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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Apr. 11, 2021 | Sep. 27, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities at fair value |  | $ 18,066 | $ 25,071
Quoted Prices In Active Markets For Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities at fair value | [1] | 18,066 | 25,071
Significant Other Observable Inputs (2) (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities at fair value | [1] | 0 | 0
Significant Unobservable Inputs (2) (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities at fair value |  | 0 | 0
Non Qualified Deferred Compensation Plan |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities at fair value | [2] | 18,066 | 25,071
Non Qualified Deferred Compensation Plan | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities at fair value | [1],[2] | 18,066 | 25,071
Non Qualified Deferred Compensation Plan | Significant Other Observable Inputs (2) (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities at fair value |  | 0 | 0
Non Qualified Deferred Compensation Plan | Significant Unobservable Inputs (2) (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total liabilities at fair value |  | $ 0 | $ 0
[1] | We did not have any transfers in or out of Level 1, 2 or 3.
[2] | We maintain an unfunded defined contribution plan for key executives and other members of management. The fair value of this obligation is based on the closing market prices of the participants’ elected investments. The obligation is included in “Accrued liabilities” and “Other long-term liabilities” on our condensed consolidated balance sheets.

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