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Marketable Securities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 27, 2024 | Sep. 27, 2024
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent, maximum contractual maturity | 2 years |
Current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, current | $ 136.7 | $ 194.1
Noncurrent assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent | 15.6 | 11.4
U.S. Treasury and government securities | Current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, current | 45.4 | 39.0
U.S. Treasury and government securities | Noncurrent assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent | 15.5 | 11.1
Corporate bonds and notes | Current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, current | 91.3 | 155.0
Corporate bonds and notes | Noncurrent assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent | 0.1 | 0.3
Municipal bonds | Current assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, current | 0.0 | 0.1
Municipal bonds | Noncurrent assets |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities, noncurrent | $ 0.0 | $ 0.0

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