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Supplemental Disclosure of Cash Flow Information (Liabilities on acquisitions assumed) (Details) (USD $)	12 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 30, 2013
Business Acquisition [Line Items]
Gain on bargain purchase	$ (386,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount	$ (217,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount	$ 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
Cash paid, net of cash acquired	(84,367,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	(27,467,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	(163,326,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Fiscal 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Fair value of assets acquired	62,184,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2015AcquisitionsMember
Goodwill	79,316,000mnro_BusinessAcquisitionPurchasePriceAllocationGoodwillAmountOriginal / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2015AcquisitionsMember
Gain on bargain purchase	(386,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2015AcquisitionsMember
Cash paid, net of cash acquired	(84,403,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2015AcquisitionsMember
Amounts payable to seller	(3,507,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2015AcquisitionsMember
Liabilities assumed	53,204,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2015AcquisitionsMember
Fiscal 2014 Acquisitions [Member]
Business Acquisition [Line Items]
Fair value of assets acquired		14,330,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2014acquisitionsmemberMember
Goodwill		17,673,000mnro_BusinessAcquisitionPurchasePriceAllocationGoodwillAmountOriginal / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2014acquisitionsmemberMember
Gain on bargain purchase		(217,000)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2014acquisitionsmemberMember
Cash paid, net of cash acquired		(27,482,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2014acquisitionsmemberMember
Liabilities assumed		4,304,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2014acquisitionsmemberMember
Fiscal 2013 Acquisitions [Member]
Business Acquisition [Line Items]
Fair value of assets acquired			101,926,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2013AcquisitionsMember
Goodwill			117,602,000mnro_BusinessAcquisitionPurchasePriceAllocationGoodwillAmountOriginal / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2013AcquisitionsMember
Cash paid, net of cash acquired			(163,275,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2013AcquisitionsMember
Liabilities assumed			$ 56,253,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = mnro_Fiscal2013AcquisitionsMember

X

- Definition

The original amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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