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Related Party Transactions (Narrative) (Details) - USD ($) shares in Millions		12 Months Ended
	Mar. 23, 2021	Sep. 25, 2021	Mar. 19, 2021	Sep. 26, 2020
Equity, Class of Treasury Stock [Line Items]
Aggregate purchase price paid for repurchased shares		$ 79,998,588
Proceeds from short-term loan		400,000
Repayment of short-term loan		400,000
Short-term non-interest bearing loans outstanding to investment/profit sharing plan		0		$ 0
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase authorized amount			$ 2,000,000.0
Class B Common Stock [Member] | Robert P. Ingle, Former CEO and Director [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase number of shares authorized for repurchase	1.3
Aggregate purchase price paid for repurchased shares	$ 80,000,000.0
Common Stock [Member] | Class B Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Aggregate purchase price paid for repurchased shares		$ 63,270

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