Debt instrument maturity year.

No definition available.

Name:	ck1005276_DebtInstrumentMaturityYear
Namespace Prefix:	ck1005276_
Data Type:	us-types:gYearListItemType
Balance Type:	na
Period Type:	duration

- Definition

Extension fee agreed to pay to lenders basis points.

+ References

No definition available.

+ Details

Name:	ck1005276_ExtensionFeeAgreedToPayToLendersBasisPoints
Namespace Prefix:	ck1005276_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Increase in applicable margin to pricing level four basis points.

+ References

No definition available.

+ Details

Name:	ck1005276_IncreaseInApplicableMarginToPricingLevelFourBasisPoints
Namespace Prefix:	ck1005276_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Increase in applicable margin to pricing level three basis points.

+ References

No definition available.

+ Details

Name:	ck1005276_IncreaseInApplicableMarginToPricingLevelThreeBasisPoints
Namespace Prefix:	ck1005276_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum liquidity requirement.

+ References

No definition available.

+ Details

Name:	ck1005276_MinimumLiquidityRequirement
Namespace Prefix:	ck1005276_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Operating lease commencement date.

+ References

No definition available.

+ Details

Name:	ck1005276_OperatingLeaseCommencementDate
Namespace Prefix:	ck1005276_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Subordinated borrowing bearing interest-in-kind, percentage rate.

+ References

No definition available.

+ Details

Name:	ck1005276_SubordinatedBorrowingBearingInterestInKindPercentageRate
Namespace Prefix:	ck1005276_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Waiver period extended date.

+ References

No definition available.

+ Details

Name:	ck1005276_WaiverPeriodExtendedDate
Namespace Prefix:	ck1005276_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Waiver threshold consecutive period.

+ References

No definition available.

+ Details

Name:	ck1005276_WaiverThresholdConsecutivePeriod
Namespace Prefix:	ck1005276_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

+ Details

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

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Sum of investments and unrestricted cash as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1,2)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

+ Details

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

- Definition

Total contributions made by each class of partners (i.e., general, limited and preferred partners).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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

- Definition

Date the payments are due on subordinated debt, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_SubordinatedBorrowingDueDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ck1005276_FourthAmendmentToCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ck1005276_MoheganTribeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ck1005276_MGENiagaraResortsCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=ck1005276_InitialWaiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=ck1005276_SecondWaiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=ck1005276_ThirdWaiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ck1005276_SeniorSecuredCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ck1005276_LondonInterbankOfferedRateLIBORFloorRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=ck1005276_TermLoanAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=ck1005276_TermLoanBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ck1005276_MGENiagaraMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Additional Information (Details) $ in Millions					3 Months Ended	6 Months Ended
	Aug. 28, 2020 USD ($)	Aug. 24, 2020 USD ($)	Jul. 31, 2020 USD ($)	May 15, 2020	Jun. 30, 2020	Mar. 31, 2020 USD ($)	Mar. 31, 2020 CAD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)
Subsequent Event [Line Items]
Payments on operating lease obligations						$ 16,434,000
Cash and cash equivalents						$ 184,868,000		$ 130,138,000	$ 91,396,000
Subsequent Event \| Fourth Amendment \| Mohegan Tribe
Subsequent Event [Line Items]
Cash investment		$ 20,000,000
Contribution amount		15,000,000
Subordinated loan		$ 5,000,000
Subordinated loan, maturity date		Oct. 16, 2024
Subordinated loan, interest in-kind, percentage		10.00%
Subsequent Event \| MGE Niagara Resorts Credit Facilities \| Initial Waiver
Subsequent Event [Line Items]
Waiver consecutive days				60 days
Extended waiver period				Jun. 15, 2020
Subsequent Event \| MGE Niagara Resorts Credit Facilities \| Second Waiver
Subsequent Event [Line Items]
Extended waiver period					Jul. 31, 2020
Basis point increase over pricing level 3					50
Subsequent Event \| MGE Niagara Resorts Credit Facilities \| Third Waiver
Subsequent Event [Line Items]
Extended waiver period			Sep. 30, 2020
Basis points over pricing level 4			100
Minimum liquidity requirement			$ 15,000,000
Extension fee agreed to pay to lenders basis points			10
Senior Secured Credit Facilities \| Subsequent Event \| Fourth Amendment
Subsequent Event [Line Items]
Debt instrument, covenant description	Pursuant to the Fourth Amendment, the Company will, during the period beginning on August 28, 2020, and ending upon achievement of certain financial ratios specified in the Fourth Amendment (such period, the “Financial Covenant Restricted Period”), be subject to, among other things, (i) a minimum liquidity covenant that requires cash and cash equivalents and availability under its revolving credit facility to be at least $70 million as of the last day of each calendar month, (ii) a covenant that requires the Company be in pro forma compliance with such liquidity covenant in order to make any interest payment on the Company’s 7.875% Senior Notes due 2024, and (iii) certain additional reporting covenants.
Debt instrument interest rate	7.875%
Debt instrument maturity year	2024
Senior Secured Credit Facilities \| Subsequent Event \| Fourth Amendment \| Revolving Credit Facility \| LIBOR Floor
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate		0.75%
Senior Secured Credit Facilities \| Subsequent Event \| Fourth Amendment \| Revolving Credit Facility \| Minimum
Subsequent Event [Line Items]
Cash and cash equivalents	$ 70,000,000
Senior Secured Credit Facilities \| Subsequent Event \| Fourth Amendment \| Term Loan A \| Adjusted LIBOR Rate
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate		6.125%
Senior Secured Credit Facilities \| Subsequent Event \| Fourth Amendment \| Term Loan A \| Base Rate
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate		5.125%
Senior Secured Credit Facilities \| Subsequent Event \| Fourth Amendment \| Term Loan A \| LIBOR Floor
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate		1.00%
Senior Secured Credit Facilities \| Subsequent Event \| Fourth Amendment \| Term Loan B \| Adjusted LIBOR Rate
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate		6.375%
Senior Secured Credit Facilities \| Subsequent Event \| Fourth Amendment \| Term Loan B \| Base Rate
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate		5.375%
MGE Niagara
Subsequent Event [Line Items]
Operating lease commencement date						Aug. 19, 2020	Aug. 19, 2020
Payments on operating lease obligations						$ 600,000	$ 0.9
Operating lease expiration date						Mar. 31, 2040	Mar. 31, 2040