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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 26, 2020 | Dec. 28, 2019 | Mar. 27, 2021 | Mar. 28, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Intangible asset and equipment impairment charges |  | $ 30.2 | $ 0.0 | $ 30.2
Borrowed principal |  |  | 1,000.0 |
Credit Agreement |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Borrowed principal |  |  | 1,400.0 |
2025 Senior Notes |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Fair value of debt instrument |  |  | 421.7 |
2028 Senior Notes |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Fair value of debt instrument |  |  | $ 932.2 |
Medical Aesthetics |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Intangible asset and equipment impairment charges | $ 30.2 |  |  |

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