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Summary of Significant Accounting Policies - Intangible Assets (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 29, 2024 USD ($) | Mar. 30, 2024 USD ($) | Dec. 30, 2023 USD ($) | Jul. 01, 2023 USD ($) | Sep. 24, 2022 USD ($) | Jun. 25, 2022 USD ($) | Sep. 28, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 24, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | $ 174,800,000 |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | 186,900,000 |  |  | $ 5,600,000 | $ 44,300,000 | $ 27,700,000
Ultrasound Imaging Assets |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | 26,400,000 |  |  |  |  |
Ultrasound Imaging Assets, Equipment |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | 5,800,000 |  |  |  |  |
In-process research and development |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | 10,500,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  |  |  |  | 5 years |  |
Maximum |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  |  |  |  | 30 years |  |
Developed technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  | $ 13,900,000 |  |  |  |  | $ 0 |  |
Trade names |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  | 500,000 |  |  |  |  | 0 |  |
In-process research and development |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets, fair value |  |  |  | $ 26,500,000 |  |  |  |  |
In-process research and development | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Measurement input |  |  |  | 0.170 |  |  |  |  |
Ultrasound Imaging Assets, Developed Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | $ 20,600,000 |  |  |  |  |
Mobidiag |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Accelerated amortization |  |  | $ 7,300,000 |  |  |  |  |  |
Mobidiag | In-process research and development |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  | 4,300,000 |  |  |  |  |  |
Intangible assets, current |  |  | 22,400,000 |  |  |  | $ 22,400,000 |  |
Impairment of intangible assets and equipment |  |  | 4,300,000 |  |  |  |  |  |
Mobidiag | Customer relationship |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  | 0 |  |  |  |  |  |
Mobidiag | Trade names |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  |  | $ 0 |  |  |  |  |  |
Mobidiag Oy |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | 186,900,000 |  |  |  |  |
Mobidiag Oy | Equipment |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | 12,100,000 |  |  |  |  |
Mobidiag Oy | Trade names |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | 10,700,000 |  |  |  |  |
Mobidiag Oy | Customer relationship |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | 10,400,000 |  |  |  |  |
Mobidiag Oy | Developed Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  | $ 153,700,000 | $ 27,700,000 |  |  |  |
Focal Therapeutics |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  | 26,800,000 |  |  |  |  |  |  |
Focal Therapeutics | Developed technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment | $ 13,300,000 | 25,900,000 |  |  |  |  |  |  |
Finite-lived intangible assets, net |  | 13,900,000 |  |  |  |  |  |  |
Focal Therapeutics | Trade names |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment | $ 400,000 | 900,000 |  |  |  |  |  |  |
Finite-lived intangible assets, net |  | $ 500,000 |  |  |  |  |  |  |
Focal Therapeutics | Developed Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  |  | $ 8,200,000 |  |  |  |
Faxitron | Developed Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets and equipment |  |  |  |  |  | $ 9,200,000 |  |  |

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