Shareholders' Equity (Comprehensive Income, Net Of Related Tax Effects) (Details) (USD $) In Millions	12 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Sep. 27, 2009
Net earnings attributable to Starbucks	$ 1,245.7	$ 945.6	$ 390.8
Net unrealized gain/(loss)	(4.4)	(17.0)	1.8
Total comprehensive income	1,234.8	937.4	407.8
Available-For-Sale Securities [Member]
Unrealized holding gains/(losses) on available-for-sale securities, net of tax (provision)/benefit	0.4	(0.2)	3.3
Unrealized holding gains/(losses) on available-for-sale securities, tax (provision)/benefit	(0.3)	0.1	(1.9)
Cash Flow Hedging [Member]
Unrealized holding gains/(losses) on derivatives, net of tax (provision)/benefit	(7.7)	(11.3)	4.0
Unrealized holding gains/(losses) on derivatives, tax (provision)/benefit	4.5	6.6	(2.4)
Reclassification adjustment for net losses realized in net earnings for cash flow hedges, net of tax benefit	10.5	1.3	1.3
Reclassification adjustment for net losses realized in net earnings for cash flow hedges, tax benefit	6.1	0.8	0.8
Net Investment Hedging [Member]
Unrealized holding gains/(losses) on derivatives, net of tax (provision)/benefit	(7.6)	(6.8)	(6.8)
Unrealized holding gains/(losses) on derivatives, tax (provision)/benefit	4.5	4.0	4.0
Translation Adjustment [Member]
Translation adjustment, net of tax benefit/(provision)	(6.5)	8.8	15.2
Translation adjustment, tax (provision)/benefit	$ 0.9	$ (3.2)	$ 6.0