Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Net earnings including noncontrolling interests	$ 852.0	$ 691.3	$ 3,761.9	$ 2,095.5
Other comprehensive loss, net of tax:
Other comprehensive income/(loss)	(235.6)	21.3	(47.1)	(76.7)
Comprehensive income including noncontrolling interests	616.4	712.6	3,714.8	2,018.8
Comprehensive income/(loss) attributable to noncontrolling interests	(0.5)	(0.3)	(0.9)	(0.6)
Comprehensive income attributable to Starbucks	616.9	712.9	3,715.7	2,019.4
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	(0.5)	1.6	(6.5)	(9.9)
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	0.1	(0.6)	1.8	3.0
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	46.0	(15.2)	0.6	64.8
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(10.4)	2.5	(1.2)	(16.3)
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	32.4	2.7	(11.8)	18.6
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(8.3)	(1.0)	2.8	(6.9)
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	(281.9)	38.0	(70.3)	(75.2)
Translation adjustment and other, tax (expense)/benefit	1.3	(1.8)	3.5	(0.9)
Other comprehensive income/(loss)	(280.6)	36.2	(49.9)	(76.1)
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	(17.5)	(6.4)	38.0	(67.9)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 3.2	$ 1.5	$ (4.0)	$ 14.0