Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	Sep. 29, 2019	Sep. 30, 2018
Three Point Eight Five Percentage Senior Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Face value of Senior Notes	$ 750.0	$ 750.0
Stated Interest Rate	3.85%
Two Point One Percentage Senior Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Face value of Senior Notes	$ 500.0	500.0
Face amount from reopening of previous Senior Notes	$ 250.0	250.0
Stated Interest Rate	2.10%
Two Point Four Five Percentage Senior Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Face value of Senior Notes	$ 500.0	$ 500.0
Stated Interest Rate	2.45%

Face (par) amount of debt instrument from reopening of previous debt issuance.

No definition available.

Name:	sbux_DebtInstrumentFaceAmountfromReopeningofPreviousIssuance
Namespace Prefix:	sbux_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=sbux_ThreePointEightFivePercentageSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sbux_TwoPointOnePercentageSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sbux_TwoPointFourFivePercentageSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: