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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2018 | Sep. 27, 2019 | Oct. 02, 2020 | Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax expense (benefit) measurement period adjustment | $ 144,400 | $ 89,700 |  |  |  |
Change in tax rate effect on income tax expense |  |  |  | $ 24,400 |  |
Income tax expense resulting from the differential of the losses netted again uncertain tax positions |  |  | $ 14,300 |  |  |
Stockholders' equity |  | 5,714,691 | 5,815,712 | 5,714,691 |  |
Valuation allowance |  | 153,257 | 140,578 | 153,257 |  |
Change in deferred tax assets valuation allowance, amount |  |  | 0 | (207) | $ 104,221 |
Change in deferred tax asset valuation |  |  | (12,700) |  |  |
Net operating losses |  | 241,033 | 197,987 | 241,033 |  |
Repatriation of foreign earnings, income tax expense |  |  | 16,200 |  |  |
Gross unrecognized tax benefits |  | 104,355 | 102,484 | 104,355 | $ 179,140 | $ 38,580
Unrecognized tax benefits that would impact effective tax rate |  |  | 86,200 |  |  |
Accrued interest and penalties |  | 51,100 | 40,400 | 51,100 |  |
Decrease in unrecognized tax benefits |  |  | 5,500 |  |  |
Foreign Country |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Loss carry forwards of foreign subsidiaries |  | 945,100 | 783,900 | 945,100 |  |
Foreign Country | United Kingdom |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Change in deferred tax assets valuation allowance, amount |  |  | (15,100) |  |  |
Expiring Between 2018 and 2037 | Foreign Country |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Loss carry forwards of foreign subsidiaries |  |  | 87,300 |  |  |
Accounting Standards Update 2013-11 |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Gross unrecognized tax benefits |  | 85,200 | 93,400 | 85,200 |  |
Accounting Standards Update 2013-11 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Gross unrecognized tax benefits |  | $ 19,200 | 9,100 | $ 19,200 |  |
Retained Earnings | Accounting Standards Update 2018-02 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  | 10,200 |  |  |
Current Year Activity |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Change in deferred tax assets valuation allowance, amount |  |  | $ 2,400 |  |  |

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