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Related Party Transactions (Details) (USD $)
 1 Months Ended 12 Months Ended
Mar. 31, 2015
item
Mar. 31, 2004
item
Mar. 28, 2015
item
Mar. 29, 2014
Mar. 30, 2013
Related Party Transactions [Abstract]          
Related party leases assumed   6mnro_NumberOfRelatedPartyLeasesAssumed      
Related party leases assumed and acquired 1mnro_NumberOfRelatedPartyLeasesAssumedAcquired        
Related party leases assumed remaining     5mnro_NumberOfRelatedPartyLeasesAssumedRemaining    
New leases contemplated     0mnro_NumberOfNewLeases    
Purchased property and building of leased location $ 1,000,000us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment        
Operating and capital leases     717,000mnro_OperatingAndCapitalLeases 702,000mnro_OperatingAndCapitalLeases 685,000mnro_OperatingAndCapitalLeases
Annual advisory fee     300,000mnro_RelatedPartyInvestmentAdvisoryFees 300,000mnro_RelatedPartyInvestmentAdvisoryFees 300,000mnro_RelatedPartyInvestmentAdvisoryFees
Amount payable     $ 0us-gaap_DueToRelatedPartiesCurrentAndNoncurrent $ 0us-gaap_DueToRelatedPartiesCurrentAndNoncurrent