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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 28, 2020 | Mar. 30, 2019 | Dec. 29, 2018 | Mar. 28, 2020 | Mar. 30, 2019 | Sep. 28, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |
Unrecognized Tax Benefits | $ 212.7 |  |  | $ 212.7 |  | $ 101.6
Company's effective tax rate | 20.30% | 22.90% |  | 122.10% | 30.20% |
Increase to income tax expense adoption of ASU 2016-16 |  | $ 29.5 |  |  |  |
Decrease in deferred tax liabilities due to ASC 2016-16 |  | 48.7 |  |  |  |
Increase to Net Income resulted from adoption of ASU 2016-16 |  | $ 19.2 |  |  |  |
Increase to Earnings per Share resulted from adoption of ASC 2016-16 |  | $ 0.07 |  |  |  |
Increase in deferred tax assets resulting from adoption of ASCU 2016-16 |  |  | $ 2.9 |  |  |
Decease in accumulated deficit resulting from adoption of ASCU 2016-16 |  |  | 2.5 |  |  |
Decease to prepaid taxes resulting from adoption of ASCU 2016-16 |  |  | $ 0.4 |  |  |
Medical Aesthetics [Domain] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Other Tax Expense (Benefit) |  |  |  | $ 310.9 |  |

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