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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, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Class A Common Stock [Member]        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 45,205,674 $ 16,913,589 $ 86,935,954 $ 43,579,258
Conversion of Class B to Class A shares 17,547,368 6,596,695 33,796,721 17,083,403
Net income allocated, diluted $ 62,753,042 $ 23,510,284 $ 120,732,675 $ 60,662,661
Weighted average shares outstanding, basic 14,197,250 14,177,335 14,191,074 14,155,632
Conversion of Class B to Class A shares 6,062,526 6,082,441 6,068,702 6,104,144
Weighted average shares outstanding, diluted 20,259,776 20,259,776 20,259,776 20,259,776
Earnings per share, Basic $ 3.18 $ 1.19 $ 6.13 $ 3.07
Earnings per share, Diluted $ 3.10 $ 1.16 $ 5.96 $ 2.99
Class B Common Stock [Member]        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 17,547,368 $ 6,596,695 $ 33,796,721 $ 17,083,403
Net income allocated, diluted $ 17,547,368 $ 6,596,695 $ 33,796,721 $ 17,083,403
Weighted average shares outstanding, basic 6,062,526 6,082,441 6,068,702 6,104,144
Weighted average shares outstanding, diluted 6,062,526 6,082,441 6,068,702 6,104,144
Earnings per share, Basic $ 2.89 $ 1.08 $ 5.57 $ 2.80
Earnings per share, Diluted $ 2.89 $ 1.08 $ 5.57 $ 2.80