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Description of Business	8 Months Ended
Description of Business	Sep. 10, 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 September 10, 2019, there were 312 company-operated and 274 franchise-operated Del Taco restaurants located in 14 states, including one franchise-operated unit in Guam. At September 11, 2018, there were 317 company-operated and 250 franchise-operated Del Taco restaurants located in 14 states, including one franchise-operated unit in Guam.