Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 27, 2016	Mar. 29, 2015	Mar. 27, 2016	Mar. 29, 2015
Net earnings including noncontrolling interests	$ 575.0	$ 495.6	$ 1,262.6	$ 1,480.4
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	35.9	11.9	10.2	(142.2)
Comprehensive income including noncontrolling interests	610.9	507.5	1,272.8	1,338.2
Comprehensive income/(loss) attributable to noncontrolling interests	(0.1)	1.4	0.0	(29.0)
Comprehensive income attributable to Starbucks	611.0	506.1	1,272.8	1,367.2
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	3.8	2.7	4.8	2.1
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(1.4)	(1.0)	(1.8)	(0.8)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on hedging instruments, before tax	(68.1)	12.2	(62.3)	63.9
Unrealized gains/(losses) on hedging instruments, tax (expense)/benefit	17.4	(2.5)	14.7	(15.4)
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)	2.1	1.3	3.0	0.8
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Other comprehensive income/(loss)	(27.2)	13.7	(29.4)	0.3
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	56.1	(6.9)	30.0	(163.3)
Translation adjustment, tax (expense)/benefit	4.9	3.8	6.6	7.6
Other comprehensive income/(loss)	61.0	(3.1)	36.6	(110.3)
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	27.3	4.0	19.5	(55.8)
Reclassification adjustment for net (gains)/losses realized in net earnings for available-for-sale securities, hedging instruments, and translation adjustment, tax expense/(benefit)	$ (4.1)	$ (0.4)	$ (1.3)	$ 16.8