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Fair Value Measurements - Carrying Value and Estimated Fair Value of Notes (Details) - USD ($) $ in Thousands | Apr. 12, 2020 | Sep. 29, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | $ 1,407,957 | $ 1,303,594
Senior Notes | Class A-1 Variable Funding Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes | 107,876 | 0
Carrying Amount | Senior Notes | Class A-2 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | 1,296,751 | 1,300,000
Fair Value | Senior Notes | Class A-2 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total debt | $ 1,170,896 | $ 1,344,300

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