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Summary of Significant Accounting Policies - Intangible Assets and Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018 | Oct. 01, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | $ 2,657,900,000 | $ 2,563,700,000 |  |
Goodwill impairment charge | $ 685,700,000 | 0 | $ 0 | $ 685,700,000 |
Goodwill not at risk of failing impairment |  | $ 2,600,000,000 |  |  |
Focal Therapeutics |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | $ 31,100,000

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