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Summary of Significant Accounting Policies (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 26, 2018 USD ($) | Jun. 28, 2020 USD ($) store | Sep. 27, 2020 USD ($) store | Sep. 29, 2019 USD ($) | Sep. 30, 2018 USD ($) | Oct. 01, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | $ 254,700,000 |  |  |
Employee-related Liabilities, Current |  |  | 696,000,000.0 | $ 664,600,000 |  |
Operating Lease, Liability, Current |  |  | $ 1,248,800,000 | 0 |  |
Property, Plant and Equipment |  |  | Property, Plant and Equipment Property, plant and equipment is carried at cost less accumulated depreciation. Cost includes all direct costs necessary to acquire and prepare assets for use, including internal labor and overhead in some cases. Depreciation is computed using the straight-line method over estimated useful lives of the assets, generally ranging from 2 to 15 years for equipment and 30 to 40 years for buildings. Leasehold improvements are amortized over the shorter of their estimated useful lives or the related lease life, generally 10 years. For leases with renewal periods at our option, we generally use the original lease term, excluding renewal option periods, to determine estimated useful lives. If failure to exercise a renewal option imposes an economic penalty to us, we may determine at the inception of the lease that renewal is reasonably assured and include the renewal option period in the determination of the appropriate estimated useful lives. The portion of depreciation expense related to production and distribution facilities is included in product and distribution costs on our consolidated statements of earnings. The costs of repairs and maintenance are expensed when incurred, while expenditures for refurbishments and improvements that significantly add to the productive capacity or extend the useful life of an asset are capitalized. When assets are disposed of, whether through retirement or sale, the net gain or loss is recognized in net earnings. Long-lived assets to be disposed of are reported at the lower of their carrying amount or fair value less estimated costs to sell. We evaluate property, plant and equipment for impairment when facts and circumstances indicate that the carrying values of such assets may not be recoverable. When evaluating for impairment, we first compare the carrying value of the asset to the asset’s estimated future undiscounted cash flows. If the estimated undiscounted future cash flows are less than the carrying value of the asset, we determine if we have an impairment loss by comparing the carrying value of the asset to the asset's estimated fair value and recognize an impairment charge when the asset’s carrying value exceeds its estimated fair value. The fair value of the asset is estimated using a discounted cash flow model based on forecasted future revenues and operating costs, using internal projections. Property, plant and equipment assets and ROU assets related to the store lease are grouped at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. For company-operated store assets, the impairment test is performed at the individual store asset group level. We recognized net disposition charges of $84.9 million, $64.6 million and $32.8 million in fiscal 2020, 2019 and 2018, respectively. Additionally, we recognized net impairment charges of $210.0 million, $43.4 million and $42.8 million in fiscal 2020, 2019 and 2018, respectively. Of the total net impairment charges, $134.6 million, $7.1 million and $37.0 million in fiscal 2020, 2019 and 2018, respectively, were restructuring related and recorded in restructuring and impairment expenses. For fiscal 2020, we evaluated initial COVID-19 business recovery trends and their estimated impacts on future revenue growth and profitability for assessing impairment of our company-operated retail store and related operating lease right-of-use assets. As a result, we recorded $59.6 million of impairment losses within store operating expenses on our consolidated statement of earnings during the year ended September 27, 2020. Unless it is restructuring related, the nature of the underlying asset that is impaired or disposed of will determine the operating expense line on which the related impact is recorded on our consolidated statements of earnings. |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  | $ 84,900,000 | 64,600,000 | $ 32,800,000 |
Impairment of Long-Lived Assets Held-for-use |  |  | $ 210,000,000.0 | 43,400,000 | 42,800,000 |
Summary of Significant Accounting Policies [Abstract] |  |  |  |  |  |
Number of Reportable Segments |  |  | 3 |  |  |
Goodwill impairments |  |  | $ 0 | 10,500,000 | 37,600,000 |
Government subsidies receivables |  |  | 155,100,000 | 0 |  |
Accounts Receivable, after Allowance for Credit Loss [Abstract] |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current |  |  | 27,100,000 | 6,700,000 |  |
Inventory Disclosure [Abstract] |  |  |  |  |  |
Inventory Valuation Reserves |  |  | 48,400,000 | 33,700,000 |  |
Asset Retirement Obligation [Abstract] |  |  |  |  |  |
Capitalized Costs, Asset Retirement Costs |  |  | 30,700,000 | 23,500,000 |  |
Asset Retirement Obligations, Noncurrent |  |  | 111,000,000.0 | 95,500,000 |  |
Marketing and Advertising Expense [Abstract] |  |  |  |  |  |
Advertising Expense |  |  | 258,800,000 | 245,700,000 | 260,300,000 |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Deferred Revenue | $ 7,000,000,000 |  |  |  |  |
Prepaid Royalty Economic Life | 40 years |  |  |  |  |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  | 155,900,000 |
Deferred Revenue, Current |  |  | 1,456,500,000 | 1,269,000,000.0 |  |
Deferred Revenue, Revenue Recognized |  |  | (176,800,000) | (175,200,000) |  |
Operating Lease, Liability, Current |  |  | 1,248,800,000 | 0 |  |
Employee-related Liabilities, Current |  |  | 696,000,000.0 | 664,600,000 |  |
Derivative, Collateral, Obligation to Return Cash |  |  | 34,900,000 |  |  |
Payroll Tax Incentives |  |  | 349,600,000 |  |  |
Deferred Payroll Tax Payments |  |  | $ 151,000,000.0 |  |  |
Identified Store Closures | store |  |  | 405 |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | $ 254,700,000 |  |  |
Restructuring Charges [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  | 134,600,000 | 7,100,000 | 37,000,000.0 |
Store Operating Expense [Member] |  |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |  |
Asset Impairment Charges |  |  | 59,600,000 |  |  |
Trade Names, trademarks and patents [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring Costs and Asset Impairment Charges |  | $ 22,100,000 | 22,100,000 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring Costs and Asset Impairment Charges |  | $ 22,100,000 | 22,100,000 |  |  |
Maximum [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | $ 400,000,000 |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Timing of Store Closures |  |  | 6 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | $ 400,000,000 |  |  |
Minimum [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | $ 260,000,000 |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Timing of Store Closures |  |  | 3 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | $ 260,000,000 |  |  |
Leasehold Improvements [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |  |
Building [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 40 years |  |  |
Building [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 30 years |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 15 years |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 2 years |  |  |
Contract Termination [Member] | Restructuring Charges [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Business Exit Costs |  |  |  | 55,300,000 | 119,300,000 |
Restructuring and Related Cost, Cost Incurred to Date |  |  | $ 87,700,000 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 87,700,000 |  |  |
Facility Closing [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 151,600,000 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 151,600,000 |  |  |
Facility Closing [Member] | Maximum [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | 190,000,000 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | 190,000,000 |  |  |
Facility Closing [Member] | Minimum [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | 150,000,000 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | 150,000,000 |  |  |
Lease Termination [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 87,700,000 |  |  |
Operating Lease, Liability, Current |  |  | 80,000,000.0 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Operating Lease, Liability, Current |  |  | 80,000,000.0 |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 87,700,000 |  |  |
Lease Termination [Member] | Maximum [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | 190,000,000 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | 190,000,000 |  |  |
Lease Termination [Member] | Minimum [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | 100,000,000 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  | 100,000,000 |  |  |
Employee Severance [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 15,400,000 |  |  |
Employee-related Liabilities, Current |  |  | 15,200,000 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Employee-related Liabilities, Current |  |  | 15,200,000 |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  |  | 15,400,000 |  |  |
Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member] |  |  |  |  |  |
Deferred Revenue, Other |  |  | 7,000,000.0 | (20,800,000) |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Deferred Revenue |  |  | 1,280,500,000 | 1,113,700,000 | $ 1,328,600,000 | $ 970,600,000
Deferred Revenue, Additions |  |  | 10,527,700,000 | 10,983,600,000 |  |
Deferred Revenue, Current |  |  | 1,200,000,000 | 1,000,000,000.0 |  |
Deferred Revenue, Revenue Recognized |  |  | 10,367,900,000 | 10,819,700,000 |  |
International [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Rent Concession |  |  | $ 27,600,000 |  |  |
US and Canada [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of Store Closures | store |  | 600 | 800 |  |  |
Increase of Number of Store Closures | store |  |  | 200 |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Number of Store Closures | store |  | 600 | 800 |  |  |
Increase of Number of Store Closures | store |  |  | 200 |  |  |
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 |  |  | $ 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 |  |  | 14,300,000 | 15,700,000 |  |
Nestle Global Coffee Alliance [Member] |  |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |  |
Deferred Revenue | $ 7,000,000,000 |  |  |  |  |
Deferred Revenue, Current |  |  | $ 179,300,000 | $ 175,900,000 |  |

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