Document and Entity Information - shares	6 Months Ended
	Sep. 26, 2015	Oct. 23, 2015
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	Sep. 26, 2015
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--03-26
Entity Filer Category	Large Accelerated Filer
Entity Common Stock Shares Outstanding		31,976,755