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Disposition - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Dec. 14, 2016	Apr. 01, 2017	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses			$ 0.0	$ 1,865.0	$ 0.0
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			$ 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

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