Summary of Significant Accounting Policies (Narrative) (Details)		12 Months Ended
	Aug. 26, 2018 USD ($)	Oct. 03, 2021 USD ($) store	Sep. 27, 2020 USD ($)	Sep. 29, 2019 USD ($)	Sep. 28, 2020 USD ($)
Retained Earnings (Accumulated Deficit)		$ (6,315,700,000)	$ (7,815,600,000)
Goodwill impairments		0	0	$ 10,500,000
Government subsidies receivables		172,400,000	155,100,000
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current		25,600,000	27,100,000
Inventory Disclosure [Abstract]
Inventory Valuation Reserves		36,600,000	48,400,000
Asset Retirement Obligation [Abstract]
Capitalized Costs, Asset Retirement Costs		30,900,000	30,700,000
Asset Retirement Obligations, Noncurrent		116,500,000	111,000,000
Marketing and Advertising Expense [Abstract]
Advertising Expense		305,100,000	258,800,000	245,700,000
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue	$ 7,000,000,000
Prepaid Royalty Economic Life	40 years
Deferred Revenue, Current		1,596,100,000	1,456,500,000
Deferred Revenue, Revenue Recognized		176,600,000	176,800,000	175,200,000
Restructuring and Related Cost, Incurred Cost		155,400,000	254,700,000
Operating Lease, Liability, Current		1,251,300,000	1,248,800,000
Accrued payroll and benefits		772,300,000	696,000,000.0
Derivative, Collateral, Obligation to Return Cash		44,700,000	34,900,000
Payroll Tax Incentives		210,000,000	349,600,000
Deferred Payroll Tax Payments		81,700,000
Deferred Payroll Tax Payments, Current		116,400,000
Deferred Payroll Tax Payments, Noncurrent		116,400,000	151,000,000
Lessee, Lease, Description [Line Items]
Restructuring and Related Cost, Incurred Cost		155,400,000	254,700,000
Accrued payroll and benefits		772,300,000	696,000,000.0
Operating Lease, Liability, Current		1,251,300,000	1,248,800,000
Property, Plant and Equipment [Line Items]
Net disposition and impairment charges		153,100,000	294,900,000	108,000,000
Trade Names, trademarks and patents [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Restructuring Costs and Asset Impairment Charges			22,100,000
Lessee, Lease, Description [Line Items]
Restructuring Costs and Asset Impairment Charges			22,100,000
Restructuring Charges [Member]
Property, Plant and Equipment [Line Items]
Net disposition and impairment charges		53,100,000	151,000,000	7,300,000
Store Operating Expense [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges		44,400,000	59,600,000
Contract Termination [Member] | Restructuring Charges [Member]
Lessee, Lease, Description [Line Items]
Business Exit Costs				55,300,000
Facility Closing [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Restructuring and Related Cost, Incurred Cost		53,100,000	151,000,000
Lessee, Lease, Description [Line Items]
Restructuring and Related Cost, Incurred Cost		53,100,000	151,000,000
Lease Termination [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Restructuring and Related Cost, Incurred Cost		89,500,000	87,700,000
Lessee, Lease, Description [Line Items]
Restructuring and Related Cost, Incurred Cost		89,500,000	87,700,000
Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue, Current		$ 1,300,000,000	1,200,000,000
Leasehold Improvements [Member]
Lessee, Lease, Description [Line Items]
Property, Plant and Equipment, Useful Life		10 years
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		10 years
Building [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Property, Plant and Equipment, Useful Life		30 years
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		30 years
Building [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Property, Plant and Equipment, Useful Life		40 years
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		40 years
Equipment [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Property, Plant and Equipment, Useful Life		2 years
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		2 years
Equipment [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Property, Plant and Equipment, Useful Life		15 years
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		15 years
Accounting Standards Update 2016-13
Retained Earnings (Accumulated Deficit)					$ 2,200,000
International [Member]
Lessee, Lease, Description [Line Items]
Rent Concession			27,600,000
US and Canada [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Number of Store Closures | store		807
Lessee, Lease, Description [Line Items]
Number of Store Closures | store		807
Company-operated stores [Member] | Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract with Customer, Liability, Revenue Recognized		$ 164,500,000	130,300,000	125,100,000
Licensed stores [Member] | Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract with Customer, Liability, Revenue Recognized		16,600,000	14,300,000	$ 15,700,000
Nestle Global Coffee Alliance [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue, Current		$ 177,000,000	$ 179,300,000