Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 02, 2017	Jun. 26, 2016	Jul. 02, 2017	Jun. 26, 2016
Net earnings including noncontrolling interests	$ 691.3	$ 754.5	$ 2,095.5	$ 2,017.2
Other comprehensive loss, net of tax:
Other comprehensive income/(loss)	21.3	60.6	(76.7)	70.8
Comprehensive income including noncontrolling interests	712.6	815.1	2,018.8	2,088.0
Comprehensive income/(loss) attributable to noncontrolling interests	(0.3)	0.4	(0.6)	0.4
Comprehensive income attributable to Starbucks	712.9	814.7	2,019.4	2,087.6
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	1.6	(4.1)	(9.9)	0.7
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(0.6)	1.5	3.0	(0.3)
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	(15.2)	(48.4)	64.8	(110.7)
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	2.5	12.8	(16.3)	27.5
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	2.7	0.0	18.6	0.0
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(1.0)	0.0	(6.9)	0.0
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	38.0	49.8	(75.2)	79.8
Translation adjustment and other, tax (expense)/benefit	(1.8)	4.9	(0.9)	11.5
Other comprehensive income/(loss)	36.2	54.7	(76.1)	91.3
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive 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	(6.4)	53.8	(67.9)	73.3
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 1.5	$ (9.7)	$ 14.0	$ (11.0)