Document and Entity Information - shares	3 Months Ended
	Jun. 24, 2017	Jul. 21, 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	Jun. 24, 2017
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock Shares Outstanding		32,724,124