Shareholders' Equity (Comprehensive Income, Net of Related Tax Effects) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Oct. 03, 2010
Net earnings attributable to Starbucks	$ 1,383.8	$ 1,245.7	$ 945.6
Net unrealized loss	(26.4)	(4.4)	(17.0)
Total comprehensive income	1,360.2	1,234.8	937.4
Available-for-sale Securities [Member]
Unrealized holding gains/(losses) on available-for-sale securities, net of tax (provision)/benefit	0.4	0.4	(0.2)
Unrealized holding gains/(losses) on available-for-sale securities, tax (provision)/benefit	(0.3)	(0.3)	0.1
Cash Flow Hedging [Member]
Unrealized holding gains/(losses) on derivatives, net of tax (provision)/benefit	(37.9)	(7.7)	(11.3)
Unrealized holding gains/(losses) on derivatives, tax (provision)/benefit	4.3	4.5	6.6
Reclassification adjustment for net losses realized in net earnings for cash flow hedges, net of tax benefit	10.5	10.5	1.3
Reclassification adjustment for net losses realized in net earnings for cash flow hedges, tax benefit	4.3	6.1	0.8
Net Investment Hedging [Member]
Unrealized holding gains/(losses) on derivatives, net of tax (provision)/benefit	0.6	(7.6)	(6.8)
Unrealized holding gains/(losses) on derivatives, tax (provision)/benefit	(0.4)	4.5	4.0
Translation Adjustment Member
Translation adjustment, net of tax (provision)/benefit	2.8	(6.5)	8.8
Translation adjustment, tax (provision)/benefit	$ (3.3)	$ 0.9	$ (3.2)