Acquisitions and Divestitures (Finite-lived intangible assets acquired) (Details) - USD ($) $ in Millions	Sep. 27, 2015	Sep. 28, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 380.6	$ 89.8
Accumulated amortization	(78.1)	(28.9)
Net carrying amount	302.5	60.9
Acquired and reacquired rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	308.6	36.8
Accumulated amortization	(52.5)	(10.1)
Net carrying amount	256.1	26.7
Licensing agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	13.4	0.0
Accumulated amortization	(1.1)	0.0
Net carrying amount	12.3	$ 0.0
Starbucks Coffee Japan Ltd [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	289.3
Accumulated amortization	(40.7)
Net carrying amount	248.6
Starbucks Coffee Japan Ltd [Member] | Acquired and reacquired rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	273.2
Accumulated amortization	(39.0)
Net carrying amount	234.2
Starbucks Coffee Japan Ltd [Member] | Licensing agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	13.4
Accumulated amortization	(1.1)
Net carrying amount	12.3
Starbucks Coffee Japan Ltd [Member] | Customer loyalty program [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2.7
Accumulated amortization	(0.6)
Net carrying amount	$ 2.1