Earnings Per Share (Calculation of Net Earnings Per Common Share ("EPS") - Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 29, 2024	Oct. 01, 2023	Oct. 02, 2022
Earnings Per Share [Abstract]
Net earnings attributable to Starbucks	$ 3,760.9	$ 4,124.5	$ 3,281.6
Weighted average common shares and common stock units outstanding (for basic calculation)	1,133.8	1,146.8	1,153.3
Dilutive effect of outstanding common stock options and RSUs	3.5	4.5	5.2
Weighted average common and common equivalent shares outstanding (for diluted calculation)	1,137.3	1,151.3	1,158.5
Earnings Per Share, Basic	$ 3.32	$ 3.60	$ 2.85
Earnings/(loss) Per Share, Diluted	$ 3.31	$ 3.58	$ 2.83