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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 28, 2020 | Dec. 28, 2019 | Mar. 30, 2019 | Mar. 28, 2020 | Mar. 30, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ 9.8 |  |  |  |
Intangible asset and equipment impairment charges |  | $ 30.2 |  | $ 30.2 | $ 443.8
Borrowed principal | 1,000.0 |  |  | 1,000.0 |
Credit Agreement |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Borrowed principal | 2,200.0 |  |  | 2,200.0 |
2025 Senior Notes |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Fair value of debt instrument | 947.6 |  |  | 947.6 |
2028 Senior Notes |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Fair value of debt instrument | 402.1 |  |  | $ 402.1 |
Medical Aesthetics |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Intangible asset and equipment impairment charges | $ 30.2 | $ 30.2 | $ 443.8 |  |
Acquired intangible assets [Member] | Medical Aesthetics |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Intangible asset and equipment impairment charges |  |  | 437.0 |  |
Equipment [Member] | Medical Aesthetics |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Intangible asset and equipment impairment charges |  |  | $ 6.8 |  |

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