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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. 26, 2021
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Class A Common Stock [Member]        
Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share [Line Items]        
Net income allocated, basic $ 55,276,248 $ 45,205,674 $ 131,185,114 $ 86,935,954
Conversion of Class B to Class A shares 16,698,244 17,547,368 46,802,459 33,796,721
Net income allocated, diluted $ 71,974,492 $ 62,753,042 $ 177,987,573 $ 120,732,675
Weighted average shares outstanding, basic 14,257,035 14,197,250 14,234,599 14,191,074
Conversion of Class B to Class A shares 4,737,341 6,062,526 5,584,837 6,068,702
Weighted average shares outstanding, diluted 18,994,376 20,259,776 19,819,436 20,259,776
Earnings per share, Basic $ 3.88 $ 3.18 $ 9.22 $ 6.13
Earnings per share, Diluted $ 3.79 $ 3.10 $ 8.98 $ 5.96
Class B Common Stock [Member]        
Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share [Line Items]        
Net income allocated, basic $ 16,698,244 $ 17,547,368 $ 46,802,459 $ 33,796,721
Net income allocated, diluted $ 16,698,244 $ 17,547,368 $ 46,802,459 $ 33,796,721
Weighted average shares outstanding, basic 4,737,341 6,062,526 5,584,837 6,068,702
Weighted average shares outstanding, diluted 4,737,341 6,062,526 5,584,837 6,068,702
Earnings per share, Basic $ 3.52 $ 2.89 $ 8.38 $ 5.57
Earnings per share, Diluted $ 3.52 $ 2.89 $ 8.38 $ 5.57