Summary of Significant Accounting Policies (Schedule of Error Corrections and Prior Period Adjustments) (Details) (USD $) In Millions, 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
Total net revenues	$ 4,180.8	$ 4,153.7	$ 3,873.8	$ 4,239.6	$ 3,788.8	[1]	$ 3,735.3	[1]	$ 3,549.6	[1]	$ 3,793.2	[1]	$ 16,447.8	$ 14,866.8	[1]	$ 13,276.8
Cost of sales including occupancy costs					1,633.7		1,597.6		1,530.4		1,620.7		6,858.8	6,382.3		5,813.3
Store operating expenses					1,073.9		1,084.1		1,038.4		1,089.5		4,638.2	4,286.1		3,918.1
Other operating expenses					101.1		98.9		105.8		126.1		457.3	431.8		407.2
Depreciation and amortization expenses					166.1		153.3		153.1		148.9		709.6	621.4		550.3
General and administrative expenses					226.1		249.6		230.3		231.9		991.3	937.9		801.2
Litigation charge					2,784.1		0		0		0		(20.2)	2,784.1		0
Total operating expenses					5,985.0		3,183.5		3,058.0		3,217.1		13,635.0	15,443.6		11,490.1
Income from equity investees					81.0		63.4		52.5		54.5		268.3	251.4		210.7
Operating income/(loss)	854.9	768.5	644.1	813.5	(2,115.2)	[2]	615.2		544.1		630.6		3,081.1	(325.4)	[2]	1,997.4
Interest income and other, net					72.1		3.5		50.8		(2.9)		142.7	123.6		94.4
Interest expense					(9.1)		(6.3)		(6.1)		(6.6)		(64.1)	(28.1)		(32.7)
Earnings/(loss) before income taxes					(2,052.2)		612.4		588.8		621.1		3,159.7	(229.9)		2,059.1
Income tax expense/(benefit)					(820.1)		194.6		198.1		188.7		1,092.0	(238.7)		674.4
Net earnings/(loss) including noncontrolling interests					(1,232.1)		417.8		390.7		432.4		2,067.7	8.8		1,384.7
Net earnings/(loss) attributable to noncontrolling interests					(0.1)		0		0.3		0.2		(0.4)	0.5		0.9
Net earnings/(loss) attributable to Starbucks	587.9	512.6	427.0	540.7	(1,232.0)	[2]	417.8		390.4		432.2		2,068.1	8.3	[2]	1,383.8
Company-operated stores [Member]
Total net revenues					3,009.6		2,986.3		2,807.7		2,989.6		12,977.9	11,793.2		10,534.5
Licensed stores [Member]
Total net revenues					346.3		342.0		322.1		350.2		1,588.6	1,360.5		1,210.3
CPG, foodservice and other [Member]
Total net revenues					$ 432.9		$ 407.0		$ 419.8		$ 453.4		$ 1,881.3	$ 1,713.1		$ 1,532.0

[1] Includes the reclassifications resulting from the correction of the immaterial error discussed in Note 1, Summary of Significant Accounting Policies. We reclassified $6.4 million, $6.3 million, $6.4 million and $6.2 million for the first, second, third, and fourth quarters of fiscal year 2013, respectively, and $25.4 million for the full year of fiscal 2013.

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