Summary of Significant Accounting Policies (Schedule of Error Corrections and Prior Period Adjustments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					9 Months Ended		12 Months Ended
	Jun. 29, 2014	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Jun. 29, 2014	Jun. 30, 2013	Sep. 29, 2013	Sep. 30, 2012
Net revenues:
Total net revenues	$ 4,153.7	$ 3,788.8	$ 3,735.3	$ 3,549.6	$ 3,793.2	$ 12,267.1	$ 11,078.1	$ 14,866.8	$ 13,276.8
Cost of sales including occupancy costs	1,711.5	1,633.7	1,597.6	1,530.4	1,620.7	5,135.7	4,748.6	6,382.3	5,813.3
Store operating expenses	1,176.5	1,073.9	1,084.1	1,038.4	1,089.5	3,486.1	3,212.2	4,286.1	3,918.1
Other operating expenses	120.6	101.1	98.9	105.8	126.1	346.3	330.8	431.8	407.2
Depreciation and amortization expenses	180.1	166.1	153.3	153.1	148.9	524.2	455.3	621.4	550.3
General and administrative expenses	269.4	226.1	249.6	230.3	231.9	752.6	711.7	937.9	801.2
Litigation charge	0	2,784.1	0	0	0	(20.2)	0	2,784.1	0
Total operating expenses	3,458.1	5,985.0	3,183.5	3,058.0	3,217.1	10,224.7	9,458.6	15,443.6	11,490.1
Income from equity investees	72.9	81.0	63.4	52.5	54.5	183.9	170.4	251.4	210.7
Operating income/(loss)	768.5	(2,115.2)	615.2	544.1	630.6	2,226.3	1,789.9	(325.4)	1,997.4
Interest income and other, net	19.4	72.1	3.5	50.8	(2.9)	57.0	51.4	123.6	94.4
Interest expense	(16.4)	(9.1)	(6.3)	(6.1)	(6.6)	(47.7)	(19.0)	(28.1)	(32.7)
Earnings/(loss) before income taxes	771.5	(2,052.2)	612.4	588.8	621.1	2,235.6	1,822.3	(229.9)	2,059.1
Income taxes	259.0	(820.1)	194.6	198.1	188.7	755.4	581.4	(238.7)	674.4
Net earnings including noncontrolling interests	512.5	(1,232.1)	417.8	390.7	432.4	1,480.2	1,240.9	8.8	1,384.7
Net earnings/(loss) attributable to noncontrolling interests	(0.1)	(0.1)	0	0.3	0.2	(0.1)	0.6	0.5	0.9
Net earnings attributable to Starbucks	512.6	(1,232.0)	417.8	390.4	432.2	1,480.3	1,240.3	8.3	1,383.8
Company-operated stores [Member]
Net revenues:
Total net revenues	3,290.5	3,009.6	2,986.3	2,807.7	2,989.6	9,702.3	8,783.7	11,793.2	10,534.5
Licensed stores [Member]
Net revenues:
Total net revenues	408.1	346.3	342.0	322.1	350.2	1,166.1	1,014.2	1,360.5	1,210.3
CPG, foodservice and other [Member]
Net revenues:
Total net revenues	$ 455.1	$ 432.9	$ 407.0	$ 419.8	$ 453.4	$ 1,398.7	$ 1,280.2	$ 1,713.1	$ 1,532.0