Document and Entity Information	3 Months Ended
	Dec. 27, 2014	Jan. 23, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Dec. 27, 2014
Amendment Flag	false
Entity Registrant Name	MONRO MUFFLER BRAKE INC
Entity Central Index Key	0000876427
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--03-28
Entity Filer Category	Large Accelerated Filer
Entity Well Known Seasoned Issuer	Yes
Entity Common Stock Shares Outstanding		31,660,756
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3