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Marketable Securities (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jul. 01, 2022 | Oct. 01, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Document Period End Date | Jul. 01, 2022 |
Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | $ 16.2 | $ 137.2
Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Noncurrent | 3.0 | 7.1
US Treasury and Government [Member] | Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | 8.0 | 7.6
US Treasury and Government [Member] | Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Noncurrent | 2.9 | 6.0
Corporate Debt Securities [Member] | Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Current | 0.0 | 117.0
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 | 8.2 | 12.6
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 | $ 0.1 | $ 1.1

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