Name:	mnro_AcquisitionsTextualAbstract
Namespace Prefix:	mnro_
Data Type:	xbrli:stringItemType
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Represents the number of acquisition transactions.

+ References

No definition available.

+ Details

Name:	mnro_NumberOfAcquisitionTransactions
Namespace Prefix:	mnro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	mnro_NumberOfHeavyTruckStoresAcquired
Namespace Prefix:	mnro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of heavy truck stores disposed.

+ References

No definition available.

+ Details

Name:	mnro_NumberOfHeavyTruckStoresDisposed
Namespace Prefix:	mnro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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:integerItemType
Balance Type:	na
Period Type:	duration

- 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:integerItemType
Balance Type:	na
Period Type:	duration

- 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:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(3)

-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 Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph r(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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

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

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Acquisitions (Details Textual) (USD $)	12 Months Ended		12 Months Ended				12 Months Ended		3 Months Ended	12 Months Ended				1 Months Ended	3 Months Ended	1 Months Ended
Acquisitions (Details Textual) (USD $)	Mar. 31, 2012	Apr. 30, 2012	Mar. 26, 2011 Customer lists [Member] Y	Mar. 26, 2011 Non-compete Agreements [Member] Y	Mar. 26, 2011 Refuse Disposal Agreement [Member] Y	Mar. 26, 2011 Lease Agreements [Member]	Mar. 26, 2011 Lease Agreements [Member] Maximum [Member] Y	Mar. 26, 2011 Lease Agreements [Member] Minimum [Member] Y	Dec. 24, 2011 Ohio, Pennsylvania, and Maine [Member] Store Acquisition	Mar. 26, 2011 Maine, Pennsylvania and Virginia [Member] Store Acquisition Y	Mar. 26, 2011 Maine, Pennsylvania and Virginia [Member] Mr. Tire brand name [Member] Store	Mar. 26, 2011 Maine, Pennsylvania and Virginia [Member] Monro brand name [Member] Store	Mar. 26, 2011 Maine, Pennsylvania and Virginia [Member] Tire Warehouse brand name [Member] Store	Jun. 30, 2012 Colony [Member] Store	Jun. 25, 2011 Vespia [Member] Store	Apr. 30, 2012 Kramer [Member] WholesaleOperation Store RetreadFacilties
Acquisitions (Textual) [Abstract]
Value of intangible assets			$ 648,000	$ 345,000	$ 130,000	$ 654,000
Weighted average useful lives			4	4	5		20	5		7
Number of stores acquired									8	10	8	1	1	18	24	20
Number of heavy truck tire and truck repair stores acquired																2
Number of wholesale operations acquired																2
Number of acquisition transactions									2	3
Number of retread facilities acquired																1
Number of heavy truck tire and truck repair stores disposed																2
Annual sales based on unaudited pre-acquisition historical information									11,000,000	16,300,000				25,000,000	36,000,000	25,000,000
Total purchase price of stores		50,000,000								10,200,000
Sales of acquired entities for the reporting period from acquisition date	31,300,000									10,300,000
Net income of acquired entities for the reporting period from acquisition date	$ 1,000,000									$ 600,000