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Selected Quarterly Financial Data (Unaudited Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 29, 2012
Jun. 29, 2012
Mar. 29, 2012
Dec. 29, 2011
Sep. 24, 2011
Jun. 24, 2011
Mar. 24, 2011
Dec. 24, 2010
Sep. 29, 2012
Sep. 24, 2011
Sep. 25, 2010
Unaudited Financial Data                      
Net sales $ 991,773 $ 917,756 $ 881,667 $ 918,238 $ 905,819 $ 910,978 $ 870,371 $ 872,753 $ 3,709,433,820 $ 3,559,921,334 $ 3,390,051,840
Gross profit 219,220 205,952 192,435 201,728 202,420 201,340 194,636 193,480 819,335,452 791,876,191 762,926,913
Net income 13,276 13,059 6,512 10,597 10,962 12,725 7,721 7,652 43,444,343 39,059,510 30,842,189
Class A Common Stock [Member]
                      
Unaudited Financial Data                      
Net income                 0 0 0
Basic earnings per common share $ 0.58 $ 0.56 $ 0.28 $ 0.45 $ 0.47 $ 0.54 $ 0.33 $ 0.33 $ 1.87 $ 1.67 $ 1.32
Diluted earnings per common share $ 0.55 $ 0.54 $ 0.27 $ 0.43 $ 0.45 $ 0.52 $ 0.32 $ 0.31 $ 1.79 $ 1.60 $ 1.26
Class B Common Stock [Member]
                      
Unaudited Financial Data                      
Net income                 $ 0 $ 0 $ 0
Basic earnings per common share $ 0.52 $ 0.51 $ 0.26 $ 0.41 $ 0.43 $ 0.49 $ 0.30 $ 0.30 $ 1.70 $ 1.52 $ 1.20
Diluted earnings per common share $ 0.52 $ 0.51 $ 0.26 $ 0.41 $ 0.43 $ 0.49 $ 0.30 $ 0.30 $ 1.70 $ 1.52 $ 1.20