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Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Aug. 23, 2020 | Dec. 30, 2019 | Nov. 21, 2019 | Oct. 01, 2019 | Aug. 01, 2019 | Oct. 01, 2018 | Jul. 31, 2018 | Dec. 11, 2017 | Nov. 30, 2019 | Sep. 30, 2019 | Sep. 28, 2019 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018 | Nov. 20, 2019 | Mar. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  | $ 1,459,800,000 | $ 1,307,500,000 |  |  |  | $ 1,307,500,000 | $ 1,459,800,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 2,563,700,000 | 2,657,900,000 |  |  |  | 2,657,900,000 | 2,563,700,000 |  |  |
Portion allocable to fair value of noncontrolling interest |  |  | $ 8,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of contingent holdbacks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,300,000 | 6,500,000 | $ 0 |  |
Acessa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 161,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 81,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value discount rate (percent) | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 48.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acessa | Holdback |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 3,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment period for contingent consideration | 5 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acessa | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets: | $ 127.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acessa | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets: | $ 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Health Beacons |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,700,000 |  |  |  |  |  |  |
Holdback |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  | 2,300,000 |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  | 10,700,000 |  |  |  | 10,700,000 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 6,200,000 |  |  |  | 6,200,000 |  |  |  |
Acquired tangible assets and liabilities |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  | 2,800,000 |  |  |  |
Alpha Imaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | $ 18,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  | $ 900,000 |  |  |  |
Holdback |  |  |  |  |  |  |  |  |  |  | 1,000,000.0 |  |  |  |  |  | $ 1,000,000.0 |  |  |
SuperSonic Imagine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  | 69,300,000 |  | $ 18,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value discount rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |
Goodwill |  |  | 34,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  | 46.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Cash tender offer price per share |  |  |  |  |  |  |  |  |  | $ 1.50 |  |  |  |  |  |  |  |  |  |
Acquired shares |  |  | 7.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership of outstanding shares (as a percent) |  |  | 78.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree (as a percent) |  |  |  |  | 46.00% |  |  |  |  |  |  | 81.00% |  |  |  | 81.00% |  |  |  |
Remeasurement gain |  |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion allocable to equity method investment |  |  | 17,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion allocable to newly acquired shares |  |  |  |  |  |  |  |  | $ 12,600,000 |  |  |  |  |  |  |  |  |  |  |
Portion allocable to loan repaymnet |  |  | 30,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional purchase consideration |  |  | $ 12,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional outstanding shares purchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 |  |  |  |
Additional outstanding shares purchased, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |
SuperSonic Imagine | Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments |  |  |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |  |  |  |
SuperSonic Imagine | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SuperSonic Imagine | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SuperSonic Imagine | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  | 8 years 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Focal Therapeutics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  | $ 12,500,000 |  | $ 120,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | $ 14,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000
Payment period for contingent consideration |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 31,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Focal Therapeutics | In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |  | $ 11,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Focal Therapeutics | In-process research and development | Measurement Input, Discount Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value discount rate (percent) |  |  |  |  |  | 15.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Focal Therapeutics | In-process research and development | Measurement Input, Discount Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value discount rate (percent) |  |  |  |  |  | 16.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Focal Therapeutics | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  | 11 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |  | $ 83,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Focal Therapeutics | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |  | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Faxitron |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  | $ 89,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 45,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in contingent consideration liability |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |
Payment of contingent holdbacks |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |
Payment of contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,100,000 |  |  |  |  |
Faxitron | Holdback |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 11,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment period for contingent consideration |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of contingent holdbacks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,500,000 |  |  |  |
Contingent holdback withheld under indemnification provisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,200,000 |  |  |  |
Faxitron | In-process research and development | Measurement Input, Discount Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value discount rate (percent) |  |  |  |  |  |  | 17.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Faxitron | In-process research and development | Measurement Input, Discount Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value discount rate (percent) |  |  |  |  |  |  | 19.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Faxitron | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |
Faxitron | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |
Emsor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  | $ 16,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  | 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |  |  |  | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Tangible assets and liabilities |  |  |  |  |  |  |  | $ 6,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Emsor | Holdback |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment period for contingent consideration |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |

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