Debt Instrument, Covenant, Collateral Test, Maximum Ratio

No definition available.

Name:	mtor_DebtInstrumentCovenantCollateralTestMaximumRatio
Namespace Prefix:	mtor_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum Limit on the issuance of letters of credit.

+ References

No definition available.

+ Details

Name:	mtor_MaximumLimitOnIssuanceOfLettersOfCredit
Namespace Prefix:	mtor_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio of Total Priority Debt (consisting principally of amounts outstanding under revolving credit facility, U.S. accounts receivable securitization and factoring programs, and third-party non-working capital foreign debt) to EBITDA Through Period End

+ References

No definition available.

+ Details

Name:	mtor_RatioofTotalPriorityDebttoEBITDAThroughPeriodEnd
Namespace Prefix:	mtor_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Value as of the reporting date of Company's assets collateralized for borrowings under the revolving credit facility.

+ References

No definition available.

+ Details

Name:	mtor_ValueOfCompanyAssetsCollateralized
Namespace Prefix:	mtor_
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

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

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-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=6876686&loc=d3e534808-122878

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

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

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=mtor_RevolvingCreditFacilityAmendedMaturesInFebruary2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mtor_RevolvingCreditFacilityAmendedMaturesInApril2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mtor_TriggeringEventAxis=mtor_TriggeringEventOneMember
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_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

LONG-TERM DEBT (Revolving Credit Facility) (Details)	12 Months Ended
LONG-TERM DEBT (Revolving Credit Facility) (Details)	Sep. 30, 2015 USD ($)	May. 22, 2015 USD ($)	Feb. 13, 2015 USD ($)	Sep. 30, 2014 USD ($)
Debt Instrument [Line Items]
Amount outstanding, letters of credit				$ 9,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 499,000,000
Unused capacity, commitment fee percentage	0.50%
Amount outstanding	$ 0			0
Amount outstanding, letters of credit	$ 0			$ 0
Revolving Credit Facility \| Amended Revolving Credit Facility
Debt Instrument [Line Items]
Collateral maximum test value	1.0
Value of company assets collateralized	$ 636,000,000
Maximum limit on issuance of letters of credit	$ 100,000,000
Revolving Credit Facility \| Revolving Credit Facility - Amended - Matures In February 2019
Debt Instrument [Line Items]
Maximum borrowing capacity		459,000,000	$ 410,000,000
Revolving Credit Facility \| Revolving Credit Facility - Amended - Matures In April 2017
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 40,000,000	$ 89,000,000
Revolving Credit Facility \| Triggering Event One
Debt Instrument [Line Items]
Required ratio of total priority debt to EBITDA through period end	2.25
Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.25%
Revolving Credit Facility \| Prime Rate \| Overnight Revolving Credit Loans
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%