Segment Reporting (Financial Information For Reportable Operating Segments And All Other Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 01, 2018	Apr. 02, 2017	Apr. 01, 2018	Apr. 02, 2017	Oct. 01, 2017
Segment Reporting Information [Line Items]
Impairment			$ 28.5	$ 0.0
Gain (Loss) on Disposition of Business	$ (4.9)	$ 9.6	496.3	9.6
Total net revenues	6,031.8	5,294.0	12,105.5	11,027.0
Depreciation and amortization expenses	331.6	253.6	590.4	503.3
Income from equity investees	52.7	84.1	142.1	168.6
Operating income/(loss)	772.5	935.4	1,888.6	2,068.3
Starbucks Coffee Switzerland [Member]
Segment Reporting Information [Line Items]
Impairment	28.5
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]
Total net revenues	6,031.8	5,294.0	12,105.5	11,027.0
Depreciation and amortization expenses	291.3	216.4	511.9	428.5
Income from equity investees	52.7	84.1	142.1	168.6
Operating income/(loss)	1,102.1	1,197.8	2,530.5	2,616.3
Operating Segments [Member] | Americas Segment [Member]
Segment Reporting Information [Line Items]
Total net revenues	4,003.5	3,720.4	8,269.3	7,711.8
Depreciation and amortization expenses	160.4	155.4	318.4	307.8
Income from equity investees	0.0	0.0	0.0	0.0
Operating income/(loss)	801.3	826.1	1,780.6	1,784.6
Operating Segments [Member] | China / Asia Pacific Segment [Member]
Segment Reporting Information [Line Items]
Total net revenues	1,186.4	768.9	2,030.0	1,539.6
Depreciation and amortization expenses	121.6	49.3	175.3	98.0
Income from equity investees	16.7	44.1	67.5	86.6
Operating income/(loss)	204.6	175.9	401.4	339.1
Operating Segments [Member] | EMEA Segment [Member]
Segment Reporting Information [Line Items]
Total net revenues	266.1	231.7	549.9	493.9
Depreciation and amortization expenses	8.1	7.6	15.8	15.2
Income from equity investees	0.0	0.0	0.0	0.0
Operating income/(loss)	(4.3)	27.7	34.7	71.6
Operating Segments [Member] | Channel Development [Member]
Segment Reporting Information [Line Items]
Total net revenues	500.2	461.3	1,060.4	1,014.9
Depreciation and amortization expenses	0.2	0.6	0.7	1.2
Income from equity investees	36.0	40.0	74.6	82.0
Operating income/(loss)	215.3	193.6	458.4	436.4
Operating Segments [Member] | All Other Segments [Member]
Segment Reporting Information [Line Items]
Total net revenues	75.6	111.7	195.9	266.8
Depreciation and amortization expenses	1.0	3.5	1.7	6.3
Income from equity investees	0.0	0.0	0.0	0.0
Operating income/(loss)	(114.8)	$ (25.5)	(144.6)	$ (15.4)
Contract Termination [Member] | Restructuring Charges [Member]
Segment Reporting Information [Line Items]
Business Exit Costs	$ 100.9		$ 117.5		$ 15.7