XML 22 R19.htm IDEA: XBRL DOCUMENT  v2.3.0.11

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

X

- Definition

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

+ Details

Name:	mnro_NumberOfStoresAcquired
Namespace Prefix:	mnro
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
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.

+ Details

Name:	us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration