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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. 24, 2022
Dec. 25, 2021
Class A Common Stock [Member]    
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]    
Net income allocated, basic $ 53,708,852 $ 50,899,553
Conversion of Class B to Class A shares 15,662,629 15,289,465
Net income allocated, diluted $ 69,371,481 $ 66,189,018
Weighted average shares outstanding, basic 14,381,312 14,277,211
Conversion of Class B to Class A shares 4,613,064 4,717,165
Weighted average shares outstanding, diluted 18,994,376 18,994,376
Earnings per share, Basic $ 3.73 $ 3.57
Earnings per share, Diluted $ 3.65 $ 3.48
Class B Common Stock [Member]    
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]    
Net income allocated, basic $ 15,662,629 $ 15,289,465
Net income allocated, diluted $ 15,662,629 $ 15,289,465
Weighted average shares outstanding, basic 4,613,064 4,717,165
Weighted average shares outstanding, diluted 4,613,064 4,717,165
Earnings per share, Basic $ 3.40 $ 3.24
Earnings per share, Diluted $ 3.40 $ 3.24