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Significant Accounting Policies (Company's sales mix) (Details)	12 Months Ended
	Mar. 31, 2018	Mar. 25, 2017	Mar. 26, 2016
Company's sales mix
Revenue recognition	100.00%	100.00%	100.00%
Brakes [Member]
Company's sales mix
Revenue recognition	13.00%	13.00%	15.00%
Exhaust [Member]
Company's sales mix
Revenue recognition	2.00%	2.00%	3.00%
Steering [Member]
Company's sales mix
Revenue recognition	8.00%	9.00%	10.00%
Tires [Member]
Company's sales mix
Revenue recognition	50.00%	49.00%	45.00%
Maintenance [Member]
Company's sales mix
Revenue recognition	27.00%	27.00%	27.00%

X

- Definition

The percentage of net product revenue to total net revenue from the sale of goods as of year end.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_SalesRevenueGoodsNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=mnro_ExhaustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=mnro_SteeringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=mnro_TiresMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=mnro_MaintenanceMember
Namespace Prefix:
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Period Type: