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Cash Dividend (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Dividends to shareholders	$ 14,875	$ 14,848
First Amendment To Credit Facility [Member]
Debt instrument, Allowable dividend or distribution in next year	$ 38,500

X

- Definition

Debt instrument, Allowable dividend or distribution in next year

+ References

No definition available.

+ Details

Name:	mnro_DebtInstrumentAllowableDividendOrDistributionInNextYear
Namespace Prefix:	mnro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfDividends
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=mnro_FirstAmendmentToCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: