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Commitments and Contingencies (Narrative) (Details) $ in Millions | 3 Months Ended
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Jun. 26, 2021 USD ($)
Mark Cerini [Member] | Settled Litigation [Member] |
Potential settlement amount included in OSG&A expenses | $ 3.9

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_LitigationCaseAxis=mnro_MarkCeriniMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationStatusAxis=us-gaap_SettledLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |