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Long-Term Debt, Capital Leases And Financing Obligations (Narrative) (Details)		12 Months Ended
		Mar. 25, 2017 USD ($) entity	Mar. 26, 2016 USD ($)
Debt Instrument [Line Items]
Net availability under the credit facility		$ 391,200,000
Carrying amount of long-term debt (including current portion)		182,400,000	$ 103,300,000
Fair value of long-term debt (including current portion)		182,400,000	103,300,000
The total amount financed for properties with capital leases and financing obligations		228,400,000
Note payable, non-interest bearing, due in equal installments through September 2019		60,000
Revolving Credit Facility, January 2016 [Member]
Debt Instrument [Line Items]
Revolving credit facility agreement		600,000,000
Credit Facility Increased Availability		$ 350,000,000
Revolving credit facility agreement term		5 years
Revolving credit facility agreement, number of participating banks | entity		9
Provision allowing to expand the amount of overall facility		$ 100,000,000
Credit facility, Change in increased availability		25,000,000
Amount outstanding under Credit Facility	[1]	$ 182,297,000	$ 103,315,000
Revolving Credit Facility, January 2016 [Member] | Scenario, Actual [Member]
Debt Instrument [Line Items]
Interest rate over LIBOR on the facility		1.00%	1.00%
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit sub-facility for issuing standby letters of credit		$ 80,000,000
Letters of credit outstanding		$ 26,500,000
Minimum [Member] | Revolving Credit Facility, January 2016 [Member]
Debt Instrument [Line Items]
Interest rate over LIBOR on the facility		0.75%
Percentage of face amount of standby letter of credit payable as fees		0.15%
Minimum [Member] | Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Percentage of face amount of standby letter of credit payable as fees		0.875%
Maximum [Member]
Debt Instrument [Line Items]
Percentage of net income permit as cash dividend, maximum		50.00%
Maximum [Member] | Revolving Credit Facility, January 2016 [Member]
Debt Instrument [Line Items]
Interest rate over LIBOR on the facility		1.75%
Percentage of face amount of standby letter of credit payable as fees		0.35%
Maximum [Member] | Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Percentage of face amount of standby letter of credit payable as fees		1.875%
[1] The London Interbank Offered Rate (LIBOR) at March 25, 2017 was .98%.

X

- Definition

The total amount financed for properties with capital leases and financing obligations.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Line of credit facility, Change in potential increase in capacity

+ References

No definition available.

+ Details

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Namespace Prefix:	mnro_
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Period Type:	duration

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

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X

- Definition

Increase in borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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X

- Definition

Revolving credit facility agreement, number of participating banks.

+ References

No definition available.

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X

- Definition

Accordion feature of credit facility permitting additional increase in availability.

+ References

No definition available.

+ Details

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X

- Definition

Revolving credit facility agreement term.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

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- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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