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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. 30, 2023
Sep. 24, 2022
Sep. 25, 2021
Class A Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 163,599,005 $ 210,480,738 $ 185,964,771
Conversion of Class B to Class A shares 47,212,954 62,278,190 63,766,687
Net income allocated, diluted $ 210,811,959 $ 272,758,928 $ 249,731,458
Weighted average shares outstanding, basic 14,417,916 14,330,809 14,242,276
Conversion of Class B to Class A shares 4,576,460 4,663,567 5,370,894
Weighted average shares outstanding, diluted 18,994,376 18,994,376 19,613,170
Earnings per share, Basic $ 11.35 $ 14.69 $ 13.06
Earnings per share, Diluted $ 11.10 $ 14.36 $ 12.73
Class B Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 47,212,954 $ 62,278,190 $ 63,766,687
Net income allocated, diluted $ 47,212,954 $ 62,278,190 $ 63,766,687
Weighted average shares outstanding, basic 4,576,460 4,663,567 5,370,894
Weighted average shares outstanding, diluted 4,576,460 4,663,567 5,370,894
Earnings per share, Basic $ 10.32 $ 13.35 $ 11.87
Earnings per share, Diluted $ 10.32 $ 13.35 $ 11.87