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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2010
Corporate Joint Venture [Member]
May 31, 2012
Corporate Joint Venture [Member]
May 31, 2011
Corporate Joint Venture [Member]
Aug. 31, 2011
Corporate Joint Venture [Member]
Aug. 31, 2011
Minority Shareholder Of Subsidiary [Member]
May 31, 2012
Immediate Family Member of Management or Principal Owner [Member]
May 31, 2012
Corporate Joint Venture [Member]
May 31, 2011
Corporate Joint Venture [Member]
May 31, 2012
Corporate Joint Venture [Member]
May 31, 2011
Corporate Joint Venture [Member]
May 31, 2012
Maximum [Member]
Corporate Joint Venture [Member]
May 31, 2011
Maximum [Member]
Corporate Joint Venture [Member]
May 31, 2012
Maximum [Member]
Minority Shareholder Of Subsidiary [Member]
May 31, 2012
Maximum [Member]
Immediate Family Member of Management or Principal Owner [Member]
Aug. 31, 2011
Maximum [Member]
Immediate Family Member of Management or Principal Owner [Member]
May 31, 2012
Partnership Interest [Member]
store
May 31, 2011
Partnership Interest [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Auto Parts Business Segment President [Member]
May 31, 2011
Partnership Interest [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Property One [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Property One [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2011
Partnership Interest [Member]
Property One [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Property One [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2011
Partnership Interest [Member]
Property One [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Property Two [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Property Two [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2011
Partnership Interest [Member]
Property Two [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Property Two [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2011
Partnership Interest [Member]
Property Two [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Property Three [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Partnership Interest [Member]
Property Three [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
May 31, 2012
Amix Salvage And Sales Ltd [Member]
Minority Shareholder Of Subsidiary [Member]
May 31, 2012
Amix Salvage And Sales Ltd [Member]
Minority Shareholder Of Subsidiary [Member]
Related Party Transaction [Line Items]                                                                    
Related Party Transaction, Amounts of Transaction             $ 11 $ 14 $ 34 $ 37                                                
Advances to (payments from)   1 (1)               1 1                                            
Due to Affiliate   2   2                                                            
Investments in and Advances to Affiliates, at Fair Value, Gross Additions 2                                                                  
Related Party Transaction, Expenses from Transactions with Related Party                                                                 3 8
Accounts Payable, Related Parties         0               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                                 1 1 1 1                            
Related Party Transaction Rent Expense                                           1 1 1 1   1 1 1 1 1 1    
Related Party Transaction Lease Term                                         5 years         5 years                
Related Party Transaction Percentage Of Shared Legal And Consulting Costs           50.00%                                                        
Accounts Receivable, Related Parties                           $ 1 $ 1