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Marketable Securities (Details) - USD ($) $ in Millions | Jun. 28, 2024 | Sep. 29, 2023
--- | --- | ---
Current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, current | $ 5.6 | $ 15.6
Noncurrent assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent | 14.9 | 4.1
U.S. Treasury and government securities | Current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, current | 5.2 | 15.1
U.S. Treasury and government securities | Noncurrent assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent | 14.9 | 4.1
Corporate bonds and notes | Current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, current | 0.3 | 0.0
Corporate bonds and notes | Noncurrent assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent | 0.0 | 0.0
Municipal bonds | Current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, current | 0.1 | 0.5
Municipal bonds | Noncurrent assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent | $ 0.0 | $ 0.0

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