Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2025	Mar. 31, 2024	Mar. 30, 2025	Mar. 31, 2024
Net earnings including noncontrolling interests	$ 384.1	$ 772.5	$ 1,165.1	$ 1,796.9
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	54.6	(63.7)	(100.2)	156.7
Comprehensive income including noncontrolling interests	438.7	708.8	1,064.9	1,953.6
Comprehensive income/(loss) attributable to noncontrolling interests	(0.1)	0.0	(0.2)	0.2
Comprehensive income attributable to Starbucks	438.8	708.8	1,065.1	1,953.4
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	2.2	(0.4)	0.1	5.2
Unrealized holding gains/(losses) on available-for-sale debt securities, tax (expense)/benefit	(0.5)	0.1	0.0	(1.3)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on cash flow hedging instruments, before tax	(6.6)	36.4	63.0	71.8
Unrealized gains/(losses) on cash flow hedging instruments, tax (expense)/benefit	1.7	(9.3)	(16.4)	(11.1)
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on net investment hedging instruments, before tax	13.1	92.5	220.6	67.3
Unrealized gains/(losses) on net investment hedging instruments, tax (expense)/benefit	(3.3)	(23.3)	(55.7)	(17.0)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
Other comprehensive income/(loss), net of tax:
Translation adjustment and other, before tax	90.6	(151.2)	(220.9)	31.9
Translation adjustment and other, tax (expense)/benefit	0.0	1.1	0.0	(3.6)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other comprehensive income/(loss), net of tax:
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, translation adjustment, and other, before tax	(54.5)	(13.6)	(121.4)	11.3
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, translation adjustment, and other, tax expense/(benefit)	$ 11.9	$ 4.0	$ 30.5	$ 2.2