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Summary of Significant Accounting Policies Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |
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Sep. 27, 2019 | Sep. 28, 2018
Deferred Tax Asset [Domain] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ (1.9)
Accounting Standards Update 2014-09 [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 29.1 |

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