Selected Quarterly Financial Information (Schedule of Selected Quarterly Financial Information) (Details) $ / shares in Units, $ in Millions		3 Months Ended																12 Months Ended
	Apr. 09, 2015 $ / shares	Sep. 27, 2015 USD ($) $ / shares		Jun. 28, 2015 USD ($) $ / shares		Mar. 29, 2015 USD ($) $ / shares		Dec. 28, 2014 USD ($) $ / shares		Sep. 28, 2014 USD ($) $ / shares		Jun. 29, 2014 USD ($) $ / shares		Mar. 30, 2014 USD ($) $ / shares		Dec. 29, 2013 USD ($) $ / shares		Sep. 27, 2015 USD ($) $ / shares		Sep. 28, 2014 USD ($) $ / shares		Sep. 29, 2013 USD ($) $ / shares
Selected Quarterly Financial Information [Abstract]
Total net revenues | $		$ 4,914.8		$ 4,881.2		$ 4,563.5		$ 4,803.2		$ 4,180.8		$ 4,153.7		$ 3,873.8		$ 4,239.6		$ 19,162.7		$ 16,447.8		$ 14,866.8
Operating income/(loss) | $		969.4		938.6		777.5		915.5		854.9		768.5		644.1		813.5		3,601.0		3,081.1		(325.4)
Net earnings attributable to Starbucks | $		$ 652.5		$ 626.7		$ 494.9		$ 983.1		$ 587.9		$ 512.6		$ 427.0		$ 540.7		$ 2,757.4		$ 2,068.1		$ 8.3
EPS - diluted		$ 0.43	[1]	$ 0.41	[1]	$ 0.33	[1]	$ 0.65	[1]	$ 0.39	[1]	$ 0.34	[1]	$ 0.28	[1]	$ 0.35	[1]	$ 1.82	[1]	$ 1.35	[1]	$ 0.01
Class of Stock [Line Items]
Stock split conversion ratio	2
Common stock, par value		$ 0.001								$ 0.001								$ 0.001		$ 0.001
Common Stock [Member]
Class of Stock [Line Items]
Stock split conversion ratio	2
Common stock, par value	$ 0.001

[1] As discussed in Note 1, Summary of Significant Accounting Policies, on April 9, 2015, we effected a two-for-one stock split of our $0.001 par value common stock for shareholders of record as of March 30, 2015. All per-share data presented in this note has been retroactively adjusted to reflect this stock split.