Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Net earnings/(loss) including noncontrolling interests	$ 1,154.2	$ (678.1)	$ 2,435.7	$ 532.0
Other comprehensive loss, net of tax:
Other comprehensive income/(loss)	96.6	(8.1)	334.9	(31.4)
Comprehensive income/(loss) including noncontrolling interests	1,250.8	(686.2)	2,770.6	500.6
Comprehensive income/(loss) attributable to noncontrolling interests	0.8	0.3	0.8	(3.7)
Comprehensive income/(loss) attributable to Starbucks	1,250.0	(686.5)	2,769.8	504.3
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	(0.1)	5.1	(3.1)	8.2
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	0.0	(1.1)	0.6	(1.8)
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	34.0	(28.6)	138.9	(124.1)
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(1.1)	6.3	(27.9)	30.9
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	32.4	(24.6)	49.9	56.7
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(8.2)	6.2	(12.7)	(14.4)
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	40.2	29.0	195.5	25.2
Translation adjustment and other, tax (expense)/benefit	0.0	0.0	2.2	1.5
Other comprehensive income/(loss)	40.2	29.0	197.7	26.7
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	(1.6)	(0.9)	(13.1)	(18.0)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 1.0	$ 0.5	$ 4.6	$ 4.4