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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. 27, 2021
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Class A Common Stock [Member]        
Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share [Line Items]        
Net income allocated, basic $ 37,772,564 $ 29,017,203 $ 76,588,658 $ 41,740,166
Conversion of Class B to Class A shares 14,416,429 11,275,077 29,424,423 16,239,467
Net income allocated, diluted $ 52,188,993 $ 40,292,280 $ 106,013,081 $ 57,979,633
Weighted average shares outstanding, basic 14,233,200 14,193,290 14,223,381 14,187,986
Conversion of Class B to Class A shares 5,970,954 6,066,486 6,008,584 6,071,790
Weighted average shares outstanding, diluted 20,204,154 20,259,776 20,231,965 20,259,776
Earnings per share, Basic $ 2.65 $ 2.04 $ 5.38 $ 2.94
Earnings per share, Diluted $ 2.58 $ 1.99 $ 5.24 $ 2.86
Class B Common Stock [Member]        
Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share [Line Items]        
Net income allocated, basic $ 14,416,429 $ 11,275,077 $ 29,424,423 $ 16,239,467
Net income allocated, diluted $ 14,416,429 $ 11,275,077 $ 29,424,423 $ 16,239,467
Weighted average shares outstanding, basic 5,970,954 6,066,486 6,008,584 6,071,790
Weighted average shares outstanding, diluted 5,970,954 6,066,486 6,008,584 6,071,790
Earnings per share, Basic $ 2.41 $ 1.86 $ 4.89 $ 2.68
Earnings per share, Diluted $ 2.41 $ 1.86 $ 4.89 $ 2.68