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Summary of Significant Accounting Policies - Intangible Assets and Goodwill (Details) - USD ($) $ in Millions | Sep. 25, 2021 | Sep. 26, 2020 | Aug. 23, 2020
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 3,281.6 | $ 2,657.9 |
Goodwill not at risk of failing impairment | $ 3,300.0 |  |
Acessa Health |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  |  | $ 49.1

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