Issuance Price Percentage of the Debt Instrument

No definition available.

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Namespace Prefix:	mtor_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 942
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Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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LONG-TERM DEBT - 6.25 Percent Notes (Details) - USD ($)			12 Months Ended
LONG-TERM DEBT - 6.25 Percent Notes (Details) - USD ($)	Jun. 11, 2015	Feb. 13, 2014	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 22, 2017	Dec. 31, 2012
Debt Instrument [Line Items]
Proceeds from debt issuance			$ 0	$ 0	$ 325,000,000
6.25% notes due 2024
Debt Instrument [Line Items]
Stated interest rate			6.25%
Proceeds from debt issuance		$ 225,000,000
Senior Notes \| 6.25% notes due 2024
Debt Instrument [Line Items]
Stated interest rate			6.25%
Debt instrument, face amount		$ 225,000,000
Debt term		10 years
Issuance price of principle		10000.00%
Debt			$ 444,000,000	444,000,000
Redemption price percentage			100.00%
Senior Notes \| 6.25% notes due 2024 \| Redemption period one
Debt Instrument [Line Items]
Redemption price percentage			103.125%
Senior Notes \| 6.25% notes due 2024 \| Redemption period two
Debt Instrument [Line Items]
Redemption price percentage			102.083%
Senior Notes \| 6.25% notes due 2024 \| Redemption period three
Debt Instrument [Line Items]
Redemption price percentage			101.042%
Senior Notes \| 6.25% notes due 2024 \| Redemption period four
Debt Instrument [Line Items]
Redemption price percentage			100.00%
Senior Notes \| 6.25% notes due 2024 \| Change in control
Debt Instrument [Line Items]
Redemption price percentage			101.00%
Senior Notes \| 10.625% notes due 2018
Debt Instrument [Line Items]
Stated interest rate		1062.50%
Repurchased principal amount of debt		$ 250,000,000
Promissory Notes \| 6.25% notes due 2024
Debt Instrument [Line Items]
Debt instrument, face amount	$ 225,000,000	$ 225,000,000
Debt	450,000,000
Convertible Notes \| 7.875% convertible notes due 2026
Debt Instrument [Line Items]
Stated interest rate			7.875%
Debt instrument, face amount							$ 250,000,000
Repurchased principal amount of debt	110,000,000
Repayments of convertible debt	$ 179,000,000
Debt			$ 23,000,000	$ 22,000,000		$ 140,000,000