Earnings Per Share (Calculation of Net Earnings Per Common Share (EPS) - Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Jan. 01, 2023	Jan. 02, 2022
Earnings Per Share [Abstract]
Net earnings attributable to Starbucks	$ 855.2	$ 815.9
Weighted average common shares outstanding (for basic calculation)	1,148.5	1,169.6
Dilutive effect of outstanding common stock options and RSUs	4.4	7.0
Weighted average common and common equivalent shares outstanding (for diluted calculation)	1,152.9	1,176.6
EPS — basic	$ 0.74	$ 0.70
EPS — diluted	$ 0.74	$ 0.69

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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