Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended		9 Months Ended	12 Months Ended	17 Months Ended
	Oct. 31, 2014	Mar. 27, 2016	Dec. 27, 2015	Mar. 29, 2015	Dec. 28, 2014	Mar. 27, 2016	Mar. 29, 2015	Sep. 27, 2015	Sep. 27, 2015	Mar. 27, 2016	Sep. 28, 2014
Business Acquisition [Line Items]
Gain resulting from acquisition of joint venture		$ 0.0		$ 0.0		$ 0.0	$ 390.6
Spain JV [Member]
Business Acquisition [Line Items]
Ownership interest sold to joint venture partner			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	$ 509.0							$ 362.0	$ 876.0
Acquisition date	Oct. 31, 2014
Goodwill, effect of foreign currency translation										$ (35.9)
Intangible assets, effect of foreign currency translation										(14.2)
Goodwill		779.7
Intangible assets, acquired		308.8
Intangible assets, accumulated amortization		$ 67.3				$ 67.3				$ 67.3
Gain resulting from acquisition of joint venture					$ 390.6