Significant Accounting Policies Leases (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Mar. 30, 2013
Deferred income taxes-financing obligation-current period	$ 1.2
Capital leases and financing obligations-financing Obligation-current period	0.7
Goodwill-financing obligation-current period	1.9
Other long-term liabilities-financing obligation-current period	2.3
Occupancy costs-financing obligation-current period	(1.0)
Interest expense-financing obligations-current period	0.5
Property, plant and equipment- financing obligations-current period	$ 0.4

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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

Adjustment to long-term deferred taxes in connection with the financing obligation adjustment during the period.

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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