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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Nov. 30, 2013
Nov. 30, 2013
Partnership Interest [Member]
store
Nov. 30, 2013
Corporate Joint Venture [Member]
Nov. 30, 2012
Corporate Joint Venture [Member]
Aug. 31, 2013
Corporate Joint Venture [Member]
Nov. 30, 2012
Minority Shareholder Of Subsidiary [Member]
Amix Salvage And Sales Ltd [Member]
Aug. 31, 2012
Other Affiliates [Member]
Nov. 30, 2013
Auto Parts Business Segment President [Member]
Partnership Interest [Member]
Nov. 30, 2012
Auto Parts Business Segment President [Member]
Partnership Interest [Member]
Nov. 30, 2013
Immediate Family Member of Management or Principal Owner [Member]
Aug. 31, 2013
Immediate Family Member of Management or Principal Owner [Member]
Related Party Transaction [Line Items]                      
Related Party Transaction, Purchases from Joint Ventures     $ 7 $ 6              
Advances to joint ventures, net (Less Than $1 Million For The Three Month Period Ended November 30, 2013)     1                
Payments from joint ventures, net (Less Than $1 Million For The Three Month Period Ended November 30, 2012)       1              
Due to Affiliate     3   3            
Accounts Receivable, Related Parties (MMGL - Immediate Family Member of Management or Principal, Less Than $1 Million as of August 31, 2013)     1   1   1       1
Business Acquisition, Effective Date of Acquisition Mar. 31, 2011                    
Redeemable Noncontrolling Interest Purchase Date Mar. 08, 2013                    
Related Party Transaction, Expenses from Transactions with Related Party (Less Than $1 Million For The Three Month Period Ended November 30, 2012)           1          
Related Party Noncontrolling Ownership Percentage By Noncontrolling Owners               25.00%      
Related Party Noncontrolling Ownership Percentage By Parent               75.00%      
Related Party Number Of Stores   5                  
Related Party Transaction Related Party Share Of Profit (Less Than $1 Million For The Three Month Periods Ended November 30, 2013 and 2012)               1 1    
Lease Expiration Date               Mar. 31, 2016      
Related Party Transaction Rent Expense (Less Than $1 Million For the Three Month Periods Ended November 30, 2013 and 2012)               1 1    
Related Party Transaction Percentage Of Shared Legal And Consulting Costs                   50.00%  
Accounts Payable, Related Parties (Less Than $1 Million As Of November 30, 2013)                   $ 1