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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 6 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Mar. 29, 2014
Mar. 30, 2013
Class A Common Stock [Member]
        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 6,417,400 $ 4,513,615 $ 12,263,861 $ 10,962,905
Conversion of Class B to Class A shares 4,037,528 3,576,541 7,724,197 8,694,898
Net income allocated, diluted 10,454,928 8,090,156 19,988,058 19,657,803
Weighted average shares outstanding, basic 13,456,262 12,961,853 13,447,893 12,958,169
Conversion of Class B to Class A shares 9,303,514 11,297,923 9,311,883 11,301,607
Weighted average shares outstanding, diluted 22,759,776 24,259,776 22,759,776 24,259,776
Earnings per share, Basic $ 0.47 $ 0.35 $ 0.91 $ 0.85
Earnings per share, Diluted $ 0.46 $ 0.33 $ 0.88 $ 0.81
Class B Common Stock [Member]
        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic 4,037,528 3,576,541 7,724,197 8,694,898
Net income allocated, diluted $ 4,037,528 $ 3,576,541 $ 7,724,197 $ 8,694,898
Weighted average shares outstanding, basic 9,303,514 11,297,923 9,311,883 11,301,607
Weighted average shares outstanding, diluted 9,303,514 11,297,923 9,311,883 11,301,607
Earnings per share, Basic $ 0.43 $ 0.32 $ 0.83 $ 0.77
Earnings per share, Diluted $ 0.43 $ 0.32 $ 0.83 $ 0.77