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Quarterly Statement of Operations Information (Unaudited) - (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Impairment of intangible assets and equipment | $ 241.6 | $ 443.8 | $ 30.2 | $ 4.4 | $ 106.7 | $ 46.0
Medical Aesthetics Business |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Other Tax Expense (Benefit) |  |  | $ 312.2 |  |  |

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