Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2015	Dec. 28, 2014
Net earnings including noncontrolling interests	$ 687.7	$ 984.5
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(25.7)	(154.1)
Comprehensive income including noncontrolling interests	662.0	830.4
Comprehensive income/(loss) attributable to noncontrolling interests	0.1	(30.4)
Comprehensive income attributable to Starbucks	661.9	860.8
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	1.0	(0.6)
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(0.4)	0.2
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	5.8	51.7
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(2.7)	(12.9)
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	0.0	4.3
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	0.0	(1.6)
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	0.9	(0.5)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(2.2)	(13.4)
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	0.0	(1.9)
Translation Adjustment [Member]
Other comprehensive income/(loss), net of tax:
Translation adjustment, before tax	(26.1)	(156.4)
Translation adjustment, tax (expense)/benefit	1.7	3.8
Other comprehensive income/(loss)	(24.4)	(106.5)
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	(7.7)	(59.8)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 2.7	$ 17.2