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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, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Class A Common Stock [Member]        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 20,501,422 $ 24,809,358 $ 45,299,894 $ 83,650,769
Conversion of Class B to Class A shares 5,697,533 6,912,241 12,593,416 23,363,057
Net income allocated, diluted $ 26,198,955 $ 31,721,599 $ 57,893,310 $ 107,013,826
Weighted average shares outstanding, basic 14,547,273 14,538,845 14,546,178 14,530,996
Conversion of Class B to Class A shares 4,447,103 4,455,531 4,448,198 4,463,380
Weighted average shares outstanding, diluted 18,994,376 18,994,376 18,994,376 18,994,376
Earnings per share, Basic $ 1.41 $ 1.71 $ 3.11 $ 5.76
Earnings per share, Diluted $ 1.38 $ 1.67 $ 3.05 $ 5.63
Class B Common Stock [Member]        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 5,697,533 $ 6,912,241 $ 12,593,416 $ 23,363,057
Net income allocated, diluted $ 5,697,533 $ 6,912,241 $ 12,593,416 $ 23,363,057
Weighted average shares outstanding, basic 4,447,103 4,455,531 4,448,198 4,463,380
Weighted average shares outstanding, diluted 4,447,103 4,455,531 4,448,198 4,463,380
Earnings per share, Basic $ 1.28 $ 1.55 $ 2.83 $ 5.23
Earnings per share, Diluted $ 1.28 $ 1.55 $ 2.83 $ 5.23