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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. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Class A Common Stock [Member]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Net income allocated, basic	$ 29,017,203	$ 10,773,567	$ 41,740,166	$ 26,678,194
Conversion of Class B to Class A shares	11,275,077	4,226,473	16,239,467	10,474,183
Net income allocated, diluted	$ 40,292,280	$ 15,000,040	$ 57,979,633	$ 37,152,377
Weighted average shares outstanding, basic	14,193,290	14,154,424	14,187,986	14,149,904
Conversion of Class B to Class A shares	6,066,486	6,105,352	6,071,790	6,109,872
Weighted average shares outstanding, diluted	20,259,776	20,259,776	20,259,776	20,259,776
Earnings per share, Basic	$ 2.04	$ 0.76	$ 2.94	$ 1.88
Earnings per share, Diluted	$ 1.99	$ 0.74	$ 2.86	$ 1.83
Class B Common Stock [Member]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Net income allocated, basic	$ 11,275,077	$ 4,226,473	$ 16,239,467	$ 10,474,183
Net income allocated, diluted	$ 11,275,077	$ 4,226,473	$ 16,239,467	$ 10,474,183
Weighted average shares outstanding, basic	6,066,486	6,105,352	6,071,790	6,109,872
Weighted average shares outstanding, diluted	6,066,486	6,105,352	6,071,790	6,109,872
Earnings per share, Basic	$ 1.86	$ 0.69	$ 2.68	$ 1.71
Earnings per share, Diluted	$ 1.86	$ 0.69	$ 2.68	$ 1.71

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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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