Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jul. 02, 2017	Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016	Jul. 01, 2018
Debt Securities, Available-for-sale [Abstract]
Proceeds from sale of available-for-sale securities		$ 459,000,000	$ 999,700,000	$ 680,700,000
Trading Securities [Abstract]
Management Deferred Compensation Plan liability		102,200,000	105,900,000
Goodwill, Impairment Loss		37,600,000	87,200,000	0
Goodwill		3,541,600,000	1,539,200,000	$ 1,719,600,000
Other intangible assets		$ 1,042,200,000	$ 441,400,000
Maximum [Member]
Debt Securities, Available-for-sale [Abstract]
Long-term investments, contractual maturity period		4 years
Teavana [Member]
Trading Securities [Abstract]
Goodwill, Impairment Loss	$ 69,300,000
Goodwill	398,300,000				$ 398,300,000
Other intangible assets					$ 117,200,000
Starbucks Coffee Switzerland [Member]
Trading Securities [Abstract]
Goodwill, Impairment Loss	$ 17,900,000	$ 37,600,000