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Stock Ownership (Narrative) (Details) (USD $)	12 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 12, 2012
Common stock shares authorized	65,000,000us-gaap_CommonStockSharesAuthorized	65,000,000us-gaap_CommonStockSharesAuthorized
Class C convertible preferred stock, conversion value	$ 0.064mnro_PreferredStockConversionRate	$ 0.064mnro_PreferredStockConversionRate
Distribution amount per share of preferred stock on liquidation of company	$ 1.50mnro_DistributionAmountPerShareOfPreferredStockOnLiquidationOfCompany
Minimum percentage of preferred stock holders approval for authorization of action	60.00%mnro_MinimumPercentageOfPreferredStockHoldersApprovalForAuthorizationOfAction
Before Amendment [Member]
Common stock shares authorized			45,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementScenarioAxis = mnro_BeforeResolutionToAmendMember
After Amendment [Member]
Common stock shares authorized			65,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementScenarioAxis = mnro_AfterAmendmentMember

X

- Definition

Distribution amount per share of preferred stock on liquidation of company.

+ References

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X

- Definition

Minimum percentage of preferred stock holders approval for authorization of action.

+ References

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+ Details

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X

- Definition

The rate at which the preferred stock can be converted into common stock.

+ References

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+ Details

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X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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- Details

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