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Document and Entity Information - shares
 3 Months Ended
Jun. 27, 2015
Jul. 17, 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 Jun. 27, 2015  
Amendment Flag false  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --03-26  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock Shares Outstanding   31,951,087