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Significant Accounting Policies Leases (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 30, 2013
Deferred income taxes-financing obligation-current period | $ 1.2
Capital leases and financing obligations-financing Obligation-current period | 0.7
Goodwill-financing obligation-current period | 1.9
Other long-term liabilities-financing obligation-current period | 2.3
Occupancy costs-financing obligation-current period | (1.0)
Interest expense-financing obligations-current period | 0.5
Property, plant and equipment- financing obligations-current period | $ 0.4

X
- Definition Adjustment to captial leases and financing obligations in connection with the financing obligation adjustment during the period. + References No definition available. + Details
Name: | mnro_CaptialLeasesAndFinancingObligationsFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Adjustment to goodwill in connection with the financing obligation adjustment during the period. + References No definition available. + Details
Name: | mnro_GoodwillFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Adjustment to interest expense in connection with the financing obligation adjustment during the period. + References No definition available. + Details
Name: | mnro_InterestExpenseFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustment to long-term deferred taxes in connection with the financing obligation adjustment during the period. + References No definition available. + Details
Name: | mnro_LongTermDeferredTaxesFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Adjustment to occupancy costs in connection with the financing obligation adjustment during the period. + References No definition available. + Details
Name: | mnro_OccupancyCostsFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustment to other long-term liabilitiies in connection with the financing obligation adjustment during the period. + References No definition available. + Details
Name: | mnro_OtherLongTermLiabilitiesFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Adjustment to property, plant and equipment in connection with the financing obligation adjustment during the period. + References No definition available. + Details
Name: | mnro_PropertyPlantAndEquipmentFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant