Equity (Impact of Reclassifications from Accumulated Other Comprehensive Income on Earnings (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 27, 2015	Sep. 28, 2014	Sep. 29, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest expense										$ (70.5)	$ (64.1)	$ (28.1)
Amounts Reclassified from AOCI, Interest income and other, net										43.0	142.7	123.6
Amounts Reclassified from AOCI, Revenue		$ 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
Amounts Reclassified from AOCI, Cost of sales including occupancy costs										(7,787.5)	(6,858.8)	(6,382.3)
Gain resulting from acquisition of joint venture										390.6	0.0	0.0
Amounts Reclassified from AOCI, Tax (expense)/benefit										(1,143.7)	(1,092.0)	$ 238.7
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified, from AOCI, Total before tax										64.9	0.1
Amounts Reclassified from AOCI, Tax (expense)/benefit										(23.1)	(3.3)
Amounts Reclassified from AOCI, Net of tax										41.8	(3.2)
Net Investment Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax										(4.6)	0.0
Net Investment Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain resulting from acquisition of joint venture	[1]									7.2	0.0
Translation Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax										14.3	0.0
Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest income and other, net	[2]									(7.1)	0.0
Gain resulting from acquisition of joint venture	[2]									(7.2)	0.0
Interest Rate Contract [Member] | Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest expense		$ 2.0								3.2	5.0
Cross-Currency Swap [Member] | Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest income and other, net										46.2	0.0
Foreign Currency Contract - Other [Member] | Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Revenue										14.0	5.1
Foreign Currency and Coffee Contracts [Member] | Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Cost of sales including occupancy costs										8.6	$ (10.0)
Starbucks Coffee Japan Ltd [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain resulting from acquisition of joint venture										390.6
Preexisting ownership percentage						39.50%					39.50%
Starbucks Coffee Japan Ltd [Member] | Net Investment Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain resulting from acquisition of joint venture										$ 7.2

[1] (1) Release of pretax cumulative net gains in AOCI related to our net investment derivative instruments used to hedge our preexisting 39.5% equity method investment in Starbucks Japan.

[2] (2) Release of cumulative translation adjustments to earnings upon sale or liquidation of foreign business.