Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended	12 Months Ended			23 Months Ended
	Oct. 31, 2014	Jun. 26, 2016	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014	Oct. 02, 2016
Business Acquisition [Line Items]
Finite-lived intangible assets, amortization expense						$ 57.3	$ 50.0	$ 8.7
Finite-lived intangible assets, accumulated amortization			$ 78.1		$ 78.1	148.1	78.1		$ 148.1
Gain resulting from acquisition of joint venture						0.0	390.6	0.0
Acquired and reacquired rights [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, accumulated amortization			52.5		$ 52.5	$ 114.5	$ 52.5		114.5
Germany Retail Operations [Member]
Business Acquisition [Line Items]
Total proceeds from sale of retail store assets and operations		$ 47.3
Gain/(loss) resulting from divestiture						insignificant
Puerto Rico Retail Operations [Member]
Business Acquisition [Line Items]
Total proceeds from sale of retail store assets and operations			$ 8.9
Gain/(loss) resulting from divestiture			insignificant
Starbucks Coffee Japan Ltd [Member]
Business Acquisition [Line Items]
Preexisting ownership percentage			39.50%		39.50%		39.50%
Remaining Ownership Interest in Equity Method Investee to be Acquired			60.50%		60.50%		60.50%
Additional ownership interest acquired	39.50%
Cash paid to acquire additional ownership interest	$ 508.7				$ 362.0		$ 876.0
Acquisition date	Oct. 31, 2014
Reason for acquisition							Acquiring Starbucks Japan further leverages our existing infrastructure to continue disciplined retail store growth and expand our presence into other channels in the Japan market, such as consumer packaged goods ("CPG"), licensing and foodservice
Remaining interest of minority shareholders' to be acquired	21.00%
Finite-lived intangible assets, amortization expense						$ 48.2
Finite-lived intangible assets, accumulated amortization						101.6			101.6
Acquired finite-lived intangible assets, amortization expense, next twelve months						52.0			52.0
Acquired finite-lived intangible assets, amortization expense, year two						52.0			52.0
Acquired finite-lived intangible assets, amortization expense, year three						52.0			52.0
Acquired finite-lived intangible assets, amortization expense, year four						52.0			52.0
Acquired finite-lived intangible assets, amortization expense, year five						27.0			27.0
Acquired finite-lived intangible assets, amortization expense, after year five						6.0			6.0
Goodwill	$ 815.6					$ 870.9
Goodwill description	the intangible assets that do not qualify for separate recognition and primarily includes the acquired customer base, the acquired workforce including store partners in the region that have strong relationships with these customers, the existing geographic retail and online presence, and the expected geographic presence in new channels
Goodwill, effect of foreign currency translation									$ 55.3
Gain resulting from acquisition of joint venture							$ 390.6
Fair value of preexisting equity interest	$ 577.0
Revenue included in consolidated statements of earnings							1,100.0
Net earnings included in consolidated statements of earnings							108.5
Pro forma revenue							19,254.5	17,646.4
Pro forma net earnings attributable to Starbucks							2,380.9	$ 2,449.9
Transaction and integration costs							$ 13.6
Starbucks Coffee Japan Ltd [Member] | Acquired and reacquired rights [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 305.0
Australia Retail Operations [Member]
Business Acquisition [Line Items]
Total proceeds from sale of retail store assets and operations			$ 15.9
Gain/(loss) resulting from divestiture				insignificant