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Long-Term Debt, Capital Leases And Financing Obligations (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Jun. 30, 2011 item | Mar. 28, 2015 item | Mar. 29, 2014 | Mar. 31, 1995 acre
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility agreement | $ 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | $ 175,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |  |
Credit Facility Increased Availability | 75,000,000 mnro_LineOfCreditFacilityIncreaseDecreaseBorrowingCapacity | 75,000,000 mnro_LineOfCreditFacilityIncreaseDecreaseBorrowingCapacity |  |  |  |  |
Interest rate over LIBOR on the facility |  |  | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 |  | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 |  |
Revolving credit facility agreement term |  | 5 years |  |  |  |  |
Revolving credit facility agreement, number of participating banks |  | 7 mnro_LineOfCreditFacilityNumberOfBanks | 6 mnro_LineOfCreditFacilityNumberOfBanks |  |  |  |
Debt Instrument, Maturity Date |  |  | Dec. 01, 2017 |  |  |  |
Provision allowing to expand the amount of overall facility | 75,000,000 mnro_ProvisionAllowingCreditFacilityExpansion |  |  |  |  |  |
Revolving Credit Facility, LIBOR-based |  |  | 122,543,000 us-gaap_LineOfCredit | [1] | 105,841,000 us-gaap_LineOfCredit | [1] |
Line of credit sub-facility for issuing standby letters of credit |  |  | 40,000,000 us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases |  |  |  |
Percentage of face amount of standby letter of credit payable as fees |  |  | 1.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage |  |  |  |
Letters of credit outstanding |  |  | 23,700,000 us-gaap_LettersOfCreditOutstandingAmount |  |  |  |
Net availability under the credit facility |  |  | 103,800,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  |  |  |
Carrying amount of long-term debt (including current portion) |  |  | 122,543,000 us-gaap_LongTermDebt |  | 105,841,000 us-gaap_LongTermDebt |  |
Fair value of long-term debt (including current portion) |  |  | 122,500,000 us-gaap_LongTermDebtFairValue |  | 106,500,000 us-gaap_LongTermDebtFairValue |  |
The total amount financed for properties with capital leases and financing obligations |  |  | 142,100,000 mnro_AdditionalFinancingForPropertiesWithCapitalLeases |  |  |  |
Acres of land purchased |  |  |  |  |  |  | 12.7 mnro_AcresOfLandPurchased
Purchase price of land purchased |  |  |  |  |  |  | $ 700,000 mnro_AmountOfLandPurchased
Percentage of land purchased via a non-interest mortgage |  |  |  |  |  |  | 100.00%mnro_PercentageOfLandFinancedWithNonInterestMortgage
Period of non-interest bearing mortgage |  |  |  |  |  |  | 20 years
Term extension of credit facility | 1 year 6 months |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of net income permit as cash dividend, maximum |  |  | 50.00%mnro_LineOfCreditFacilityDividend / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
[1] | The London Interbank Offered Rate (LIBOR) at March 28, 2015 was .18%.

X
- Definition Acres of land purchased by the Company on which its office/warehouse facility is located. + References No definition available. + Details
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Namespace Prefix: | mnro_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount financed for properties with capital leases and financing obligations. + References No definition available. + Details
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Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of land purchased by the Company on which its office/warehouse facility is located. + References No definition available. + Details
Name: | mnro_AmountOfLandPurchased
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Name: | mnro_LineOfCreditFacilityDividend
Namespace Prefix: | mnro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Revolving credit facility agreement, number of participating banks. + References No definition available. + Details
Name: | mnro_LineOfCreditFacilityNumberOfBanks
Namespace Prefix: | mnro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of cost of land on which the Company's office/warehouse facility is located financed via a non-interest bearing mortgage. + References No definition available. + Details
Name: | mnro_PercentageOfLandFinancedWithNonInterestMortgage
Namespace Prefix: | mnro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of non-interest bearing mortgage. + References No definition available. + Details
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Namespace Prefix: | mnro_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Accordion feature of credit facility permitting additional increase in availability. + References No definition available. + Details
Name: | mnro_ProvisionAllowingCreditFacilityExpansion
Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revolving credit facility agreement term. + References No definition available. + Details
Name: | mnro_RevolvingCreditFacilityPeriod
Namespace Prefix: | mnro_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years that the Credit Facility was extended. + References No definition available. + Details
Name: | mnro_Termextensionofcreditfacility
Namespace Prefix: | mnro_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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