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		12 Months Ended
	Mar. 30, 2014	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Mar. 30, 2014	Mar. 31, 2013	Sep. 29, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net earnings attributable to Starbucks	$ 427.0	$ (1,232.0)	$ 417.8	$ 390.4	$ 432.2	$ 967.6	$ 822.5	$ 8.3	$ 1,383.8
Weighted average common shares outstanding (for basic calculation)	755.2			749.1		755.0	747.6
Dilutive effect of outstanding common stock options and RSUs	9.4			12.2		10.4	13.7
Weighted average common and common equivalent shares outstanding (for diluted calculation)	764.6			761.3		765.4	761.3
EPS - basic	$ 0.57			$ 0.52		$ 1.28	$ 1.10
EPS - diluted	$ 0.56			$ 0.51		$ 1.26	$ 1.08