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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. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Class A Common Stock      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 185,964,771 $ 128,634,913 $ 58,635,758
Conversion of Class B to Class A shares 63,766,687 49,966,520 22,944,244
Net income allocated, diluted $ 249,731,458 $ 178,601,433 $ 81,580,002
Weighted average shares outstanding, basic 14,242,276 14,194,819 14,163,776
Conversion of Class B to Class A shares 5,370,894 6,064,957 6,096,000
Weighted average shares outstanding, diluted 19,613,170 20,259,776 20,259,776
Earnings per share, Basic $ 13.06 $ 9.06 $ 4.14
Earnings per share, Diluted $ 12.73 $ 8.82 $ 4.03
Class B Common Stock [Member]      
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]      
Net income allocated, basic $ 63,766,687 $ 49,966,520 $ 22,944,244
Net income allocated, diluted $ 63,766,687 $ 49,966,520 $ 22,944,244
Weighted average shares outstanding, basic 5,370,894 6,064,957 6,096,000
Weighted average shares outstanding, diluted 5,370,894 6,064,957 6,096,000
Earnings per share, Basic $ 11.87 $ 8.24 $ 3.76
Earnings per share, Diluted $ 11.87 $ 8.24 $ 3.76