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Earnings Per Common Share (Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share) (Details) - USD ($)
 12 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 30, 2023
Class A Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 65,410,575 $ 82,518,040 $ 163,599,005
Conversion of Class B to Class A shares 18,181,926 23,023,261 47,212,954
Net income allocated, diluted $ 83,592,501 $ 105,541,301 $ 210,811,959
Weighted average shares outstanding, basic 14,546,620 14,534,479 14,417,916
Conversion of Class B to Class A shares 4,447,756 4,459,897 4,576,460
Weighted average shares outstanding, diluted 18,994,376 18,994,376 18,994,376
Earnings per share, Basic $ 4.50 $ 5.68 $ 11.35
Earnings per share, Diluted $ 4.40 $ 5.56 $ 11.10
Class B Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 18,181,926 $ 23,023,261 $ 47,212,954
Net income allocated, diluted $ 18,181,926 $ 23,023,261 $ 47,212,954
Weighted average shares outstanding, basic 4,447,756 4,459,897 4,576,460
Weighted average shares outstanding, diluted 4,447,756 4,459,897 4,576,460
Earnings per share, Basic $ 4.09 $ 5.16 $ 10.32
Earnings per share, Diluted $ 4.09 $ 5.16 $ 10.32