Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Numerator:
Net income	$ 34,630	$ 28,755
Denominator:
Weighted-average basic shares outstanding (in shares)	16,391,724	16,935,119
Effect of dilutive securities (in shares)	127,567	178,569
Weighted-average diluted shares (in shares)	16,519,291	17,113,688
Basic earnings per share (in dollars per share)	$ 2.11	$ 1.70
Diluted earnings per share (in dollars per share)	$ 2.10	$ 1.68