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Condensed Consolidated Financial Statements (Details) (USD $)	Sep. 24, 2011
Organization Consolidation And Presentation Of Financial Statements Disclosure [Abstract]
Property, plant and equipment, purchase price adjustment	$ 1,331,000
Deferred income tax asset, purchase price adjustment	381,000
Goodwill, purchase price adjustment	325,000
Intangible assets, purchase price adjustment	297,000
Long-term debt, purchase price adjustment	$ 2,334,000

X

- Definition

Amount of deferred tax asset adjustment during reporting period from June 5, 2011 acquisition.

+ Details

Name:	mnro_DeferredTaxAssetPurchasePriceAdjustment
Namespace Prefix:	mnro
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of fixed assets adjustment during reporting period from June 5, 2011 acquisition.

+ Details

Name:	mnro_FixedAssetsPurchasePriceAdjustment
Namespace Prefix:	mnro
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of goodwill adjustment during reporting period from June 5, 2011acquisition.

+ Details

Name:	mnro_GoodwillPurchasePriceAdjustment
Namespace Prefix:	mnro
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of deferred tax asset adjustment during reporting period from June 5, 2011 acquisition.

+ Details

Name:	mnro_IntangibleAssetsPurchasePriceAdjustment
Namespace Prefix:	mnro
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of long-term debt adjustment during reporting period from June 5, 2011 acquisition.

+ Details

Name:	mnro_LongTermDebtPurchasePriceAdjustment
Namespace Prefix:	mnro
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	mnro
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration