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Summary of Significant Accounting Policies (Narrative) (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 26, 2018 USD ($) | Sep. 28, 2025 USD ($) Reportable_segment | Sep. 29, 2024 USD ($) | Oct. 01, 2023 USD ($) | Sep. 27, 2026 USD ($)
Summary of Significant Accounting Policies [Abstract] |  |  |  |  |
Number of Reportable Segments | Reportable_segment |  | 3 |  |  |
Retained Earnings (Accumulated Deficit) |  | $ (8,272,500,000) | $ (7,343,800,000) |  |
Goodwill impairments |  | 0 | 0 | $ 0 |
Accounts Receivable, after Allowance for Credit Loss [Abstract] |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Current |  | 24,000,000.0 | 21,200,000 |  |
Inventory Disclosure [Abstract] |  |  |  |  |
Inventory Valuation Reserves |  | 56,600,000 | 58,000,000.0 |  |
Asset Retirement Obligation [Abstract] |  |  |  |  |
Capitalized Costs, Asset Retirement Costs |  | 25,500,000 | 25,100,000 |  |
Asset Retirement Obligations, Noncurrent |  | 126,300,000 | 119,200,000 |  |
Marketing and Advertising Expense [Abstract] |  |  |  |  |
Advertising Expense |  | 869,500,000 | 597,300,000 | 507,800,000 |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Deferred Revenue | $ 7,000,000,000 |  |  |  |
Prepaid Royalty Economic Life | 40 years |  |  |  |
Deferred Revenue, Current |  | 1,840,600,000 | 1,781,200,000 |  |
Deferred Revenue, Revenue Recognized |  | 176,500,000 | 176,500,000 | 176,500,000 |
Restructuring and Related Cost, Expected Cost |  | 1,000,000,000.0 |  |  | $ 230,000,000
Operating Lease, Liability, Current |  | 1,564,500,000 | 1,463,100,000 |  |
Accrued payroll and benefits |  | 1,093,900,000 | 786,600,000 |  |
Margin Deposit Assets |  | 37,900,000 | 12,400,000 |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Net disposition and impairment charges |  | 595,300,000 | 94,000,000.0 | 91,100,000 |
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset |  | 187,000,000.0 | 230,900,000 |  |
Disposal and impairment of store assets |  | 352,800,000 |  |  |
Amortization of ROU lease assets and other lease exit costs |  | 239,300,000 |  |  |
Store Operating Expense [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Asset Impairment Charges |  | 102,200,000 | 23,300,000 | 23,200,000 |
Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Deferred Revenue, Current |  | $ 1,600,000,000 | 1,600,000,000 |  |
Leasehold Improvements [Member] |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |
Minimum [Member] | Building [Member] |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 30 years |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 30 years |  |  |
Minimum [Member] | Equipment [Member] |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 2 years |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 2 years |  |  |
Minimum [Member] | Capitalized Asset |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 2 years |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 2 years |  |  |
Maximum [Member] | Building [Member] |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |  |
Maximum [Member] | Equipment [Member] |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 15 years |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 15 years |  |  |
Maximum [Member] | Capitalized Asset |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 8 years |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 8 years |  |  |
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 |  | $ 200,400,000 | 187,600,000 | 196,100,000 |
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 |  | 22,000,000.0 | 20,000,000.0 | $ 18,900,000 |
Nestle Global Coffee Alliance [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Deferred Revenue, Current |  | $ 177,000,000.0 | $ 177,000,000 |  |

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