Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Millions	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Business Acquisition [Line Items]
Goodwill	$ 623.9	$ 612.2	$ 293.6
Cancer Treatment Services International
Business Acquisition [Line Items]
Assets acquired	52.1
Liabilities assumed	(68.0)
Goodwill	186.1
Intangible assets	111.8
Fair value of net assets	282.0
Less: Non-controlling interest	5.0
Total purchase consideration	277.0
Cash and cash equivalents acquired	4.9
Deferred tax liabilities assumed	32.9
Endocare and Alicon
Business Acquisition [Line Items]
Assets acquired	33.8
Liabilities assumed	(18.7)
Goodwill	118.5
Intangible assets	76.4
Fair value of net assets	210.0
Less: Non-controlling interest	0.0
Total purchase consideration	210.0
Cash and cash equivalents acquired	11.5
Deferred tax liabilities assumed	15.7
Embolics Microspheres Business
Business Acquisition [Line Items]
Assets acquired	22.4
Liabilities assumed	(16.0)
Goodwill	45.8
Intangible assets	37.8
Fair value of net assets	90.0
Less: Non-controlling interest	0.0
Total purchase consideration	$ 90.0