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									12 Months Ended
	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 28, 2014	Sep. 29, 2013		Sep. 30, 2012
Earnings Per Share [Abstract]
Net earnings attributable to Starbucks	$ 587.9	$ 512.6	$ 427.0	$ 540.7	$ (1,232.0)	[1]	$ 417.8	$ 390.4	$ 432.2	$ 2,068.1	$ 8.3	[1]	$ 1,383.8
Weighted average common shares and common stock units outstanding (for basic calculation)										753.1	749.3		754.4
Dilutive effect of outstanding common stock options and RSUs										10.0	13.0		18.6
Weighted average common and common equivalent shares outstanding (for diluted calculation)										763.1	762.3		773.0
EPS - basic										$ 2.75	$ 0.01		$ 1.83
EPS - diluted	$ 0.77	$ 0.67	$ 0.56	$ 0.71	$ (1.64)	[1]	$ 0.55	$ 0.51	$ 0.57	$ 2.71	$ 0.01	[1]	$ 1.79

[1] The fourth quarter of fiscal 2013 includes a pretax charge of $2,784.1 million resulting from the conclusion of the arbitration with Kraft.