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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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