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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 26, 2020 | Jun. 27, 2020 | Dec. 28, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Intangible asset and equipment impairment charges | $ 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 | 427.0 |  |
2028 Senior Notes |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value of debt instrument | $ 974.0 |  |
Medical Aesthetics |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Intangible asset and equipment impairment charges |  | $ 30.2 |

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