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Business Overview And Summary Of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2011
years
months
Business Overview And Summary Of Significant Accounting Policies [Abstract]  
Approximate amount of company owned or leased store locations 2,600
Initial lease term of certain distribution centers and manufacturing and store locations, minimum (in months) 1
Initial lease term of certain distribution centers and manufacturing and store locations, maximum (in months) 60
Initial lease terms of most store locations, minimum (in months) 36
Initial lease terms of most store locations, maximum (in months) 48
Leasehold improvements on operating leases amortization period (in months) 36
Terms of semi-tractor leases (in months) 36
Term of non-cancellable pick-up leases (in years) 1
Renewal options for non-cancellable pick-up leases, maximum (in months) 72
Options termination period (in months) 13
Number of financial institutions where cash and cash equivalents are primarily held 2
Options vesting and exercisable, maximum (in years) eight