Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Jan. 01, 2023
Net earnings including noncontrolling interests	$ 1,024.4	$ 855.2
Other comprehensive loss, net of tax:
Other comprehensive income/(loss)	220.4	(75.7)
Comprehensive income including noncontrolling interests	1,244.8	779.5
Comprehensive income attributable to noncontrolling interests	0.2	0.0
Comprehensive income attributable to Starbucks	1,244.6	779.5
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	5.6	2.0
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(1.4)	(0.5)
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	35.4	(180.7)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(1.8)	29.5
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	(25.2)	(64.6)
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification, Tax	6.3	16.3
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	183.1	208.9
Translation adjustment and other, tax (expense)/benefit	(4.7)	0.0
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Other comprehensive income/(loss)	178.2	208.9
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	24.9	(98.4)
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)	$ 11.8