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Equity and Cost Investments (Cost Method Investments) (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Oct. 01, 2017
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Schedule of Cost and Equity Method Investments [Line Items] |  |
Cost Method Investments | $ 38.7 | $ 48.8
Company Store Investees [Member] |  |
Schedule of Cost and Equity Method Investments [Line Items] |  |
Cost Method Investments | $ 23.0 | $ 23.0

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- Definition [Line Items] for Summarization of information required and determined to be disclosed concerning all cost-method and equity-method investments. + References No definition available. + Details
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Namespace Prefix: | sbux_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |