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Selected Quarterly Financial Data (Summary Of Selected Quarterly Financial Data) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 24, 2017 | Mar. 25, 2017 | Dec. 24, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,089,392,000 | $ 984,398,000 | $ 946,152,000 | $ 982,758,000 | $ 962,373,000 | $ 957,178,000 | $ 924,312,000 | $ 951,114,000 | $ 4,002,699,727 | $ 3,794,977,406 | $ 3,778,643,782
Gross profit | 261,290,000 | 237,134,000 | 228,085,000 | 237,084,000 | 237,194,000 | 232,854,000 | 228,718,000 | 225,639,000 | 963,593,003 | 924,405,200 | 893,303,800
Net income | $ 19,372,000 | $ 11,527,000 | $ 9,151,000 | $ 13,824,000 | $ 14,184,000 | $ 12,668,000 | $ 14,358,000 | $ 12,979,000 | $ 53,873,580 | $ 54,189,466 | $ 59,353,123
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share | $ 0.99 | $ 0.58 | $ 0.47 | $ 0.70 | $ 0.72 | $ 0.64 | $ 0.73 | $ 0.66 | $ 2.74 | $ 2.75 | $ 3.02
Diluted earnings per common share | 0.96 | 0.57 | 0.45 | 0.68 | 0.70 | 0.63 | 0.71 | 0.64 | 2.66 | 2.68 | 2.93
Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share | 0.90 | 0.53 | 0.42 | 0.64 | 0.65 | 0.59 | 0.66 | 0.60 | 2.49 | 2.50 | 2.74
Diluted earnings per common share | $ 0.90 | $ 0.53 | $ 0.42 | $ 0.64 | $ 0.65 | $ 0.59 | $ 0.66 | $ 0.60 | $ 2.49 | $ 2.50 | $ 2.74

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