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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. 28, 2019	Dec. 29, 2018
Class A Common Stock [Member]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Net income allocated, basic	$ 12,728,647	$ 15,903,095
Conversion of Class B to Class A shares	4,958,706	6,249,242
Net income allocated, diluted	$ 17,687,353	$ 22,152,337
Weighted average shares outstanding, basic	14,182,683	14,145,385
Conversion of Class B to Class A shares	6,077,093	6,114,391
Weighted average shares outstanding, diluted	20,259,776	20,259,776
Earnings per share, Basic	$ 0.90	$ 1.12
Earnings per share, Diluted	$ 0.87	$ 1.09
Class B Common Stock [Member]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Net income allocated, basic	$ 4,958,706	$ 6,249,242
Net income allocated, diluted	$ 4,958,706	$ 6,249,242
Weighted average shares outstanding, basic	6,077,093	6,114,391
Weighted average shares outstanding, diluted	6,077,093	6,114,391
Earnings per share, Basic	$ 0.82	$ 1.02
Earnings per share, Diluted	$ 0.82	$ 1.02

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