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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |
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Oct. 14, 2021 USD ($) | Sep. 25, 2021 USD ($) Customer | Dec. 26, 2020 USD ($) | Dec. 28, 2019 USD ($) | Sep. 28, 2019 | Mar. 30, 2019 USD ($) | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Sep. 25, 2021 USD ($) Customer | Sep. 26, 2020 USD ($) Customer | Sep. 28, 2019 USD ($) | Aug. 23, 2020 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  | $ 1,800,000 | $ 30,200,000 | $ 30,200,000 |  | $ 685,400,000 |  |  |  |  |  |
Cash Equivalents Maturity Period |  |  |  |  |  |  |  |  | three months or less |  |  |
Gross Carrying Value |  | 5,582,100,000 |  |  |  |  |  |  | $ 5,582,100,000 | $ 4,931,100,000 |  |
Accumulated Amortization |  | 3,922,900,000 |  |  |  |  |  |  | 3,922,900,000 | 3,623,600,000 |  |
Goodwill |  | 3,281,600,000 |  |  |  |  |  |  | 3,281,600,000 | 2,657,900,000 |  |
Purchase of interest rate caps |  |  |  |  |  |  | $ 1,500,000 | $ 3,700,000 | 0 | 0 | $ 1,500,000 |
Principal amount of borrowings |  | 1,000,000,000 |  |  |  |  |  |  | 1,000,000,000 |  |  |
Notional Amount |  | 861,500,000 |  |  |  |  |  |  | $ 861,500,000 |  |  |
Product Warranty Term |  |  |  |  |  |  |  |  | 1 year |  |  |
Advertising cost |  |  |  |  |  |  |  |  | $ 9,800,000 | 15,600,000 | 29,500,000 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | 500,000 | $ 2,300,000 |  |
Goodwill and Intangible Asset Impairment |  |  |  |  |  |  |  |  |  |  | 685,400,000 |
Notional amount |  | $ 1,000,000,000 |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers with balance greater than specified percentage | Customer |  | 0 |  |  |  |  |  |  | 0 | 1 |  |
Trade names |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value |  | $ 268,100,000 |  |  |  |  |  |  | $ 268,100,000 | $ 245,500,000 |  |
Accumulated Amortization |  | 191,800,000 |  |  |  |  |  |  | 191,800,000 | 181,200,000 |  |
Developed technology |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value |  | 4,597,700,000 |  |  |  |  |  |  | 4,597,700,000 | 4,054,000,000 |  |
Accumulated Amortization |  | 3,184,200,000 |  |  |  |  |  |  | 3,184,200,000 | 2,907,200,000 |  |
In-process research and development |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value |  | 71,600,000 |  |  |  |  |  |  | 71,600,000 | 0 |  |
Accumulated Amortization |  | 0 |  |  |  |  |  |  | $ 0 | $ 0 |  |
Accounts receivable [Member] | Customer Concentration Risk | One Customer |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  | 11.90% |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  |  |  |  |  |  | 2 years |  |  |
Minimum | Accounts receivable [Member] | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |
Minimum | Total revenues [Member] | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 10.00% |  |  |  | 10.00% | 10.00% |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  |  |  |  |  |  | 30 years |  |  |
Interest rate caps - derivative |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | $ 500,000 | $ 2,300,000 |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate caps - derivative |  | $ 18,700,000 |  |  |  |  |  |  | 18,700,000 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  | 0 | 0 |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  |  |  |  |  |  |  |  | $ 9,400,000 | (27,600,000) | 3,500,000 |
Acessa Health |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 49,100,000
Acessa Health | Trade names |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets: |  |  |  |  |  |  |  |  |  | 1,200,000 |  |
Bolder Surgical | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 160,000,000 |  |  |  |  |  |  |  |  |  |  |
Medical Aesthetics |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  | $ 30,200,000 |  |  |  |  |  |  |  |
Medical Aesthetics | Distribution agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  | 27,700,000 |
Medical Aesthetics | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  | 22,400,000 |
Medical Aesthetics | Trade names |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  | 48,600,000 |
Medical Aesthetics | Developed Technology |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  | 576,900,000 |
Medical Aesthetics | Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  | 9,800,000 |
Forward foreign currency contracts |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative contract period, or less |  |  |  |  |  |  |  |  | 1 year |  |  |
Interest rate caps - derivative |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  |  |  |  |  |  |  |  | $ 500,000 | 2,300,000 | 3,100,000 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  |  |  |  |  |  |  |  | $ 400,000 | $ (500,000) | $ (8,000,000.0) |

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