Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 26, 2016	Jun. 28, 2015	Jun. 26, 2016	Jun. 28, 2015
Net earnings including noncontrolling interests	$ 754.5	$ 626.5	$ 2,017.2	$ 2,106.8
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	60.6	(14.2)	70.8	(156.4)
Comprehensive income including noncontrolling interests	815.1	612.3	2,088.0	1,950.4
Comprehensive income/(loss) attributable to noncontrolling interests	0.4	(0.2)	0.4	(29.2)
Comprehensive income attributable to Starbucks	814.7	612.5	2,087.6	1,979.6
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	(4.1)	(1.8)	0.7	0.3
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	1.5	0.7	(0.3)	(0.1)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	(48.4)	33.9	(110.7)	97.8
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	12.8	(8.8)	27.5	(24.2)
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	0.0	0.0	0.0	4.3
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	0.0	0.0	0.0	(1.6)
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(3.2)	(1.6)	(0.2)	(0.8)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	9.1	(1.6)	(20.3)	(1.3)
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	0.0	0.0	0.0	(1.9)
Translation Adjustment [Member]
Other comprehensive income/(loss), net of tax:
Translation adjustment, before tax	49.8	(6.0)	79.8	(169.3)
Translation adjustment, tax (expense)/benefit	4.9	(5.0)	11.5	2.6
Other comprehensive income/(loss)	54.7	(11.0)	91.3	(121.3)
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, and translation adjustment, before tax	53.8	(38.2)	73.3	(94.0)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ (9.7)	$ 11.0	$ (11.0)	$ 27.8