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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		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Numerator:
Net income	$ 23,630	$ 11,249	$ 52,385	$ 33,485
Denominator:
Weighted-average basic shares outstanding (in shares)	16,753,476	17,440,402	16,844,298	17,550,281
Effect of dilutive securities (in shares)	175,681	178,363	177,125	168,310
Weighted-average diluted shares (in shares)	16,929,157	17,618,765	17,021,423	17,718,591
Basic earnings per share (in dollars per share)	$ 1.41	$ 0.64	$ 3.11	$ 1.91
Diluted earnings per share (in dollars per share)	$ 1.40	$ 0.64	$ 3.08	$ 1.89

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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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