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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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