Equity and Cost Investments (Equity Method Investments) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended								3 Months Ended			3 Months Ended		0 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012	Sep. 28, 2014 Starbucks Coffee Korea Co., Ltd. [Member]	Sep. 28, 2014 President Starbucks Coffee Taiwan Ltd. [Member]	Sep. 28, 2014 Shanghai President Coffee Co. [Member]	Sep. 28, 2014 Tata Starbucks Limited (India) [Member]	Sep. 28, 2014 North America Coffee Partnership [Member]	Sep. 29, 2013 Starbucks Spain [Member]	Sep. 28, 2014 Starbucks Spain [Member]	Sep. 28, 2014 Starbucks Coffee Japan Ltd [Member]	Sep. 28, 2014 Berjaya Starbucks Coffee Company Sdn. Bhd. (Malaysia) [Member]	Sep. 28, 2014 Starbucks Coffee Japan Ltd [Member]	Oct. 31, 2014 Subsequent Event [Member] Starbucks Coffee Japan Ltd [Member]	Oct. 31, 2014 Subsequent Event [Member] Starbucks Coffee Japan Ltd [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity investees				50.00%	50.00%	50.00%	50.00%	50.00%	49.00%	49.00%		50.00%	39.50%
Market value of investment in Starbucks Japan											$ 762
Equity method investments	469.3	450.9									181.0
Acquisition date														Oct. 31, 2014
Ownership interest in Starbucks Japan acquired through first tender offer step															39.50%
Proceeds from sale of equity method investments												88.0
Gain on sale of investments												67.8
Payments to acquire equity method investments									33
Revenues generated from related parties	219.2	205.1	190.3
Related costs of sales	121.2	115.4	111.0
Accounts receivables from equity method investees	$ 54.9	$ 48.3