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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 9 Months Ended
Jun. 24, 2023
Jun. 25, 2022
Jun. 24, 2023
Jun. 25, 2022
Class A Common Stock [Member]        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 37,416,992 $ 52,356,721 $ 122,532,744 $ 156,187,339
Conversion of Class B to Class A shares 10,842,551 15,406,187 35,638,085 46,405,934
Net income allocated, diluted $ 48,259,543 $ 67,762,908 $ 158,170,829 $ 202,593,273
Weighted average shares outstanding, basic 14,404,387 14,350,835 14,390,853 14,316,342
Conversion of Class B to Class A shares 4,589,989 4,643,541 4,603,523 4,678,034
Weighted average shares outstanding, diluted 18,994,376 18,994,376 18,994,376 18,994,376
Earnings per share, Basic $ 2.60 $ 3.65 $ 8.51 $ 10.91
Earnings per share, Diluted $ 2.54 $ 3.57 $ 8.33 $ 10.67
Class B Common Stock [Member]        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 10,842,551 $ 15,406,187 $ 35,638,085 $ 46,405,934
Net income allocated, diluted $ 10,842,551 $ 15,406,187 $ 35,638,085 $ 46,405,934
Weighted average shares outstanding, basic 4,589,989 4,643,541 4,603,523 4,678,034
Weighted average shares outstanding, diluted 4,589,989 4,643,541 4,603,523 4,678,034
Earnings per share, Basic $ 2.36 $ 3.32 $ 7.74 $ 9.92
Earnings per share, Diluted $ 2.36 $ 3.32 $ 7.74 $ 9.92