Equity (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013
Equity [Abstract]
Authorized shares of common stock	1,200.0	1,200.0
Par value of common stock	$ 0.001	$ 0.001
Authorized shares of preferred stock	7.5
Outstanding shares of preferred stock	0
Increase in share of net assets of Starbucks Japan at IPO	$ 39.4	$ 39.4
Shares of common stock repurchased	10.5	10.8
Total cost of common stock repurchased	$ 769.8	$ 544.1
Shares available for repurchase	15.9