Earnings Per Share (Calculation Of Net Earnings Per Common Share ("EPS") - Basic And Diluted) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012
Earnings Per Share [Abstract]
Net earnings attributable to Starbucks	$ 390.4	$ 309.9	$ 822.5	$ 691.9
Weighted average common shares and common stock units outstanding (for basic calculation)	749.1	754.6	747.6	751.3
Dilutive effect of outstanding common stock options and RSUs	12.2	18.7	13.7	19.6
Weighted average common and common equivalent shares outstanding (for diluted calculation)	761.3	773.3	761.3	770.9
EPS - basic	$ 0.52	$ 0.41	$ 1.10	$ 0.92
EPS - diluted	$ 0.51	$ 0.40	$ 1.08	$ 0.90