Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Net earnings including noncontrolling interests	$ 626.5	$ 512.5	$ 2,106.8	$ 1,480.2
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(14.2)	6.6	(156.4)	3.9
Comprehensive income including noncontrolling interests	612.3	519.1	1,950.4	1,484.1
Comprehensive income/(loss) attributable to noncontrolling interests	(0.2)	(0.1)	(29.2)	(0.1)
Comprehensive income attributable to Starbucks	612.5	519.2	1,979.6	1,484.2
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	(1.8)	1.7	0.3	0.8
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	0.7	(0.6)	(0.1)	(0.2)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on derivatives, before tax	33.9	(13.8)	97.8	6.1
Unrealized gains/(losses) on derivatives, tax (expense)/benefit	(8.8)	3.6	(24.2)	(2.4)
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on derivatives, before tax	0.0	(0.7)	4.3	5.2
Unrealized gains/(losses) on derivatives, tax (expense)/benefit	0.0	0.3	(1.6)	(1.9)
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(1.6)	1.1	(0.8)	0.8
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(1.6)	(11.7)	(1.3)	8.3
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	0.0	(0.4)	(1.9)	3.3
Translation Adjustment [Member]
Other comprehensive income/(loss), net of tax:
Translation adjustment, before tax	(6.0)	19.8	(169.3)	(2.9)
Translation adjustment, tax (expense)/benefit	(5.0)	(2.2)	2.6	(5.6)
Other comprehensive income/(loss)	(11.0)	17.6	(121.3)	(8.5)
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	(38.2)	(2.6)	(94.0)	2.8
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 11.0	$ 1.1	$ 27.8	$ 2.0