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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 9 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Class A Common Stock        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 9,646,468 $ 8,527,374 $ 29,934,820 $ 20,784,430
Conversion of Class B to Class A shares 4,130,217 5,306,856 13,182,414 13,037,857
Net income allocated, diluted $ 13,776,685 $ 13,834,230 $ 43,117,234 $ 33,822,287
Weighted average shares outstanding, basic 13,777,019 13,509,637 13,657,699 13,468,474
Conversion of Class B to Class A shares 6,482,757 9,250,139 6,602,077 9,291,302
Weighted average shares outstanding, diluted 20,259,776 22,759,776 20,259,776 22,759,776
Earnings per share, Basic $ 0.70 $ 0.63 $ 2.19 $ 1.54
Earnings per share, Diluted $ 0.68 $ 0.61 $ 2.13 $ 1.49
Class B Common Stock        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 4,130,217 $ 5,306,856 $ 13,182,414 $ 13,037,857
Net income allocated, diluted $ 4,130,217 $ 5,306,856 $ 13,182,414 $ 13,037,857
Weighted average shares outstanding, basic 6,482,757 9,250,139 6,602,077 9,291,302
Weighted average shares outstanding, diluted 6,482,757 9,250,139 6,602,077 9,291,302
Earnings per share, Basic $ 0.63 $ 0.57 $ 1.99 $ 1.40
Earnings per share, Diluted $ 0.63 $ 0.57 $ 1.99 $ 1.40