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Long-Term Debt (Details Textual 1)	12 Months Ended
	Mar. 31, 2012
Line of Credit Facility [Line Items]
Interest rate over LIBOR on the facility	1.00%
Maximum [Member]
Line of Credit Facility [Line Items]
Interest rate over LIBOR on the facility	1.00%
Percentage of net income permit as cash dividend, maximum	50.00%
Minimum [Member]
Line of Credit Facility [Line Items]
Interest rate over LIBOR on the facility	0.50%

X

- Definition

The maximum allowed percentage of the preceding year's net income permitted to be paid as a cash dividend.

+ References

No definition available.

+ Details

Name:	mnro_LineOfCreditFacilityDividend
Namespace Prefix:	mnro_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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