Document And Entity Information - shares	6 Months Ended
	Jun. 16, 2015	Jul. 27, 2015
Document Information [Line Items]
Entity Registrant Name	Del Taco Restaurants, Inc.
Entity Central Index Key	0001585583
Current Fiscal Year End Date	--12-29
Entity Filer Category	Accelerated Filer
Trading Symbol	TACO
Entity Common Stock, Shares Outstanding		38,802,425
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 16, 2015
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2015