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Indebtedness (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 14, 2024 | Sep. 29, 2024 | Oct. 01, 2023 | Oct. 02, 2022 | Aug. 31, 2027 | Mar. 08, 2022 | Feb. 11, 2022 | Oct. 03, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 0 | $ 0 | $ 7,700,000 |  |  |  |
Debt issuance costs |  | 16,225,000 | 20,604,000 |  |  |  |  |
Del Taco | Bridge Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 600,000,000 |  |
Term loan debt issuance cost |  |  |  |  |  | 2,100,000 |  |
Line of Credit | Del Taco |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unused borrowing capacity |  | $ 75,000,000.0 |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | 300,000 |  |
Line of Credit | Del Taco | Syndicated Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 75,000,000 |  |
Total debt |  |  |  |  |  | 115,200,000 |  |
Line of Credit | Del Taco | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 20,000,000 |  |
Series 2022 Class A-2 Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 550,000,000 |
Class A-2-II Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | 550,000,000 |
Series 2022-1 Class A-1 Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 150,000,000 |
Series 2022-1 Variable Funding Notes, variable interest rate of 6.788% at September 29, 2024 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 6.788% |  |  |  |  |  |
Revolving credit facility |  | $ 6,000,000 | 0 |  |  |  |  |
Unused borrowing capacity |  | 94,500,000 |  |  |  |  |  |
Line of credit issued |  | $ 49,500,000 |  |  |  |  |  |
Series 2022-1 Variable Funding Notes, variable interest rate of 6.788% at September 29, 2024 | Senior Notes | Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 5.00% |  |  |
Series 2022-1 Variable Funding Notes, variable interest rate of 6.788% at September 29, 2024 | Senior Notes | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |  |
Series 2022-1 Variable Funding Notes, variable interest rate of 6.788% at September 29, 2024 | Senior Notes | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |
Series 2022 Class A-2 Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 4.476% |  |  |  |  |  |
Total debt |  | $ 265,375,000 | 268,125,000 |  |  |  |  |
Effective interest rate |  | 4.851% |  |  |  |  |  |
Series 2019-1 Class A-2-III Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Effective interest rate |  | 5.258% |  |  |  |  |  |
Series 2022-1 3.445% Fixed Rate Class A-2-I Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 3.445% |  |  |  |  | 3.445% |
Total debt |  | $ 522,500,000 | 533,500,000 |  |  |  |  |
Effective interest rate |  | 3.796% |  |  |  |  |  |
Series 2022-1 4.136% Fixed Rate Class A-2-II Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 4.136% |  |  |  |  | 4.136% |
Total debt |  | $ 522,500,000 | $ 533,500,000 |  |  |  |  |
Effective interest rate |  | 4.347% |  |  |  |  |  |
Series 2019 Class A-2 Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  | $ 570,700,000
Loss on extinguishment of debt | $ 5,600,000 |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  | $ 17,400,000 |
Specified maximum leverage ratio |  | 5.0 |  |  |  |  |  |

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