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Disposition - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 20, 2019 | Dec. 14, 2016 | Apr. 01, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  |  | $ 0.0 | $ 0.0 | $ 1,865.0
Blood Screening Business | Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Sales price |  | $ 1,850.0 |  |  |  |
Proceeds from divestiture of businesses |  |  | $ 1,865.0 |  |  |
Gain on disposal |  |  | 899.7 |  |  |
Tax obligation |  |  | 649.5 |  |  |
Proceeds allocated to manufacture of inventory |  |  | $ 13.1 |  |  |
Disposal group, revenue |  |  |  | $ 58.5 | $ 55.4 | $ 44.0
Minimum |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Transition services agreement term |  |  | 2 years |  |  |
Minimum | Blood Screening Business | Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Transition services agreement term |  | 2 years |  |  |  |
Maximum |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Transition services agreement term |  |  | 3 years |  |  |
Maximum | Blood Screening Business | Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Transition services agreement term |  | 3 years |  |  |  |
Subsequent Event | Medical Aesthetics Business |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Sales price | $ 138.0 |  |  |  |  |
Proceeds from divestiture of businesses | $ 205.0 |  |  |  |  |

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