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Selected Quarterly Financial Data (Summary Of Selected Quarterly Financial Data) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 24, 2016
Jun. 25, 2016
Mar. 26, 2016
Dec. 26, 2015
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 27, 2014
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Class of Stock [Line Items]                      
Net sales $ 962,373,000 $ 957,178,000 $ 924,312,000 $ 951,114,000 $ 952,838,000 $ 945,974,000 $ 915,335,000 $ 964,497,000 $ 3,794,977,406 $ 3,778,643,782 $ 3,835,985,953
Gross profit 237,194,000 232,854,000 228,718,000 225,639,000 228,056,000 222,164,000 218,691,000 224,393,000 924,405,200 893,303,800 845,163,515
Net income $ 14,184,000 $ 12,668,000 $ 14,358,000 $ 12,979,000 $ 16,236,000 $ 13,777,000 $ 14,302,000 $ 15,038,000 $ 54,189,466 $ 59,353,123 $ 51,426,454
Class A Common Stock [Member]                      
Class of Stock [Line Items]                      
Basic earnings per common share $ 0.72 $ 0.64 $ 0.73 $ 0.66 $ 0.83 $ 0.70 $ 0.72 $ 0.77 $ 2.75 $ 3.02 $ 2.36
Diluted earnings per common share 0.70 0.63 0.71 0.64 0.80 0.68 0.71 0.74 2.68 2.93 2.28
Class B Common Stock [Member]                      
Class of Stock [Line Items]                      
Basic earnings per common share 0.65 0.59 0.66 0.60 0.75 0.63 0.66 0.70 2.50 2.74 2.14
Diluted earnings per common share $ 0.65 $ 0.59 $ 0.66 $ 0.60 $ 0.75 $ 0.63 $ 0.66 $ 0.70 $ 2.50 $ 2.74 $ 2.14