Name:	taco_Assetsretiredrelatedtosaleofcompanyoperatedrestaurants
Namespace Prefix:	taco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The number of company-operated restaurants sold to franchisees during the period.

No definition available.

Name:	taco_Companyoperatedrestaurantssoldtofranchisees
Namespace Prefix:	taco_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Other costs related to the sale of company-operated restaurants

No definition available.

Name:	taco_Othercostsrelatedtothesaleofcompanyoperatedrestaurants
Namespace Prefix:	taco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Unfavorable leasehold interests noncurrent.

No definition available.

Name:	taco_UnfavorableLeaseholdInterestsNoncurrent
Namespace Prefix:	taco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of net (unfavorable)/favorable lease assets/liabilities recorded during the period as a result of subleasing land, buildings and leasehold improvements to franchisees in connection with the sale of company-operated restaurants.

No definition available.

Name:	taco_Unfavorablefavorableleaseassetsliabilities
Namespace Prefix:	taco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Name:	us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FranchisorDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585