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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 25, 2022 | Sep. 26, 2021 | Sep. 27, 2020 | Mar. 31, 2014
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair value adjustment of warrants | $ 71 | $ 292 | $ 832 |
Senior Secured Notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Term note | $ 462,554 |  |  |
TCT |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percent ownership of voting common stock of TCT | 0.70% |  |  |
Total percent of voting common stock | 8.70% |  |  |
Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value disclosure, total | $ 4,226 |  |  |
Level 3 | TCT and Private Equity Investment |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percent ownership of non-voting common stock | 16.70% |  |  |
Level 2 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value disclosure, total | $ 1,745 |  |  |
Warrants | 0 | $ 71 | $ 363 | $ 16,930
Level 2 | Senior Secured Notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Long-term debt, fair value | $ 463,446 |  |  |

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