Advertising expenses amortization period.

No definition available.

Name:	mnro_AdvertisingExpensesAmortizationPeriod
Namespace Prefix:	mnro_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the income tax benefit from the expense recognized during the period arising from equity based compensation arrangements.

+ References

No definition available.

+ Details

Name:	mnro_IncomeTaxBenefitFromStockBasedCompensationExpense
Namespace Prefix:	mnro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the number of dealer operated automotive repair centers.

+ References

No definition available.

+ Details

Name:	mnro_NumberOfDealerOperatedAutomotiveRepairCenters
Namespace Prefix:	mnro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of franchised stores.

+ References

No definition available.

+ Details

Name:	mnro_NumberOfFranchisedStores
Namespace Prefix:	mnro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

For net share settlement of share based awards when the employee surrenders shares of stock, this element represents the number of stock options exercised by the employee in settlement of the surrender of shares.

+ References

No definition available.

+ Details

Name:	mnro_NumberOfStockOptionsExercisedFromSharesSurrendered
Namespace Prefix:	mnro_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

For net share settlement of share-based awards when the employee surrenders shares of stock, this element represents the number of shares surrendered by the employee in settlement of the exercise price and tax withholding obligations on the exercise of stock options.

+ References

No definition available.

+ Details

Name:	mnro_SharesOfStockSurrenderedInStockOptionsExercised
Namespace Prefix:	mnro_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Reporting Unit

-URI http://asc.fasb.org/extlink&oid=6523643

+ Details

Name:	us-gaap_NumberOfReportingUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of stores.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStores
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 28, 2015 segment item state store	Mar. 29, 2014	Mar. 30, 2013
Property, Plant and Equipment [Line Items]
Company operated stores	999us-gaap_NumberOfStores
Franchised locations	1mnro_NumberOfFranchisedStores
Dealer-operated automotive repair centers	14
Number of States in which Entity Operates	25
Number of operating segments	1us-gaap_NumberOfOperatingSegments
Number of reporting units	1us-gaap_NumberOfReportingUnits
Number of shares surrendered in settlement of stock options exercised	77,000		43,000
Number of stock options exercised in settlement of surrendered shares	113,000		113,000
Options award vesting period	4 years
Weighted average fair value of options granted	$ 11.27	$ 10.10	$ 8.67
Stock based compensation expense	$ 3.3	$ 3.6	$ 3.1
Income tax benefit related to stock based compensation	$ 1.2	$ 1.3	$ 1.2
Advertising expenses amortization period	2 months
Employee Stock Option [Member]
Property, Plant and Equipment [Line Items]
Options award vesting period	4 years
Buildings and Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	39 years
Buildings and Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	10 years
Machinery, Fixtures And Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	15 years
Machinery, Fixtures And Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	5 years
Vehicles [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	10 years
Vehicles [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	4 years
Computer Hardware And Software [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	7 years
Computer Hardware And Software [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	3 years