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Equity and Cost Investments (Equity Method Investments) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Oct. 02, 2016
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 296.0 | $ 432.8 |
Revenues generated from related parties | 112.8 | 187.3 | $ 164.2
Related costs of sales | 71.5 | 109.3 | $ 97.5
Accounts receivables from equity method investees | 41.2 | 54.3 |
Cost Method Investments | $ 38.7 | 48.8 |
Starbucks Coffee Korea Co., Ltd. [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Preexisting ownership percentage | 50.00% |  |
Tata Starbucks Limited (India) [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Preexisting ownership percentage | 50.00% |  |
North American Coffee Partnership [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Preexisting ownership percentage | 50.00% |  |
Company Store Investees [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Cost Method Investments | $ 23.0 | $ 23.0 |

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