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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 02, 2017 USD ($) | Sep. 30, 2018 USD ($) | Oct. 01, 2017 USD ($) | Oct. 02, 2016 USD ($)
Accounting Policies [Abstract] |  |  |  |
Stored Value Cards and Loyalty Program |  | $ 155,900,000 | $ 104,600,000 | $ 60,500,000
Number of reportable operating segments |  | 4 |  |
Derivative [Line Items] |  |  |  |
Goodwill, Impairment Loss |  | $ 37,600,000 | 87,200,000 | 0
Derivative asset, cash collateral |  | 5,400,000 |  |
Derivative, Collateral, Obligation to Return Cash |  |  | 5,800,000 |
Derivative contract, potential effects of netting, reduction in value |  | 5,500,000 | 7,400,000 |
Derivative asset |  | 29,400,000 | 30,000,000 |
Derivative liability |  | 44,500,000 | 31,100,000 |
Receivables, net of Allowance for Doubtful Accounts |  |  |  |
Allowance for doubtful accounts |  | 8,000,000 | 9,800,000 |
Inventories |  |  |  |
Inventory reserves |  | 41,500,000 | 38,400,000 |
Property, Plant and Equipment [Line Items] |  |  |  |
Net disposition charges on property, plant and equipment |  | (32,800,000) | (46,900,000) | (25,100,000)
Net impairment charges on property, plant and equipment |  | 42,800,000 | 56,100,000 | 24,100,000
Marketing & Advertising |  |  |  |
Advertising expenses |  | 260,300,000 | 282,600,000 | $ 248,600,000
Asset Retirement Obligations |  |  |  |
Net ARO assets included in property, plant and equipment |  | 19,100,000 | 12,400,000 |
Net ARO liabilities included in other long-term liabilities |  | $ 82,400,000 | 70,000,000 |
Equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 2 years |  |
Equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 15 years |  |
Buildings [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 30 years |  |
Buildings [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 40 years |  |
Leasehold improvements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment, in years |  | 10 years |  |
Commodity Contract [Member] | Maximum [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments maturity, in years |  | 3 years |  |
Teavana [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Goodwill, Impairment Loss | $ 69,300,000 |  |  |
Starbucks Coffee Switzerland [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Goodwill, Impairment Loss | $ 17,900,000 | $ 37,600,000 |  |
Restructuring Charges [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net impairment charges on property, plant and equipment |  | $ 37,000,000 | $ 39,900,000 |

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