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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 24, 2011
Sep. 25, 2010
Sep. 26, 2009
Mar. 24, 2012
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]        
2012 15,836      
2013 13,346      
2014 11,540      
2015 8,480      
2016 4,993      
2017 and thereafter 4,709      
Self Insurance [Abstract]        
Accrued insurance liabilities 52,841 55,445   49,858
Portion of the estimated self-insurance liability that exceeds insurance deductibles $ 17,513 $ 17,990   $ 16,543