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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
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Mar. 28, 2015
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Mar. 29, 2014
Mar. 31, 1995
acre
Debt Instrument [Line Items]          
Revolving credit facility agreement $ 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 175,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity      
Credit Facility Increased Availability 75,000,000mnro_LineOfCreditFacilityIncreaseDecreaseBorrowingCapacity 75,000,000mnro_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   7mnro_LineOfCreditFacilityNumberOfBanks 6mnro_LineOfCreditFacilityNumberOfBanks    
Debt Instrument, Maturity Date     Dec. 01, 2017    
Provision allowing to expand the amount of overall facility 75,000,000mnro_ProvisionAllowingCreditFacilityExpansion        
Revolving Credit Facility, LIBOR-based     122,543,000us-gaap_LineOfCredit [1] 105,841,000us-gaap_LineOfCredit [1]  
Line of credit sub-facility for issuing standby letters of credit     40,000,000us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases    
Percentage of face amount of standby letter of credit payable as fees     1.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage    
Letters of credit outstanding     23,700,000us-gaap_LettersOfCreditOutstandingAmount    
Net availability under the credit facility     103,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity    
Carrying amount of long-term debt (including current portion)     122,543,000us-gaap_LongTermDebt 105,841,000us-gaap_LongTermDebt  
Fair value of long-term debt (including current portion)     122,500,000us-gaap_LongTermDebtFairValue 106,500,000us-gaap_LongTermDebtFairValue  
The total amount financed for properties with capital leases and financing obligations     142,100,000mnro_AdditionalFinancingForPropertiesWithCapitalLeases    
Acres of land purchased         12.7mnro_AcresOfLandPurchased
Purchase price of land purchased         $ 700,000mnro_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%.