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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

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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: