Business Combination (Purchase Consideration) (Details) - USD ($) $ / shares in Units, $ in Thousands		7 Months Ended	12 Months Ended
	Mar. 08, 2022	Oct. 02, 2022	Sep. 29, 2024	Oct. 01, 2023	Oct. 02, 2022	Oct. 03, 2021
Business Acquisition [Line Items]
Consideration transferred			$ 86	$ 0	$ 297
Common Stock
Business Acquisition [Line Items]
Del Taco shares outstanding as of March 8, 2022 (in shares)		82,580,599	82,825,851	82,645,814	82,580,599	82,536,059
Total Del Taco shares outstanding (in shares)		82,580,599	82,825,851	82,645,814	82,580,599	82,536,059
Del Taco
Business Acquisition [Line Items]
Del Taco shares outstanding as of March 8, 2022 (in shares)	36,442,000	37,610,000			37,610,000
Total Del Taco shares outstanding (in shares)	36,442,000	37,610,000			37,610,000
Total cash consideration paid to selling shareholders	$ 470,500
Business acquisition, transaction costs	7,141
Replacement share-based payment awards pre-combination vesting expense	449
Consideration transferred	593,309
Del Taco | Syndicated Credit Facility | Del Taco
Business Acquisition [Line Items]
Del Taco closing indebtedness settled by Jack in the Box	$ 115,219
Del Taco | Common Stock
Business Acquisition [Line Items]
Merger Consideration (per Del Taco share) (in dollars per share)	$ 12.51
Del Taco | Del Taco RSAs subject to accelerated vesting
Business Acquisition [Line Items]
Del Taco subject to accelerated vesting (in shares)		805,000
Del Taco | Del Taco RSUs subject to accelerated vesting
Business Acquisition [Line Items]
Del Taco subject to accelerated vesting (in shares)		70,000
Del Taco | Del Taco options subject to accelerated vesting
Business Acquisition [Line Items]
Del Taco subject to accelerated vesting (in shares)		292,000