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Marketable Securities (Details) - USD ($) $ in Millions | Mar. 29, 2019 | Sep. 28, 2018
--- | --- | ---
Other Current Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | $ 141.1 | $ 294.1
Other Noncurrent Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 33.9 | 22.8
US Treasury and Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 32.4 |
US Treasury and Government [Member] | Other Current Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 27.3 | 65.0
US Treasury and Government [Member] | Other Noncurrent Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 5.1 | 0.0
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 65.6 |
Corporate Debt Securities [Member] | Other Current Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 53.7 | 204.1
Corporate Debt Securities [Member] | Other Noncurrent Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 11.9 | 12.0
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 73.8 |
US States and Political Subdivisions Debt Securities [Member] | Other Current Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 56.9 | 2.0
US States and Political Subdivisions Debt Securities [Member] | Other Noncurrent Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 16.9 | 0.8
Foreign Government Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 3.2 |
Foreign Government Debt Securities [Member] | Other Current Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | 3.2 | 23.0
Foreign Government Debt Securities [Member] | Other Noncurrent Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities | $ 0.0 | $ 10.0

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