Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Net earnings/(loss) including noncontrolling interests	$ (678.1)	$ 1,373.2	$ 532.0	$ 2,792.2
Other comprehensive loss, net of tax:
Other comprehensive income/(loss)	(8.1)	(77.5)	(31.4)	(18.7)
Comprehensive income/(loss) including noncontrolling interests	(686.2)	1,295.7	500.6	2,773.5
Comprehensive income/(loss) attributable to noncontrolling interests	0.3	0.4	(3.7)	(4.2)
Comprehensive income/(loss) attributable to Starbucks	(686.5)	1,295.3	504.3	2,777.7
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	5.1	3.7	8.2	9.6
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(1.1)	(0.8)	(1.8)	(2.1)
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	(28.6)	(3.2)	(124.1)	(24.7)
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	6.3	0.6	30.9	5.9
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	(24.6)	(21.1)	56.7	(40.1)
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	6.2	5.3	(14.4)	10.2
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	29.0	(64.9)	25.2	15.0
Translation adjustment and other, tax (expense)/benefit	0.0	0.0	1.5	1.4
Other comprehensive income/(loss)	29.0	(66.6)	26.7	14.7
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	(0.9)	3.2	(18.0)	5.5
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 0.5	$ (0.3)	$ 4.4	$ 0.6