Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Net earnings including noncontrolling interests	$ 1,373.2	$ 852.0	$ 2,792.2	$ 3,761.9
Other comprehensive loss, net of tax:
Other comprehensive income/(loss)	(77.5)	(235.6)	(18.7)	(47.1)
Comprehensive income including noncontrolling interests	1,295.7	616.4	2,773.5	3,714.8
Comprehensive income/(loss) attributable to noncontrolling interests	0.4	(0.5)	(4.2)	(0.9)
Comprehensive income attributable to Starbucks	1,295.3	616.9	2,777.7	3,715.7
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	3.7	(0.5)	9.6	(6.5)
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(0.8)	0.1	(2.1)	1.8
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	(3.2)	46.0	(24.7)	0.6
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	0.6	(10.4)	5.9	(1.2)
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	(21.1)	32.4	(40.1)	(11.8)
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	5.3	(8.3)	10.2	2.8
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	(64.9)	(281.9)	15.0	(70.3)
Translation adjustment and other, tax (expense)/benefit	0.0	1.3	1.4	3.5
Other comprehensive income/(loss)	(66.6)	(280.6)	14.7	(49.9)
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	3.2	(17.5)	5.5	38.0
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ (0.3)	$ 3.2	$ 0.6	$ (4.0)