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Earnings per Share (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended
Dec. 01, 2014
Dec. 02, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 01, 2014
Sep. 30, 2014
Nov. 07, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Impact of restricted shares, restricted share units and performance share units     1,900,000mtor_ImpactOfRestrictedSharesAndShareUnits 2,000,000mtor_ImpactOfRestrictedSharesAndShareUnits 2,000,000mtor_ImpactOfRestrictedSharesAndShareUnits 1,700,000mtor_ImpactOfRestrictedSharesAndShareUnits      
Impact of convertible notes     3,000,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 2,000,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities      
Performance Shares                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Share-based compensation expense           1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Restricted Shares, Restricted Share Units and Performance Shares                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Share-based compensation expense     3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mtor_RestrictedSharesRestrictedShareUnitsAndPerformanceSharesMember
1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mtor_RestrictedSharesRestrictedShareUnitsAndPerformanceSharesMember
5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mtor_RestrictedSharesRestrictedShareUnitsAndPerformanceSharesMember
       
Executive Officer [Member] | Performance Shares                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Number or shares issuable per performance share unit 1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
          1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
  1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
Exercise price $ 13.74us-gaap_DeferredCompensationArrangementWithIndividualExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
$ 7.97us-gaap_DeferredCompensationArrangementWithIndividualExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
             
Performance period       3 years 3 years        
Shares authorized for grant     600,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
  600,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
    1,800,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
 
Impact of convertible notes     1,000,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
600,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
800,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
300,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
     
Executive Officer [Member] | Performance Shares | Minimum                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Performance-based vesting percentage       0.00%mtor_DeferredCompensationArrangementWithIndividualVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
0.00%mtor_DeferredCompensationArrangementWithIndividualVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
       
Executive Officer [Member] | Performance Shares | Maximum                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Performance-based vesting percentage       200.00%mtor_DeferredCompensationArrangementWithIndividualVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
200.00%mtor_DeferredCompensationArrangementWithIndividualVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
       
Executive Officer [Member] | Performance Shares | Performance Objective One                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Award vesting rights percentage       50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
       
Executive Officer [Member] | Performance Shares | Performance Objective Two                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Award vesting rights percentage       25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
       
Executive Officer [Member] | Performance Shares | Performance Objective Three                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Award vesting rights percentage       25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember
         
Executive Officer [Member] | Restricted Share Units (RSUs)                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Exercise price $ 13.74us-gaap_DeferredCompensationArrangementWithIndividualExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
               
Shares granted 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
               
Vesting period 3 years                
Stock Options, Out-of-the-Money                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Antidilutive shares excluded from computation of earnings per share       800,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= mtor_EmployeeStockOptionOutOfTheMoneyMember
         
7.875% Convertible Notes Due 2026 | Convertible Notes Payable                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Interest rate     7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtor_SevenAndSevenEighthsPercentConvertibleNotesDue2026Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
  7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtor_SevenAndSevenEighthsPercentConvertibleNotesDue2026Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
    7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mtor_SevenAndSevenEighthsPercentConvertibleNotesDue2026Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember