Acquisitions and Divestitures (Narrative) (Details)		3 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) store	Apr. 01, 2018 USD ($)	Oct. 01, 2017 USD ($)	Jun. 26, 2016 USD ($)	Sep. 29, 2018 USD ($)	Sep. 30, 2018 USD ($)	Oct. 01, 2017 USD ($)	Oct. 02, 2016 USD ($)
Business Acquisition [Line Items]
Deconsolidation, Gain (Loss), Amount						$ 499,200,000	$ 93,500,000	$ 6,100,000
Finite-lived intangible assets, amortization expense						186,500,000	57,500,000	57,300,000
Finite-lived intangible assets, accumulated amortization			$ 194,800,000			371,000,000	194,800,000
Goodwill			1,539,200,000			3,541,600,000	1,539,200,000	1,719,600,000
Gain resulting from acquisition of joint venture						1,376,400,000	0	$ 0
Finite-Lived Intangible Assets, Amortization Expense, Year Five						5,100,000
Thereafter						6,300,000
Acquired and reacquired rights [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, accumulated amortization			154,200,000			320,100,000	154,200,000
Brazil Retail Operations [Member]
Business Acquisition [Line Items]
Total proceeds from sale of retail store assets and operations		$ 48,200,000
Singapore Retail Operations [Member]
Business Acquisition [Line Items]
Total proceeds from sale of retail store assets and operations			119,900,000
Deconsolidation, Gain (Loss), Amount			$ 83,900,000
East China JV [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two						163,800,000
Business Combination, Consideration Transferred		1,400,000,000
Business Combination, Separately Recognized Transactions, Liabilities Recognized	$ 90,500,000	$ 90,500,000
Number of Stores | store	1,400
Preexisting ownership percentage		50.00%
Payments to Acquire Interest in Joint Venture	$ 1,440,800,000
Business Acquisition, Effective Date of Acquisition	Dec. 31, 2017
Finite-lived intangible assets, amortization expense						129,800,000
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months						163,800,000
Acquired finite-lived intangible assets, amortization expense, year three						163,800,000
Acquired finite-lived intangible assets, amortization expense, year five						160,400,000
Goodwill, effect of foreign currency translation					$ 115,200,000
Goodwill	$ 2,164,100,000					2,048,900,000
Gain resulting from acquisition of joint venture						1,400,000,000	1,376,400,000
Acquisition-related costs, including integration costs							39,300,000
Business Combination, Acquisition Related Costs						3,600,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	1,440,800,000					1,400,000,000
Revenue included in consolidated statements of earnings						903,000,000
Net earnings included in consolidated statements of earnings						73,100,000
Business Acquisition, Pro Forma Revenue						24,990,400	23,315,000
Business Acquisition, Pro Forma Net Income (Loss)						$ 3,196,800	$ 4,209,000
East China JV [Member] | Acquired and reacquired rights [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 798,000,000
Tazo business [Member]
Business Acquisition [Line Items]
Deconsolidation, Gain (Loss), Amount		$ 347,900,000
Proceeds from Divestiture of Businesses		$ 383,800,000
Taiwan JV [Member]
Business Acquisition [Line Items]
Preexisting ownership percentage		50.00%
President Starbucks Coffee Taiwan Ltd. [Member]
Business Acquisition [Line Items]
Total proceeds from sale of retail store assets and operations		$ 181,200,000
Deconsolidation, Gain (Loss), Amount		$ 156,600,000
Germany Retail Operations [Member]
Business Acquisition [Line Items]
Total proceeds from sale of retail store assets and operations				$ 47,300,000
Gain/(loss) resulting from divestiture				insignificant