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Description of Business	3 Months Ended
Description of Business	Mar. 26, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Del Taco Restaurants, Inc. is a Delaware corporation headquartered in Lake Forest, California. The consolidated financial statements include the accounts of Del Taco Restaurants, Inc. and its wholly owned subsidiaries (collectively, the “Company” or “Del Taco”). The Company develops, franchises, owns, and operates Del Taco quick-service Mexican-American restaurants. At March 26, 2019, there were 312 company-operated and 271 franchise-operated Del Taco restaurants located in 14 states, including one franchise-operated unit in Guam. At March 27, 2018, there were 315 company-operated and 251 franchise-operated Del Taco restaurants located in 14 states, including one franchise-operated unit in Guam.