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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Oct. 01, 2018 | Oct. 01, 2017 | Oct. 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Contract length | less than one year |  |  |
ASC 606 | Retained earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reduction in opening retained earnings |  | $ 7.1 | $ 0.0 | $ 0.0

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