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Significant Accounting Policies (Leases, Goodwill And Intangible Assets Narrative) (Details) (USD $)	9 Months Ended	12 Months Ended
	Dec. 27, 2014	Mar. 30, 2013
Significant Accounting Policies [Abstract]
Property, plant and equipment- financing obligations		$ 400,000mnro_PropertyPlantAndEquipmentFinancingObligationsAdjustmentCurrentPeriod
Capital leases and financing obligations-financing obligation		700,000mnro_CaptialLeasesAndFinancingObligationsFinancingObligationsAdjustmentCurrentPeriod
Goodwill-financing obligation		1,900,000mnro_GoodwillFinancingObligationsAdjustmentCurrentPeriod
Deferred income taxes-financing obligation		1,200,000mnro_DeferredIncomeTaxAssetsFinancingObligationAdjustmentCurrentPeriod
Other long-term liabilities-financing obligation		2,300,000mnro_OtherLongTermLiabilitiesFinancingObligationsAdjustmentCurrentPeriod
Occupancy costs-financing obligation		(1,000,000)mnro_OccupancyCostsFinancingObligationsAdjustmentCurrentPeriod
Interest expense-financing obligations		500,000mnro_InterestExpenseFinancingObligationsAdjustmentCurrentPeriod
Impairment of intangible assets	$ 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived

X

- Definition

Adjustment to captial leases and financing obligations in connection with the financing obligation adjustment during the period.

+ References

No definition available.

+ Details

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X

- Definition

Adjustment to deferred income tax assets in connection with the financing obligation adjustment during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mnro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Adjustment to goodwill in connection with the financing obligation adjustment during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mnro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Adjustment to interest expense in connection with the financing obligation adjustment during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mnro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Adjustment to occupancy costs in connection with the financing obligation adjustment during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mnro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Adjustment to other long-term liabilitiies in connection with the financing obligation adjustment during the period.

+ References

No definition available.

+ Details

Name:	mnro_OtherLongTermLiabilitiesFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix:	mnro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Adjustment to property, plant and equipment in connection with the financing obligation adjustment during the period.

+ References

No definition available.

+ Details

Name:	mnro_PropertyPlantAndEquipmentFinancingObligationsAdjustmentCurrentPeriod
Namespace Prefix:	mnro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Balance Type:	na
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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

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