Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024
Net earnings including noncontrolling interests	$ 558.5	$ 1,055.7	$ 1,723.5	$ 2,852.7
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(6.2)	13.5	(106.4)	170.2
Comprehensive income including noncontrolling interests	552.3	1,069.2	1,617.1	3,022.9
Comprehensive income/(loss) attributable to noncontrolling interests	0.3	0.9	0.1	1.0
Comprehensive income attributable to Starbucks	552.0	1,068.3	1,617.0	3,021.9
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	1.9	1.1	2.0	6.3
Unrealized holding gains/(losses) on available-for-sale debt securities, tax (expense)/benefit	(0.5)	(0.3)	(0.5)	(1.6)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on cash flow hedging instruments, before tax	(83.8)	38.4	(20.8)	110.2
Unrealized gains/(losses) on cash flow hedging instruments, tax (expense)/benefit	15.8	(8.9)	(0.6)	(20.0)
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on net investment hedging instruments, before tax	(77.4)	114.0	143.2	181.3
Unrealized gains/(losses) on net investment hedging instruments, tax (expense)/benefit	19.4	(28.8)	(36.3)	(45.8)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
Other comprehensive income/(loss), net of tax:
Translation adjustment and other, before tax	157.7	(91.8)	(63.2)	(59.9)
Translation adjustment and other, tax (expense)/benefit	0.0	(0.2)	0.0	(3.8)
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	(50.3)	(14.2)	(171.7)	(2.9)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, translation adjustment, and other, tax expense/(benefit)	$ 11.0	$ 4.2	$ 41.5	$ 6.4