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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
Kramer Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information	$ 25
Number of stores acquired	20
Number of heavy truck stores acquired	2
Number of wholesale operations acquired	2
Number of retread facilities acquired	1
Number of heavy truck stores disposed	2
Colony Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information	25
Number of stores acquired	18
Tuffy Acquisition
Business Acquisition [Line Items]
Annual sales based on unaudited pre-acquisition historical information	9
Number of stores acquired	17
Fiscal Year 2013 Closed Acquisitions [Member]
Business Acquisition [Line Items]
Total purchase price of completed acquisitions	$ 51

X

- Definition

The number of heavy truck tire and truck repair stores acquired by the entity during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Number of heavy truck stores disposed.

+ References

No definition available.

+ Details

Name:	mnro_Numberofheavytruckstoresdisposed
Namespace Prefix:	mnro_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of retread facilities acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	mnro_Numberofretreadfacilitiesacquired
Namespace Prefix:	mnro_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	mnro_Numberofstoresacquired
Namespace Prefix:	mnro_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of wholesale operations acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	mnro_Numberofwholesaleoperationsacquired
Namespace Prefix:	mnro_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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.

+ References

No definition available.

+ Details

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