencing March 31, 2017
Debt Instrument [Line Items]
Quarterly amortization of principal	$ 10,000,000
2013 Mohegan Tribe Promissory Note \| Promissory Notes
Debt Instrument [Line Items]
Loan face amount					$ 7,400,000.0
Note stated interest rate					4.00%
Accrued interest payable			$ 1,000	$ 1,000