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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Jun. 25, 2011 June 5, 2011 Acquisition [Member]	Dec. 31, 2010 June 5, 2011 Acquisition [Member]	Dec. 24, 2011 Third Quarter Fiscal 2012 Acquisition [Member]	Dec. 31, 2010 Third Quarter Fiscal 2012 Acquisition [Member]
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information		$ 36		$ 11
Number of Stores Acquired (in Number of Stores)	24		8

X

- Definition

The number of stores acquired by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mnro_
Data Type:	xbrli:pureItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration