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Subsequent Events (Details)	1 Months Ended
	Nov. 06, 2018 store
Subsequent Event [Member] | Hurricane [Member]
Subsequent Event [Line Items]
Number of stores temporarily closed	10

X

- Definition

Number of stores that temporarily closed and have reopened.

+ References

No definition available.

+ Details

Name:	mnro_NumberOfStoresTemporarilyClosed
Namespace Prefix:	mnro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_HurricaneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: