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Document And Entity Information (USD $)
12 Months Ended
Aug. 31, 2013
Mar. 02, 2013
Oct. 18, 2013
Class A Common Stock [Member]
Oct. 18, 2013
Class B Common Stock [Member]
Document Type 10-K      
Amendment Flag false      
Document Period End Date Aug. 31, 2013      
Document Fiscal Year Focus 2013      
Document Fiscal Period Focus FY      
Entity Registrant Name MSC INDUSTRIAL DIRECT CO INC      
Entity Central Index Key 0001003078      
Current Fiscal Year End Date --08-31      
Entity Filer Category Large Accelerated Filer      
Entity Common Stock, Shares Outstanding     49,270,912 14,140,747
Entity Public Float   $ 4,073,351,019    
Entity Current Reporting Status Yes      
Entity Well-known Seasoned Issuer Yes      
Entity Voluntary Filers No