Inventories (Components of Inventory) (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2014	Sep. 28, 2014	Dec. 29, 2013
Inventory Disclosure [Abstract]
Unroasted coffee	$ 414.2sbux_UnroastedCoffeeInventory	$ 432.3sbux_UnroastedCoffeeInventory	$ 407.6sbux_UnroastedCoffeeInventory
Roasted coffee	227.2sbux_RoastedCoffeeInventory	238.9sbux_RoastedCoffeeInventory	203.7sbux_RoastedCoffeeInventory
Other merchandise held for sale	230.2	265.7	198.8
Packaging and other supplies	146.7us-gaap_OtherInventoryNetOfReserves	154.0us-gaap_OtherInventoryNetOfReserves	133.2us-gaap_OtherInventoryNetOfReserves
Total	$ 1,018.3us-gaap_InventoryNet	$ 1,090.9us-gaap_InventoryNet	$ 943.3us-gaap_InventoryNet

Carrying amount as of the balance sheet date of roasted coffee held by the company.

No definition available.

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- Definition

Carrying amount as of the balance sheet date of unroasted coffee held by the company.

+ References

No definition available.

+ Details

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- Details

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a))

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-Topic 330

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-Section 35

-Paragraph 2

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-Publisher FASB

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-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (b)

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- Definition

Carrying amount, net of valuation reserves and allowances, as of the balance sheet date of inventories not otherwise specified in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.BB)

-URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Carrying amount as of the balance sheet date of merchandise inventory purchased by a retailer, wholesaler or distributor and held for future sale.

+ References

+ Details

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