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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. 26, 2020	Dec. 28, 2019
Class A Common Stock [Member]
Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share [Line Items]
Net income allocated, basic	$ 38,813,986	$ 12,728,647
Conversion of Class B to Class A shares	15,010,101	4,958,706
Net income allocated, diluted	$ 53,824,087	$ 17,687,353
Weighted average shares outstanding, basic	14,213,562	14,182,683
Conversion of Class B to Class A shares	6,046,214	6,077,093
Weighted average shares outstanding, diluted	20,259,776	20,259,776
Earnings per share, Basic	$ 2.73	$ 0.90
Earnings per share, Diluted	$ 2.66	$ 0.87
Class B Common Stock [Member]
Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share [Line Items]
Net income allocated, basic	$ 15,010,101	$ 4,958,706
Net income allocated, diluted	$ 15,010,101	$ 4,958,706
Weighted average shares outstanding, basic	6,046,214	6,077,093
Weighted average shares outstanding, diluted	6,046,214	6,077,093
Earnings per share, Basic	$ 2.48	$ 0.82
Earnings per share, Diluted	$ 2.48	$ 0.82

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Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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