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Segment Reporting (Financial Information For Reportable Operating Segments And All Other Segments) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 01, 2018	Apr. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Oct. 01, 2017
Segment Reporting Information [Line Items]
Revenues	$ 6,310.3		$ 5,661.5	$ 18,415.9	$ 16,688.5
Impairment				28.5	87.2
Gain (Loss) on Disposition of Business	0.0		0.0	496.3	9.6
Depreciation and amortization expenses	330.0		252.6	920.4	756.0
Income from equity investees	71.4		101.0	213.5	269.5
Operating income/(loss)	1,038.2		1,044.2	2,926.9	3,112.1
Income Tax Expense (Benefit)	174.8		361.1	1,086.5	1,070.1
Starbucks Coffee Switzerland [Member]
Segment Reporting Information [Line Items]
Impairment		$ 28.5	17.9
Americas Segment [Member]
Segment Reporting Information [Line Items]
Impairment				0.0
China / Asia Pacific Segment [Member]
Segment Reporting Information [Line Items]
Impairment				0.0
EMEA Segment [Member]
Segment Reporting Information [Line Items]
Impairment				(28.5)
Channel Development [Member]
Segment Reporting Information [Line Items]
Impairment				0.0
All Other Segments [Member]
Segment Reporting Information [Line Items]
Impairment				0.0
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	6,310.3		5,661.5	18,415.9	16,688.5
Depreciation and amortization expenses	289.7		215.0	801.6	643.4
Income from equity investees	71.4		101.0	213.5	269.5
Operating income/(loss)	1,380.7		1,306.3		3,922.7
Income Tax Expense (Benefit)				3,911.4
Operating Segments [Member] \| Americas Segment [Member]
Segment Reporting Information [Line Items]
Revenues	4,230.6		3,991.9	12,500.2	11,703.7
Depreciation and amortization expenses	159.3		152.8	477.7	460.6
Income from equity investees	0.0		0.0	0.0	0.0
Operating income/(loss)	908.7		974.8	2,689.6	2,759.4
Operating Segments [Member] \| China / Asia Pacific Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,229.0		840.6	3,259.1	2,380.3
Depreciation and amortization expenses	120.7		51.0	296.0	148.9
Income from equity investees	23.5		51.8	91.0	138.4
Operating income/(loss)	234.1		223.8	635.5	563.2
Operating Segments [Member] \| EMEA Segment [Member]
Segment Reporting Information [Line Items]
Revenues	275.4		249.9	825.3	743.9
Depreciation and amortization expenses	8.0		7.7	23.8	22.9
Income from equity investees	0.0		0.0	0.0	0.0
Operating income/(loss)	34.9		9.8	69.5	81.5
Operating Segments [Member] \| Channel Development [Member]
Segment Reporting Information [Line Items]
Revenues	509.0		478.7	1,569.4	1,493.6
Depreciation and amortization expenses	0.2		0.5	0.9	1.7
Income from equity investees	47.9		49.2	122.5	131.1
Operating income/(loss)	212.8		210.2	671.2	646.5
Operating Segments [Member] \| All Other Segments [Member]
Segment Reporting Information [Line Items]
Revenues	66.3		100.4	261.9	367.0
Depreciation and amortization expenses	1.5		3.0	3.2	9.3
Income from equity investees	0.0		0.0	0.0	0.0
Operating income/(loss)	(9.8)		$ (112.3)	(154.4)	$ (127.9)
Contract Termination [Member] \| Restructuring Charges [Member]
Segment Reporting Information [Line Items]
Business Exit Costs	$ 1.5			$ 119.0		$ 15.7