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Commitments and Contingencies (Details) (USD $)
In Thousands
12 Months Ended
Sep. 24, 2011
Sep. 25, 2010
Sep. 26, 2009
Commitments and Contingencies [Abstract]   
Rental expense under operating leases$ 18,868$ 17,561$ 17,254
Future minimum rental commitments under noncancelable operating lease agreements [Abstract]   
201215,836  
201313,346  
201411,540  
20158,480  
20164,993  
2017 and thereafter4,709  
Self Insurance [Abstract]   
Accrued insurance liabilities52,84155,445 
Portion of the estimated self-insurance liability that exceeds insurance deductibles$ 17,513$ 17,990