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Related Party Transactions (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) item | Mar. 26, 2016 USD ($) item | Mar. 25, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |
Related party leases remaining | item | 6 |  |
New leases contemplated | item | 0 |  |
Operating and capital leases | $ 0.8 | $ 0.7 | $ 0.8
Financial and Strategic Advisory Services, Annual Fee |  | 0.3 |
Financial and Strategic Advisory Services Fee |  | $ 0.2 |
Number of unsuccessful acquisitions where advisory services fees were paid | item |  | 3 |
Acquisition Advisory Services [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Financial and Strategic Advisory Services Fee |  | $ 1.0 |

X
- Definition Number of new leases. + References No definition available. + Details
Name: | mnro_NumberOfNewLeases
Namespace Prefix: | mnro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of related party leases remaining. + References No definition available. + Details
Name: | mnro_NumberOfRelatedPartyLeasesRemaining
Namespace Prefix: | mnro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of unsuccessful acquisitions where advisory services fees were paid. + References No definition available. + Details
Name: | mnro_NumberOfUnsuccessfulAcquisitionsWhereAdvisoryServicesFeesWerePaid
Namespace Prefix: | mnro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating and capital lease payments made to a related party. + References No definition available. + Details
Name: | mnro_OperatingAndCapitalLeases
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Related Party, Investment Advisory, Annual Fee, Provided By Agreement + References No definition available. + Details
Name: | mnro_RelatedPartyInvestmentAdvisoryAnnualFeeProvidedByAgreement
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Advisory fees arising from transactions with related parties who are not affiliates or joint ventures. + References No definition available. + Details
Name: | mnro_RelatedPartyInvestmentAdvisoryFees
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=mnro_AcquisitionAdvisoryServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |