Business Combination (Purchase Consideration) (Details) - USD ($) $ / shares in Units, $ in Thousands		7 Months Ended
	Mar. 08, 2022	Oct. 02, 2022	Oct. 01, 2023	Oct. 03, 2021	Sep. 27, 2020
Common Stock
Business Acquisition [Line Items]
Del Taco shares outstanding as of March 8, 2022 (in shares)		82,580,599	82,645,814	82,536,059	82,369,714
Total Del Taco shares outstanding (in shares)		82,580,599	82,645,814	82,536,059	82,369,714
Del Taco
Business Acquisition [Line Items]
Del Taco shares outstanding as of March 8, 2022 (in shares)	36,442,000		37,610,000
Total Del Taco shares outstanding (in shares)	36,442,000		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