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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Apr. 01, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Impairment of indefinite intangible assets | $ 46.0 | $ 0.0 | $ 46.0 | $ 0.0
Goodwill impairment charge | 685.7 | $ 0.0 | 685.7 | $ 0.0
Borrowed principal | 1,000.0 |  | 1,000.0 |
Credit Agreement |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Borrowed principal | 1,600.0 |  | 1,600.0 |
Securitization Program |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Borrowed principal | 200.0 |  | 200.0 |
2025 Senior Notes |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Fair value of debt instrument | 900.0 |  | 900.0 |
2028 Senior Notes |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Fair value of debt instrument | 400.0 |  | $ 400.0 |
In-process research and development | Medical Aesthetics |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Impairment of indefinite intangible assets | 46.0 |  |  |
Cynosure |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Goodwill impairment charge | $ 685.7 |  |  |

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