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Acquisitions Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Dec. 27, 2014
All finite lived intangible assets  
Acquired Finite-Lived Intangible Assets [Line Items]  
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles $ 8,759us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= mnro_AllFiniteLivedIntangibleAssetsMember
Weighted average useful life 12 years
Trade names  
Acquired Finite-Lived Intangible Assets [Line Items]  
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles 3,548us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Weighted average useful life 14 years
Customer relationships  
Acquired Finite-Lived Intangible Assets [Line Items]  
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles 3,616us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Weighted average useful life 7 years
Favorable leases  
Acquired Finite-Lived Intangible Assets [Line Items]  
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles $ 1,595us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeaseAgreementsMember
Weighted average useful life 17 years