Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended			12 Months Ended			35 Months Ended
	Oct. 31, 2014	Oct. 01, 2017	Jun. 26, 2016	Sep. 27, 2015	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015	Oct. 01, 2017
Business Acquisition [Line Items]
Finite-lived intangible assets, amortization expense					$ 57.5	$ 57.3	$ 50.0
Finite-lived intangible assets, accumulated amortization		$ 194.8			194.8	148.1		$ 194.8
Gain resulting from acquisition of joint venture					0.0	0.0	$ 390.6
Finite-Lived Intangible Assets, Amortization Expense, Year Five		8.0			8.0			8.0
Thereafter		10.3			10.3			10.3
Acquired and reacquired rights [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, accumulated amortization		154.2			$ 154.2	$ 114.5		$ 154.2
Singapore Retail Operations [Member]
Business Acquisition [Line Items]
Total proceeds from sale of retail store assets and operations		$ 119.9
Gain/(loss) resulting from divestiture		83.9
East China JV [Member]
Business Acquisition [Line Items]
Preexisting ownership percentage		50.00%			50.00%			50.00%
Payments to Acquire Interest in Joint Venture		$ 1,300.0
Taiwan JV [Member]
Business Acquisition [Line Items]
Preexisting ownership percentage		50.00%			50.00%			50.00%
Proceeds from Divestiture of Interest in Joint Venture		$ 175.0
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%
Remaining Ownership Interest in Equity Method Investee to be Acquired						60.50%
Cash paid to acquire additional ownership interest	$ 508.7					$ 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 CPG, licensing and foodservice
Finite-lived intangible assets, amortization expense					$ 48.4
Finite-lived intangible assets, accumulated amortization		139.1			139.1			$ 139.1
Acquired finite-lived intangible assets, amortization expense, next twelve months		47.0			47.0			47.0
Acquired finite-lived intangible assets, amortization expense, year two		47.0			47.0			47.0
Acquired finite-lived intangible assets, amortization expense, year three		47.0			47.0			47.0
Acquired finite-lived intangible assets, amortization expense, year five		24.0			24.0			24.0
Finite-Lived Intangible Amortization, after Year Four		$ 5.0			$ 5.0			5.0
Goodwill	$ 815.6							783.4
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								$ (32.2)
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
Pro forma net earnings attributable to Starbucks							$ 2,380.9
Starbucks Coffee Japan Ltd [Member] | Acquired and reacquired rights [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 305.0