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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 27, 2019 segment market | Sep. 28, 2018 USD ($) | Sep. 28, 2019 USD ($)
Description Of Business And Basis Of Presentation [Line Items] |  |  |
Number of reportable operating segments | segment | 1 |  |
Number of primary markets | market | 3 |  |
Minimum |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |
Definite-lived intangible asset useful life | 5 years |  |
Maximum |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |
Definite-lived intangible asset useful life | 14 years |  |
Disposal Group, Not Discontinued Operations | LR4 |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |
Gain (loss) on disposal |  | $ 34.3 |
Scenario, Forecast | Accounting Standards Update 2016-02 | Minimum |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |
Operating lease liability |  |  | $ 42.0
Operating lease right of use asset |  |  | 33.0
Scenario, Forecast | Accounting Standards Update 2016-02 | Maximum |  |  |
Description Of Business And Basis Of Presentation [Line Items] |  |  |
Operating lease liability |  |  | 46.0
Operating lease right of use asset |  |  | $ 37.0

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