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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