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Related Party Transactions (Details) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Immediate Family Member of Management or Principal Owner [Member]
Nov. 30, 2010
Corporate Joint Venture [Member]
Feb. 29, 2012
Corporate Joint Venture [Member]
Aug. 31, 2011
Corporate Joint Venture [Member]
Feb. 29, 2012
Minority Shareholder Of Subsidiary [Member]
Feb. 29, 2012
Corporate Joint Venture [Member]
Feb. 28, 2011
Corporate Joint Venture [Member]
Feb. 29, 2012
Corporate Joint Venture [Member]
Feb. 28, 2011
Corporate Joint Venture [Member]
Feb. 28, 2011
Maximum [Member]
Feb. 29, 2012
Maximum [Member]
Feb. 29, 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]
Feb. 29, 2012
Partnership Interest [Member]
store
Feb. 28, 2011
Partnership Interest [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Auto Parts Business Segment President [Member]
Feb. 28, 2011
Partnership Interest [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Property One [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Property One [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 28, 2011
Partnership Interest [Member]
Property One [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Property One [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 28, 2011
Partnership Interest [Member]
Property One [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Property Two [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Property Two [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 28, 2011
Partnership Interest [Member]
Property Two [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Property Two [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 28, 2011
Partnership Interest [Member]
Property Two [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Property Three [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Partnership Interest [Member]
Property Three [Member]
Maximum [Member]
Auto Parts Business Segment President [Member]
Feb. 29, 2012
Amix Salvage And Sales Ltd [Member]
Minority Shareholder Of Subsidiary [Member]
Feb. 29, 2012
Amix Salvage And Sales Ltd [Member]
Minority Shareholder Of Subsidiary [Member]
Related Party Transaction [Line Items]                                                                      
Related Party Transaction, Amounts of Transaction                 $ 13,000,000 $ 13,000,000 $ 23,000,000 $ 23,000,000                                              
Payments to Acquire Interest in and Advances to Joint Ventures, Net 1,000,000 335,000 1,118,000                   1,000,000 1,000,000                                          
Due to Affiliate           2,000,000 2,000,000                                                        
Investments in and Advances to Affiliates, at Fair Value, Gross Additions         2,000,000                                                            
Related Party Transaction, Expenses from Transactions with Related Party                                                                   2,000,000 5,000,000
Related Party Noncontrolling Ownership Percentage By Noncontrolling Owners                                     25.00%                                
Related Party Noncontrolling Ownership Percentage By Parent                                     75.00%                                
Related Party Number Of Stores                                 4                                    
Related Party Transaction Related Party Share Of Profit                                   1,000,000 1,000,000 1,000,000 1,000,000                            
Related Party Transaction Rent Expense                                             1,000,000 1,000,000 1,000,000 1,000,000   1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000    
Related Party Transaction Lease Term                                           5 years         5 years                
Related Party Transaction Percentage Of Shared Legal And Consulting Costs       50.00%                                                              
Accounts Payable, Related Parties               2,000,000             1,000,000                                        
Accounts Receivable, Related Parties                               $ 1,000,000