Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 29, 2013
Net earnings including noncontrolling interests	$ 2,759.3	$ 2,067.7	$ 8.8
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(224.7)	(41.7)	44.3
Comprehensive income including noncontrolling interests	2,534.6	2,026.0	53.1
Comprehensive income/(loss) attributable to noncontrolling interests	(29.2)	(0.4)	0.5
Comprehensive income attributable to Starbucks	2,563.8	2,026.4	52.6
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	1.4	1.6	(0.6)
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(0.5)	(0.6)	0.2
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	47.6	24.1	47.1
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(16.8)	(7.8)	(24.6)
Net Investment Hedges [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	4.3	25.5	32.8
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(1.6)	(9.4)	(12.1)
Translation Adjustment [Member]
Other comprehensive income/(loss), net of tax:
Translation adjustment, before tax	(222.7)	(75.8)	(41.6)
Translation adjustment, tax (expense)/benefit	6.0	(1.6)	0.3
Other comprehensive income/(loss)	(171.3)	(77.4)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income/(loss), net of tax:
Reclassification adjustment for net gains (losses) realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, before tax	(65.9)	(1.5)	46.3
Reclassification adjustment for net gains (losses) realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 23.5	$ 3.8	$ (3.5)