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Earnings Per Common Share (Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share) (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 29, 2012
Sep. 29, 2012
Jun. 23, 2012
Mar. 24, 2012
Dec. 24, 2011
Sep. 28, 2013
Sep. 29, 2012
Sep. 24, 2011
Class A Common Stock [Member]
                      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]                      
Net income allocated, basic                 $ 11,638,545 $ 24,151,777 $ 21,540,808
Conversion of Class B to Class A shares                 9,157,345 19,292,566 17,518,702
Net income allocated, diluted                 20,795,890 43,444,343 39,059,510
Weighted average shares outstanding, basic                 13,054,425 12,936,583 12,905,408
Conversion of Class B to Class A shares                 10,817,989 11,364,899 11,542,049
Weighted average shares outstanding, diluted                 23,872,414 24,301,482 24,447,457
Earnings per share, Basic $ 0.71 $ (0.62) $ 0.35 $ 0.50 $ 0.58 $ 0.56 $ 0.28 $ 0.45 $ 0.89 $ 1.87 $ 1.67
Earnings per share, Diluted $ 0.68 $ (0.62) $ 0.33 $ 0.48 $ 0.55 $ 0.54 $ 0.27 $ 0.43 $ 0.87 $ 1.79 $ 1.60
Class B Common Stock [Member]
                      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]                      
Net income allocated, basic                 9,157,345 19,292,566 17,518,702
Net income allocated, diluted                 $ 9,157,345 $ 19,292,566 $ 17,518,702
Weighted average shares outstanding, basic                 10,817,989 11,364,899 11,542,049
Weighted average shares outstanding, diluted                 10,817,989 11,364,899 11,542,049
Earnings per share, Basic $ 0.65 $ (0.56) $ 0.32 $ 0.45 $ 0.52 $ 0.51 $ 0.26 $ 0.41 $ 0.85 $ 1.70 $ 1.52
Earnings per share, Diluted $ 0.65 $ (0.56) $ 0.32 $ 0.45 $ 0.52 $ 0.51 $ 0.26 $ 0.41 $ 0.85 $ 1.70 $ 1.52