Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

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.

+ References

No definition available.

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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460

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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318

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Acquisition Details (Details) - USD ($)	3 Months Ended								12 Months Ended
Acquisition Details (Details) - USD ($)	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jan. 03, 2016	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Business Acquisition [Line Items]
Acquisition-related costs	$ 100,000	$ 500,000	$ 500,000	$ 700,000	$ 500,000	$ 200,000	$ 400,000	$ 800,000
Income tax expense, valuation allowance									$ 0	$ 30,374,000	$ (2,959,000)
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue of acquired restaurants since acquisition									64,900,000
Acquisition-related costs									1,800,000
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue of acquired restaurants since acquisition									70,800,000	28,600,000
Deferred income taxes	$ 6,668								$ 6,668	1,803
Acquisition-related costs										1,600,000
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue of acquired restaurants since acquisition										$ 70,400,000	12,900,000
Deferred income taxes								$ 3,311			3,311
Acquisition-related costs											$ 200,000
Off-Market Favorable Lease [Member] \| 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									15 years 2 months	15 years 5 months
Off-Market Favorable Lease [Member] \| 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life											15 years 6 months
Above Market Leases [Member] \| 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									14 years 3 months	12 years
Above Market Leases [Member] \| 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life											6 years 6 months
Franchise Rights [Member] \| 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									27 years 11 months	28 years
Franchise Rights [Member] \| 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life											26 years 7 months