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Benefit Plans - Additional Information (Details) shares in Millions, $ in Billions	3 Months Ended		9 Months Ended
	Jun. 26, 2021 USD ($) shares	Jun. 27, 2020 USD ($)	Jun. 26, 2021 USD ($) shares	Jun. 27, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance under stock plans (in shares) | shares	757		757
Total unrecognized compensation cost related to RSUs and stock options	$ 15.3		$ 15.3
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period			2 years 8 months 12 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted, vesting period			4 years
Number of shares of common stock issued per RSU upon vesting			1
Factor by which each RSU granted reduces, and each RSU canceled or share withheld for taxes increases, the number of shares available for grant			2
Fair value of RSUs as of the respective vesting dates	$ 7.9	$ 5.0	$ 17.3	$ 9.8

X

- Definition

Factor (generally 2-for-1) by which shares available for future grant change as a result of RSU transactions. Each RSU granted reduces shares available for future grant, and each RSU canceled or withheld to satisfy tax withholding obligations increases shares available for future grant.

+ References

No definition available.

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- Definition

Number of shares of common stock awarded upon settlement of RSUs.

+ References

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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-Section 50
-Paragraph 2
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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