Other Intangible Assets and Goodwill (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jul. 02, 2017	Sep. 29, 2019	Sep. 30, 2018	Oct. 01, 2017	Jul. 01, 2018
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 10,500,000	$ 37,600,000	$ 87,200,000
Goodwill		3,490,800,000	3,541,600,000	1,539,200,000
Other intangible assets		781,800,000	1,042,200,000
Amortization of Intangible Assets		$ 232,800,000	186,500,000	$ 57,500,000
Teavana [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 69,300,000
Goodwill	398,300,000				$ 398,300,000
Asset Impairment Charges	$ 33,000,000.0
Starbucks Coffee Switzerland [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss			$ 37,600,000