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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. 24, 2022
Sep. 25, 2021
Sep. 26, 2020
Class A Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 210,480,738 $ 185,964,771 $ 128,634,913
Conversion of Class B to Class A shares 62,278,190 63,766,687 49,966,520
Net income allocated, diluted $ 272,758,928 $ 249,731,458 $ 178,601,433
Weighted average shares outstanding, basic 14,330,809 14,242,276 14,194,819
Conversion of Class B to Class A shares 4,663,567 5,370,894 6,064,957
Weighted average shares outstanding, diluted 18,994,376 19,613,170 20,259,776
Earnings per share, Basic $ 14.69 $ 13.06 $ 9.06
Earnings per share, Diluted $ 14.36 $ 12.73 $ 8.82
Class B Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 62,278,190 $ 63,766,687 $ 49,966,520
Net income allocated, diluted $ 62,278,190 $ 63,766,687 $ 49,966,520
Weighted average shares outstanding, basic 4,663,567 5,370,894 6,064,957
Weighted average shares outstanding, diluted 4,663,567 5,370,894 6,064,957
Earnings per share, Basic $ 13.35 $ 11.87 $ 8.24
Earnings per share, Diluted $ 13.35 $ 11.87 $ 8.24