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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 6 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Mar. 26, 2022
Mar. 27, 2021
Class A Common Stock        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 52,934,311 $ 37,772,564 $ 103,831,190 $ 76,588,658
Conversion of Class B to Class A shares 15,707,036 14,416,429 30,999,174 29,424,423
Net income allocated, diluted $ 68,641,347 $ 52,188,993 $ 134,830,364 $ 106,013,081
Weighted average shares outstanding, basic 14,320,981 14,233,200 14,299,096 14,223,381
Conversion of Class B to Class A shares 4,673,395 5,970,954 4,695,280 6,008,584
Weighted average shares outstanding, diluted 18,994,376 20,204,154 18,994,376 20,231,965
Earnings per share, Basic $ 3.70 $ 2.65 $ 7.26 $ 5.38
Earnings per share, Diluted $ 3.61 $ 2.58 $ 7.10 $ 5.24
Class B Common Stock        
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]        
Net income allocated, basic $ 15,707,036 $ 14,416,429 $ 30,999,174 $ 29,424,423
Net income allocated, diluted $ 15,707,036 $ 14,416,429 $ 30,999,174 $ 29,424,423
Weighted average shares outstanding, basic 4,673,395 5,970,954 4,695,280 6,008,584
Weighted average shares outstanding, diluted 4,673,395 5,970,954 4,695,280 6,008,584
Earnings per share, Basic $ 3.36 $ 2.41 $ 6.60 $ 4.89
Earnings per share, Diluted $ 3.36 $ 2.41 $ 6.60 $ 4.89