Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Net earnings including noncontrolling interests	$ 2,067.7	$ 8.8	$ 1,384.7
Other comprehensive income/(loss), net of tax:
Reclassification adjustment for net (gains)/losses realized in net earnings for cash flow hedges and available-for-sale securities, before tax	(1.5)	46.3	14.8
Reclassification adjustment for net (gains)/losses realized in net earnings for cash flow hedges and available-for-sale securities, tax expense/(benefit)	3.8	(3.5)	(4.3)
Translation adjustment, before tax	(75.8)	(41.6)	6.1
Translation adjustment, tax (expense)/benefit	(1.6)	0.3	(3.3)
Other comprehensive income/(loss)	(41.7)	44.3	(23.6)
Comprehensive income including noncontrolling interests	2,026.0	53.1	1,361.1
Comprehensive income/(loss) attributable to noncontrolling interests	(0.4)	0.5	0.9
Comprehensive income attributable to Starbucks	2,026.4	52.6	1,360.2
Available-for-sale Securities [Member]
Other comprehensive income/(loss), net of tax:
Unrealized holding gains/(losses) on available-for-sale securities, before tax	1.6	(0.6)	0.7
Unrealized holding gains/(losses) on available-for-sale securities, tax (expense)/benefit	(0.6)	0.2	(0.3)
Cash Flow Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on derivatives, before tax	24.1	47.1	(42.2)
Unrealized gains/(losses) on derivatives, tax (expense)/benefit	(7.8)	(24.6)	4.3
Net Investment Hedging [Member]
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on derivatives, before tax	25.5	32.8	1.0
Unrealized gains/(losses) on derivatives, tax (expense)/benefit	$ (9.4)	$ (12.1)	$ (0.4)