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Summary of Significant Accounting Policies - Medical Aesthetics Impairment and Other Activity (Details) - USD ($)	3 Months Ended				12 Months Ended
	Sep. 25, 2021	Dec. 26, 2020	Dec. 28, 2019	Mar. 30, 2019	Sep. 28, 2019	Sep. 26, 2020
Business Acquisition [Line Items]
Impairment charge	$ 1,800,000	$ 30,200,000	$ 30,200,000	$ 685,400,000
Goodwill and Intangible Asset Impairment					$ 685,400,000
Acessa Health | Trade names
Business Acquisition [Line Items]
Identifiable intangible assets:						$ 1,200,000
Medical Aesthetics
Business Acquisition [Line Items]
Impairment charge			$ 30,200,000
Distribution agreement [Member] | Medical Aesthetics
Business Acquisition [Line Items]
Impairment charge					27,700,000
Customer Relationships | Medical Aesthetics
Business Acquisition [Line Items]
Impairment charge					22,400,000
Trade names | Medical Aesthetics
Business Acquisition [Line Items]
Impairment charge					48,600,000
Developed Technology | Medical Aesthetics
Business Acquisition [Line Items]
Impairment charge					576,900,000
Property, Plant and Equipment [Member] | Medical Aesthetics
Business Acquisition [Line Items]
Impairment charge					$ 9,800,000

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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