Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended	12 Months Ended	14 Months Ended
	Oct. 31, 2014	Dec. 27, 2015	Dec. 28, 2014	Sep. 27, 2015	Sep. 27, 2015	Dec. 27, 2015	Sep. 28, 2014
Business Acquisition [Line Items]
Gain resulting from acquisition of joint venture		$ 0.0	$ 390.6
Spain JV [Member]
Business Acquisition [Line Items]
Ownership interest sold to joint venture partner		49.00%				49.00%
Purchase price of joint venture sold		$ 30.2
Gain resulting from divestiture		0.6
Starbucks Coffee Japan Ltd Member
Business Acquisition [Line Items]
Preexisting ownership percentage in Starbucks Japan							39.50%
Remaining Ownership Interest in Equity Method Investee to be Acquired							60.50%
Cash paid to acquire additional ownership interest in Starbucks Japan	$ 508.7			$ 362.0	$ 876.0
Acquisition date	Oct. 31, 2014
Goodwill, effect of foreign currency translation						$ (86.3)
Intangible assets, effect of foreign currency translation						(34.2)
Goodwill		729.3
Intangible assets, acquired		288.8
Intangible assets, accumulated amortization		$ 51.8				$ 51.8
Gain resulting from acquisition of joint venture			$ 390.6