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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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