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Dividends (Narrative) (Details) - $ / shares |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 17, 2025 | Jun. 28, 2025 | Jun. 29, 2024 | Jun. 28, 2025 | Jun. 29, 2024
Class A Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock |  | $ 0.165 | $ 0.165 | $ 0.495 | $ 0.495
Class B Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock |  | $ 0.150 | $ 0.150 | $ 0.450 | $ 0.450
O2025 Q1 Dividends [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividend payment date |  |  |  | Oct. 17, 2024 |
Dividend record date |  |  |  | Oct. 10, 2024 |
O2025 Q1 Dividends [Member] | Class A Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock |  |  |  | $ 0.165 |
O2025 Q1 Dividends [Member] | Class B Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock |  |  |  | $ 0.15 |
O2025 Q2 Dividends [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividend payment date |  |  |  | Jan. 16, 2025 |
Dividend record date |  |  |  | Jan. 09, 2025 |
O2025 Q2 Dividends [Member] | Class A Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock |  |  |  | $ 0.165 |
O2025 Q2 Dividends [Member] | Class B Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock |  |  |  | $ 0.15 |
O2025 Q3 Dividends [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividend payment date |  |  |  | Apr. 17, 2025 |
Dividend record date |  |  |  | Apr. 10, 2025 |
O2025 Q3 Dividends [Member] | Class A Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock |  |  |  | $ 0.165 |
O2025 Q3 Dividends [Member] | Class B Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock |  |  |  | $ 0.15 |
O2025 Q4 Dividends [Member] | Subsequent Event [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividend payment date | Jul. 17, 2025 |  |  |  |
Dividend record date | Jul. 10, 2025 |  |  |  |
O2025 Q4 Dividends [Member] | Class A Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock | $ 0.165 |  |  |  |
O2025 Q4 Dividends [Member] | Class B Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Cash dividends per share of common stock | $ 0.15 |  |  |  |

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