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Earnings Per Common Share (Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
 3 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Class A Common Stock    
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]    
Net income allocated, basic $ 50,899,553 $ 38,813,986
Conversion of Class B to Class A shares 15,289,465 15,010,101
Net income allocated, diluted $ 66,189,018 $ 53,824,087
Weighted average shares outstanding, basic 14,277,211 14,213,562
Conversion of Class B to Class A shares 4,717,165 6,046,214
Weighted average shares outstanding, diluted 18,994,376 20,259,776
Earnings per share, Basic $ 3.57 $ 2.73
Earnings per share, Diluted $ 3.48 $ 2.66
Class B Common Stock    
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]    
Net income allocated, basic $ 15,289,465 $ 15,010,101
Net income allocated, diluted $ 15,289,465 $ 15,010,101
Weighted average shares outstanding, basic 4,717,165 6,046,214
Weighted average shares outstanding, diluted 4,717,165 6,046,214
Earnings per share, Basic $ 3.24 $ 2.48
Earnings per share, Diluted $ 3.24 $ 2.48