Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Jan. 02, 2022	Dec. 27, 2020
Net earnings including noncontrolling interests	$ 816.1	$ 622.2
Other comprehensive loss, net of tax:
Other comprehensive income	106.3	218.7
Comprehensive income including noncontrolling interests	922.4	840.9
Comprehensive income attributable to noncontrolling interests	0.2	0.0
Comprehensive income attributable to Starbucks	922.2	840.9
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	(3.4)	(0.5)
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	0.8	0.1
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	88.7	7.7
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(11.8)	(2.9)
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	41.5	(30.2)
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(10.5)	7.6
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	14.2	238.7
Translation adjustment and other, tax (expense)/benefit	0.0	0.0
Other comprehensive income	14.2	238.7
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	(16.1)	(3.6)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 2.9	$ 1.8