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Fair Value Measurements - Carrying Value and Estimated Fair Value of Notes (Details) - Senior Notes - USD ($) $ in Thousands | Jan. 17, 2021 | Sep. 27, 2020
--- | --- | ---
Series 2019-1 Variable Funding Senior Secured Notes, Class A-1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes | $ 107,900 |
Carrying Amount | Class A-2 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | 1,290,251 | $ 1,290,251
Fair Value | Class A-2 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | $ 1,354,188 | $ 1,354,241

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