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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. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Class A Common Stock [Member]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Net income allocated, basic	$ 16,913,589	$ 17,557,024	$ 43,579,258	$ 56,551,833
Conversion of Class B to Class A shares	6,596,695	6,926,634	17,083,403	22,373,352
Net income allocated, diluted	$ 23,510,284	$ 24,483,658	$ 60,662,661	$ 78,925,185
Weighted average shares outstanding, basic	14,177,335	14,128,772	14,155,632	14,117,449
Conversion of Class B to Class A shares	6,082,441	6,131,004	6,104,144	6,142,327
Weighted average shares outstanding, diluted	20,259,776	20,259,776	20,259,776	20,259,776
Earnings per share, Basic	$ 1.19	$ 1.24	$ 3.07	$ 4.00
Earnings per share, Diluted	$ 1.16	$ 1.21	$ 2.99	$ 3.90
Class B Common Stock [Member]
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Net income allocated, basic	$ 6,596,695	$ 6,926,634	$ 17,083,403	$ 22,373,352
Net income allocated, diluted	$ 6,596,695	$ 6,926,634	$ 17,083,403	$ 22,373,352
Weighted average shares outstanding, basic	6,082,441	6,131,004	6,104,144	6,142,327
Weighted average shares outstanding, diluted	6,082,441	6,131,004	6,104,144	6,142,327
Earnings per share, Basic	$ 1.08	$ 1.13	$ 2.80	$ 3.64
Earnings per share, Diluted	$ 1.08	$ 1.13	$ 2.80	$ 3.64

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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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