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Marketable Securities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Oct. 02, 2020 | Sep. 27, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Noncurrent, Maximum Contractual Maturity | 2 years |
Debt Securities, Available-for-sale, Current | $ 408.1 | $ 203.3
Debt Securities, Available-for-sale, Noncurrent | 5.2 | 27.6
US Treasury and Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | 129.4 | 34.2
Debt Securities, Available-for-sale, Noncurrent | 5.0 | 20.0
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | 276.8 | 66.2
Debt Securities, Available-for-sale, Noncurrent | 0.0 | 5.9
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | 1.9 | 102.9
Debt Securities, Available-for-sale, Noncurrent | $ 0.2 | $ 1.7

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