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Significant Accounting Policies (Leases, Goodwill And Intangible Assets Narrative) (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 27, 2014 | Mar. 30, 2013
Significant Accounting Policies [Abstract] |  |
Property, plant and equipment- financing obligations |  | $ 400,000 mnro_PropertyPlantAndEquipmentFinancingObligationsAdjustmentCurrentPeriod
Capital leases and financing obligations-financing obligation |  | 700,000 mnro_CaptialLeasesAndFinancingObligationsFinancingObligationsAdjustmentCurrentPeriod
Goodwill-financing obligation |  | 1,900,000 mnro_GoodwillFinancingObligationsAdjustmentCurrentPeriod
Deferred income taxes-financing obligation |  | 1,200,000 mnro_DeferredIncomeTaxAssetsFinancingObligationAdjustmentCurrentPeriod
Other long-term liabilities-financing obligation |  | 2,300,000 mnro_OtherLongTermLiabilitiesFinancingObligationsAdjustmentCurrentPeriod
Occupancy costs-financing obligation |  | (1,000,000)mnro_OccupancyCostsFinancingObligationsAdjustmentCurrentPeriod
Interest expense-financing obligations |  | 500,000 mnro_InterestExpenseFinancingObligationsAdjustmentCurrentPeriod
Impairment of intangible assets | $ 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived |

X
- Definition Adjustment to captial leases and financing obligations in connection with the financing obligation adjustment during the period. + References No definition available. + Details
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X
- Definition Adjustment to deferred income tax assets in connection with the financing obligation adjustment during the period. + References No definition available. + Details
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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
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X
- Definition Adjustment to interest expense in connection with the financing obligation adjustment during the period. + References No definition available. + Details
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Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Adjustment to occupancy costs in connection with the financing obligation adjustment during the period. + References No definition available. + Details
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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

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- Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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