Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 28, 2021	Mar. 29, 2020
Net earnings including noncontrolling interests	$ 659.4	$ 324.8	$ 1,281.6	$ 1,210.1
Other comprehensive loss, net of tax:
Other comprehensive income/(loss)	19.6	(134.4)	238.3	(23.3)
Comprehensive income including noncontrolling interests	679.0	190.4	1,519.9	1,186.8
Comprehensive income/(loss) attributable to noncontrolling interests	0.0	(3.6)	0.0	(4.0)
Comprehensive income attributable to Starbucks	679.0	194.0	1,519.9	1,190.8
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	(2.5)	3.2	(3.0)	3.1
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	0.5	(0.7)	0.6	(0.7)
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	97.2	(127.9)	104.9	(95.5)
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(23.9)	31.2	(26.8)	24.6
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	47.7	57.6	17.5	81.3
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(12.1)	(14.6)	(4.5)	(20.6)
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	(83.4)	(79.9)	155.3	(3.8)
Translation adjustment and other, tax (expense)/benefit	2.2	1.5	2.2	1.5
Other comprehensive income/(loss)	(81.2)	(78.4)	157.5	(2.3)
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	(7.9)	(6.4)	(11.5)	(17.1)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 1.8	$ 1.6	$ 3.6	$ 3.9