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Supplier Finance Program (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 24, 2023 | Mar. 25, 2023 | Jun. 25, 2022
Supplier Finance Program [Abstract] |  |  |
Payment terms, period | 360 days |  |
Outstanding supplier obligations | $ 194.9 | $ 167.3 | $ 42.3

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- Definition Supplier Finance Program, Obligation + References No definition available. + Details
Name: | mnro_SupplierFinanceProgramObligation
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Supplier Finance Program, Payment Timing, Period + References No definition available. + Details
Name: | mnro_SupplierFinanceProgramPaymentTimingPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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