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v3.21.2

Description Of Business And Basis Of Presentation (Narrative) (Details) | Jun. 26, 2021 item store state
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Description Of Business And Basis Of Presentation [Abstract] |
Company operated retail stores | store | 1,291
Number of states in which entity operates | state | 32
Number of franchised locations | item | 91

X
- Definition Represents the number of franchised stores. + References No definition available. + Details
Name: | mnro_NumberOfFranchisedStores
Namespace Prefix: | mnro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant