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Marketable Securities (Details) - USD ($) $ in Millions | Dec. 29, 2023 | Sep. 29, 2023
--- | --- | ---
Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | $ 15.9 | $ 15.6
Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Noncurrent | 2.0 | 4.1
US Treasury and Government [Member] | Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | 15.7 | 15.1
US Treasury and Government [Member] | Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Noncurrent | 2.0 | 4.1
Corporate Debt Securities [Member] | Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | 0.2 | 0.0
Corporate Debt Securities [Member] | Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Noncurrent | 0.0 | 0.0
US States and Political Subdivisions Debt Securities [Member] | Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | 0.0 | 0.5
US States and Political Subdivisions Debt Securities [Member] | Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Noncurrent | $ 0.0 | $ 0.0

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