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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. 28, 2024
Sep. 30, 2023
Sep. 24, 2022
Class A Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 82,518,040 $ 163,599,005 $ 210,480,738
Conversion of Class B to Class A shares 23,023,261 47,212,954 62,278,190
Net income allocated, diluted $ 105,541,301 $ 210,811,959 $ 272,758,928
Weighted average shares outstanding, basic 14,534,479 14,417,916 14,330,809
Conversion of Class B to Class A shares 4,459,897 4,576,460 4,663,567
Weighted average shares outstanding, diluted 18,994,376 18,994,376 18,994,376
Earnings per share, Basic $ 5.68 $ 11.35 $ 14.69
Earnings per share, Diluted $ 5.56 $ 11.10 $ 14.36
Class B Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 23,023,261 $ 47,212,954 $ 62,278,190
Net income allocated, diluted $ 23,023,261 $ 47,212,954 $ 62,278,190
Weighted average shares outstanding, basic 4,459,897 4,576,460 4,663,567
Weighted average shares outstanding, diluted 4,459,897 4,576,460 4,663,567
Earnings per share, Basic $ 5.16 $ 10.32 $ 13.35
Earnings per share, Diluted $ 5.16 $ 10.32 $ 13.35