Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Net earnings including noncontrolling interests	$ 2,884.9	$ 2,818.9	$ 2,759.3
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(47.2)	91.0	(224.7)
Comprehensive income including noncontrolling interests	2,837.7	2,909.9	2,534.6
Comprehensive income/(loss) attributable to noncontrolling interests	0.2	1.2	(29.2)
Comprehensive income attributable to Starbucks	2,837.5	2,908.7	2,563.8
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	(9.5)	3.5	1.4
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	2.9	(1.3)	(0.5)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	53.2	(109.6)	47.6
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(12.6)	27.5	(16.8)
Net Investment Hedges [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	20.1	0.0	4.3
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	(7.4)	0.0	(1.6)
Translation Adjustment [Member]
Other comprehensive income/(loss), net of tax:
Translation adjustment and other, before tax	(38.3)	85.5	(222.7)
Translation adjustment and other, tax (expense)/benefit	(2.4)	19.0	6.0
Other comprehensive income/(loss)	(41.3)	104.5	(171.3)
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	(67.2)	78.2	(65.9)
Reclassification adjustment for net gains (losses) realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ 14.0	$ (11.8)	$ 23.5