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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. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Class A Common Stock [Member]
        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 8,527,374 $ (8,081,085) $ 20,784,430 $ 2,904,941
Conversion of Class B to Class A shares 5,306,856   13,037,857 2,328,639
Net income allocated, diluted 13,834,230 (8,081,085) 33,822,287 5,233,580
Weighted average shares outstanding, basic 13,509,637 12,982,792 13,468,474 12,966,377
Conversion of Class B to Class A shares 9,250,139   9,291,302 11,276,916
Weighted average shares outstanding, diluted 22,759,776 12,982,792 22,759,776 24,243,293
Earnings per share, Basic $ 0.63 $ (0.62) $ 1.54 $ 0.23
Earnings per share, Diluted $ 0.61 $ (0.62) $ 1.49 $ 0.21
Class B Common Stock [Member]
        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic 5,306,856 (6,343,138) 13,037,857 2,328,639
Net income allocated, diluted $ 5,306,856 $ (6,343,138) $ 13,037,857 $ 2,328,639
Weighted average shares outstanding, basic 9,250,139 11,227,533 9,291,302 11,276,916
Weighted average shares outstanding, diluted 9,250,139 11,227,533 9,291,302 11,276,916
Earnings per share, Basic $ 0.57 $ (0.56) $ 1.40 $ 0.21
Earnings per share, Diluted $ 0.57 $ (0.56) $ 1.40 $ 0.21