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Selected Quarterly Financial Data (Summary Of Unaudited Selected Quarterly Financial Data) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 30, 2017
Sep. 30, 2017
Jun. 24, 2017
Mar. 25, 2017
Dec. 24, 2016
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Class of Stock [Line Items]                      
Net sales $ 1,059,688,000 $ 1,034,769,000 $ 984,562,000 $ 1,013,786,000 $ 1,089,392,000 $ 984,398,000 $ 946,152,000 $ 982,758,000 $ 4,092,804,877 $ 4,002,699,727 $ 3,794,977,406
Gross profit 256,430,000 243,891,000 235,188,000 244,660,000 261,290,000 237,134,000 228,085,000 237,084,000 980,169,361 963,593,003 924,405,200
Net income $ 18,439,000 24,484,000 [1] $ 9,295,000 45,147,000 [2] $ 19,372,000 $ 11,527,000 $ 9,151,000 $ 13,824,000 97,364,628 53,873,580 54,189,466
Income tax benefit   $ 10,600,000   $ 26,700,000         $ (17,046,000) $ 30,388,000 $ 30,445,000
Class A Common Stock [Member]                      
Class of Stock [Line Items]                      
Basic earnings per common share $ 0.94 $ 1.24 $ 0.47 $ 2.29 $ 0.99 $ 0.58 $ 0.47 $ 0.70 $ 4.94 $ 2.74 $ 2.75
Diluted earnings per common share 0.91 1.21 0.46 2.23 0.96 0.57 0.45 0.68 4.81 2.66 2.68
Class B Common Stock [Member]                      
Class of Stock [Line Items]                      
Basic earnings per common share 0.85 1.13 0.43 2.08 0.90 0.53 0.42 0.64 4.49 2.49 2.50
Diluted earnings per common share $ 0.85 $ 1.13 $ 0.43 $ 2.08 $ 0.90 $ 0.53 $ 0.42 $ 0.64 $ 4.49 $ 2.49 $ 2.50
[1] Includes $10.6 million income tax benefit from the Tax Act.
[2] Includes $26.7 million income tax benefit from the Tax Act.