Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Net earnings including noncontrolling interests	$ 2,818.9	$ 2,759.3	$ 2,067.7
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	91.0	(224.7)	(41.7)
Comprehensive income including noncontrolling interests	2,909.9	2,534.6	2,026.0
Comprehensive income/(loss) attributable to noncontrolling interests	1.2	(29.2)	(0.4)
Comprehensive income attributable to Starbucks	2,908.7	2,563.8	2,026.4
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	3.5	1.4	1.6
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(1.3)	(0.5)	(0.6)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	(109.6)	47.6	24.1
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	27.5	(16.8)	(7.8)
Net Investment Hedges [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	0.0	4.3	25.5
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	0.0	(1.6)	(9.4)
Translation Adjustment [Member]
Other comprehensive income/(loss), net of tax:
Translation adjustment and other, before tax	85.5	(222.7)	(75.8)
Translation adjustment and other, tax (expense)/benefit	19.0	6.0	(1.6)
Other comprehensive income/(loss)	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	78.2	(65.9)	(1.5)
Reclassification adjustment for net gains (losses) realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ (11.8)	$ 23.5	$ 3.8