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Share-Based Employee Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 29, 2024 | Oct. 01, 2023 | Oct. 02, 2022
Del Taco RSUs subject to accelerated vesting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Awards outstanding (in shares) | 381,738 | 328,536 |
Total unrecognized compensation cost related to stock options granted | $ 11.8 |  |
Weighted-average period for unrecognized compensation cost, (in years) | 1 year 8 months 12 days |  |
Weighted-average grant-date fair value (in usd per share) | $ 67.74 | $ 68.56 | $ 78.28
Total fair value of awards vested | $ 8.0 | $ 4.6 | $ 2.5
Modified restricted stock units vested in period (in shares) | 113,773 |  |
Del Taco options subject to accelerated vesting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Total unrecognized compensation cost related to stock options granted | $ 0.0 |  |
Option grants contractual term | 7 years |  |
Total intrinsic value of stock options exercised | $ 0.0 |  | $ 0.1
Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Awards outstanding (in shares) | 145,167 | 107,174 |
Total unrecognized compensation cost related to stock options granted | $ 3.0 |  |
Weighted-average period for unrecognized compensation cost, (in years) | 1 year 10 months 24 days |  |
Weighted-average grant-date fair value (in usd per share) | $ 70.19 | $ 65.74 | $ 78.95
Total fair value of awards vested | $ 2.7 | $ 1.8 | $ 0.1
Modified restricted stock units vested in period (in shares) | 29,922 |  |
Del Taco RSAs subject to accelerated vesting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation cost related to stock options granted | $ 0.0 |  |
Total fair value of awards vested |  | $ 0.4 |
Deferred Compensation for Non Management Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards outstanding (in shares) | 91,885 | 122,981 |
Number of trading days | 10 days |  |
Shares issued in connection with director retirement (in shares) | 36,342 | 36,342 | 36,342
Share-Based Payment Arrangement |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 0 |  |
Minimum | Del Taco RSUs subject to accelerated vesting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock units vested, percentage | 50.00% |  |
Minimum | Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share awards vesting rights, percentage | 0.00% |  |
Maximum | Performance share awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share awards vesting rights, percentage | 150.00% |  |
Executive Officers | Del Taco RSUs subject to accelerated vesting | Share-Based Payment Arrangement, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Awards outstanding (in shares) | 22,582 |  |
Executive Officers | Del Taco RSUs subject to accelerated vesting | Share-Based Payment Arrangement, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Awards outstanding (in shares) | 104,419,000 |  |
Non-Management Directors | Del Taco RSUs subject to accelerated vesting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 12 months |  |
Awards outstanding (in shares) | 77,470 |  |
Management | Del Taco RSUs subject to accelerated vesting |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Awards outstanding (in shares) | 177,267 |  |
Two Thousand Four Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized (in shares) | 11,600,000 |  |
Common stock available for future issuance (in shares) | 1,987,156 |  |
Deferred Compensation Plan for Non-Management Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized (in shares) | 350,000 |  |
Common stock available for future issuance (in shares) | 106,576 |  |
2023 Omnibus Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized (in shares) | 2,500,000 |  |

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