Summary of Significant Accounting Policies (Schedule of Error Corrections and Prior Period Adjustments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					6 Months Ended		12 Months Ended
	Mar. 30, 2014	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Mar. 30, 2014	Mar. 31, 2013	Sep. 29, 2013	Sep. 30, 2012
Net revenues:
Company-operated stores	$ 3,068.0	$ 3,009.6	$ 2,986.3	$ 2,807.7	$ 2,989.6	$ 6,411.8	$ 5,797.3	$ 11,793.2	$ 10,534.5
Licensed stores	356.2	346.3	342.0	322.1	350.2	758.0	672.2	1,360.5	1,210.3
CPG, foodservice and other	449.6	432.9	407.0	419.8	453.4	943.6	873.2	1,713.1	1,532.0
Total net revenues	3,873.8	3,788.8	3,735.3	3,549.6	3,793.2	8,113.4	7,342.7	14,866.8	13,276.8
Cost of sales including occupancy costs	1,629.2	1,633.7	1,597.6	1,530.4	1,620.7	3,424.2	3,151.1	6,382.3	5,813.3
Store operating expenses	1,134.5	1,073.9	1,084.1	1,038.4	1,089.5	2,309.6	2,127.9	4,286.1	3,918.1
Other operating expenses	110.9	101.1	98.9	105.8	126.1	225.8	231.9	431.8	407.2
Depreciation and amortization expenses	174.4	166.1	153.3	153.1	148.9	344.1	302.0	621.4	550.3
General and administrative expenses	240.6	226.1	249.6	230.3	231.9	483.2	462.2	937.9	801.2
Litigation charge	0	2,784.1	0	0	0	(20.2)	0	2,784.1	0
Total operating expenses	3,289.6	5,985.0	3,183.5	3,058.0	3,217.1	6,766.7	6,275.1	15,443.6	11,490.1
Income from equity investees	59.9	81.0	63.4	52.5	54.5	111.0	107.0	251.4	210.7
Operating income/(loss)	644.1	(2,115.2)	615.2	544.1	630.6	1,457.7	1,174.6	(325.4)	1,997.4
Interest income and other, net	17.8	72.1	3.5	50.8	(2.9)	37.6	48.0	123.6	94.4
Interest expense	(16.7)	(9.1)	(6.3)	(6.1)	(6.6)	(31.3)	(12.7)	(28.1)	(32.7)
Earnings/(loss) before income taxes	645.2	(2,052.2)	612.4	588.8	621.1	1,464.0	1,209.9	(229.9)	2,059.1
Income taxes	218.3	(820.1)	194.6	198.1	188.7	496.4	386.8	(238.7)	674.4
Net earnings including noncontrolling interests	426.9	(1,232.1)	417.8	390.7	432.4	967.6	823.1	8.8	1,384.7
Net earnings/(loss) attributable to noncontrolling interests	(0.1)	(0.1)	0	0.3	0.2	0	0.6	0.5	0.9
Net earnings attributable to Starbucks	$ 427.0	$ (1,232.0)	$ 417.8	$ 390.4	$ 432.2	$ 967.6	$ 822.5	$ 8.3	$ 1,383.8