Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Jan. 01, 2017	Dec. 27, 2015
Net earnings including noncontrolling interests	$ 751.5	$ 687.7
Other comprehensive loss, net of tax:
Other comprehensive loss	(133.9)	(25.7)
Comprehensive income including noncontrolling interests	617.6	662.0
Comprehensive income/(loss) attributable to noncontrolling interests	(0.3)	0.1
Comprehensive income attributable to Starbucks	617.9	661.9
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	(13.4)	1.0
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	4.1	(0.4)
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	113.5	5.8
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(26.5)	(2.7)
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	41.1	0.0
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(15.2)	0.0
Available-for-sale Securities [Member]
Other comprehensive loss, net of tax:
Other comprehensive loss	(8.7)	0.9
Cash Flow Hedging [Member]
Other comprehensive loss, net of tax:
Other comprehensive loss	20.7	(2.2)
Net Investment Hedging [Member]
Other comprehensive loss, net of tax:
Other comprehensive loss	25.9	0.0
Translation Adjustment [Member]
Other comprehensive loss, net of tax:
Translation adjustment and other, before tax	(171.8)	(26.1)
Translation adjustment and other, tax (expense)/benefit	0.0	1.7
Other comprehensive loss	(171.8)	(24.4)
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	(81.7)	(7.7)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 16.0	$ 2.7