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Document and Entity Information - shares	9 Months Ended
	Dec. 24, 2016	Jan. 20, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	MONRO MUFFLER BRAKE INC
Entity Central Index Key	0000876427
Document Type	10-Q
Document Period End Date	Dec. 24, 2016
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--03-25
Entity Filer Category	Large Accelerated Filer
Entity Common Stock Shares Outstanding		32,566,220

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