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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2020 | Dec. 29, 2018 | Sep. 29, 2018 | Mar. 31, 2018 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Income Taxes [Line Items] |  |  |  |  |  |  |
Provisional estimate of tax benefit as result of Tax Cuts and Jobs Act |  | $ 341,200,000 | $ 346,400,000 |  |  |  | $ 346,200,000
Decrease in valuation allowance |  |  |  |  | $ (57,800,000) |  |
Net operating losses | $ 32,200,000 |  |  |  | 32,200,000 |  |
Federal net operating loss expected to be expired unutilized | 4,500,000 |  |  |  | 4,500,000 |  |
State net operating loss expected to be expired unutilized | 74,600,000 |  |  |  | 74,600,000 |  |
Foreign net operating loss expected to be expired unutilized | 47,200,000 |  |  |  | 47,200,000 |  |
Gross unrecognized tax benefits, excluding interest | 197,100,000 |  |  |  | 197,100,000 | $ 101,600,000 |
Unrecognized tax benefit that would impact effective tax rate | 184,900,000 |  |  |  | 184,900,000 | 87,300,000 |
Change in gross unrecognized tax benefits |  |  |  |  |  | 95,500,000 |
Interest accrued on unrecognized tax benefits | 11,900,000 |  |  |  | 11,900,000 | 11,100,000 |
Income tax penalties accrued | 0 |  |  |  | 0 |  |
Increase in deferred tax assets resulting from adoption of ASU 2016-16 |  |  |  |  | 2,900,000 |  |
Decease in accumulated deficit resulting from adoption of ASU 2016-16 |  |  |  |  | 2,500,000 |  |
Decease to prepaid taxes resulting from adoption of ASU 2016-16 |  |  |  |  | 400,000 |  |
Increase to income tax expense adoption of ASU 2016-16 |  |  |  |  | 27,800,000 |  |
Decrease in deferred tax liabilities due to ASU 2016-16 |  |  |  |  | 37,700,000 |  |
Increase to Net Income resulted from adoption of ASU 2016-16 |  |  |  |  | $ 9,900,000 |  |
Increase to Earnings per Share resulted from adoption of ASU 2016-16 |  |  |  |  | $ 0.04 |  |
state loss carryforward expected to unutilize | 26,100,000 |  |  |  | $ 26,100,000 |  |
Capital losses | 57,000,000.0 |  |  |  | 57,000,000.0 | $ 6,400,000 |
Gross state loss carryforwards | 0.0 |  |  |  | 0.0 |  |
Gross foreign loss carryforwards | 32,200,000 |  |  |  | 32,200,000 |  |
Medical Aesthetics |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Other Tax Expense (Benefit) |  |  |  |  | 313,400,000 |  |
General and Administrative Expense |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Non-income tax loss | (2,900,000) |  |  | $ (4,000,000.0) |  |  |
Net Operating Losses Carryforwards |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Amount with unlimited carry forward periods |  |  |  |  | 22,500,000 |  |
Tax Credit Carryforward |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Amount with unlimited carry forward periods |  |  |  |  | 3,400,000 |  |
Maximum |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Decrease in unrecognized tax benefits is reasonably possible | 1,300,000 |  |  |  | 1,300,000 |  |
Domestic Tax Authority |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating losses | 40,100,000 |  |  |  | 40,100,000 |  |
Credit carry forwards | 5,000,000.0 |  |  |  | 5,000,000.0 |  |
State and Local Jurisdiction |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating losses | 44,500,000 |  |  |  | 44,500,000 |  |
Credit carry forwards | 4,500,000 |  |  |  | 4,500,000 |  |
Foreign Tax Authority |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating losses | 207,100,000 |  |  |  | 207,100,000 |  |
Credit carry forwards | $ 1,200,000 |  |  |  | $ 1,200,000 |  |

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