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Business Combination - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions							1 Months Ended		3 Months Ended
	Sep. 28, 2020 USD ($)	Aug. 23, 2020 USD ($)	Feb. 03, 2020 USD ($)	Dec. 30, 2019 USD ($)	Nov. 21, 2019 USD ($) shares	Aug. 01, 2019 USD ($)	Nov. 30, 2019 USD ($)	Sep. 30, 2019 $ / shares	Dec. 26, 2020 USD ($)	Dec. 28, 2019	Sep. 26, 2020 USD ($)	Nov. 20, 2019
Business Acquisition [Line Items]
Consideration transferred					$ 69.3
Ownership percentage					78.00%
Goodwill									$ 2,663.3		$ 2,657.9
Equity interest in acquiree, remeasurement gain					$ 3.2
Consideration related to equity method investment					17.9
Consideration related to newly acquired shares							$ 12.6
Consideration, portion related to loan repayment					30.2
Business Combination, Consideration related to fair value of noncontrolling interest					8.6
Discount rate percentage										0.120
Intangible assets, net									1,244.8		$ 1,307.5
Change in contingent consideration									$ 4.6
Developed Technology
Business Acquisition [Line Items]
Intangible assets useful life		10 years
Trade Names
Business Acquisition [Line Items]
Intangible assets useful life		10 years
NXC Imaging
Business Acquisition [Line Items]
Consideration transferred	$ 4.9
NXC Imaging | Customer Relationships
Business Acquisition [Line Items]
Intangible assets useful life	5 years
Acessa Health
Business Acquisition [Line Items]
Consideration transferred		$ 161.3
Goodwill		48.4
Purchase price withheld		$ 81.8
Annual Incremental Revenue Growth Period		3 years
Intangible assets, fair value (percentage)		18.00%
Acessa Health | Contingent Holdback
Business Acquisition [Line Items]
Purchase price withheld		$ 3.0
SuperSonic Imagine
Business Acquisition [Line Items]
Consideration transferred					12.6	$ 18.2
Equity interest in acquiree, Percentage						46.00%			81.00%
Goodwill					$ 34.3
Percentage of outstanding shares acquired						46.00%						50.00%
Cash tender offer price (per share) | $ / shares								$ 1.50
Shares acquired | shares					7.6
Customer relationships					$ 4.0
SuperSonic Imagine | Customer Relationships
Business Acquisition [Line Items]
Intangible assets useful life					9 years
SuperSonic Imagine | Developed Technology
Business Acquisition [Line Items]
Intangible assets useful life					9 years
SuperSonic Imagine | Trade Names
Business Acquisition [Line Items]
Intangible assets useful life					8 years 7 months 6 days
Health Beacons
Business Acquisition [Line Items]
Consideration transferred			$ 19.7
Goodwill			6.2
Intangible assets, net			10.7
Holdback			2.3
Remainder of purchase price			$ 2.8
Alpha Imaging
Business Acquisition [Line Items]
Consideration transferred				$ 18.0
Purchase price withheld				0.9
Holdback				$ 1.0
Alpha Imaging | Customer Relationships
Business Acquisition [Line Items]
Intangible assets useful life				5 years

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