Acquisition Purchase Price Allocation, 2012 Acquisition (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 28, 2014	Dec. 30, 2012	Dec. 29, 2013
Business Acquisition [Line Items]
Cash		417
Inventory	1,267	3,336
Leasehold improvements	1,804	7,640
Restaurant equipment	5,818	20,955
Restaurant equipment - subject to capital lease	1,381	10,751
Franchise fees	2,096	3,470
Favorable leases	2,096	3,470
Deferred income taxes	1,526	2,465
Goodwill	17,793us-gaap_Goodwill	8,162us-gaap_Goodwill	8,162us-gaap_Goodwill
Capital lease obligation for restaurant equipment	(1,458)	(10,779)
Other liabilities	(135)	(174)
Unfavorable leases	(5,912)	(9,553)
Net assets acquired	52,200	74,537
May 30, 2012 Acquisition [Member]
Business Acquisition [Line Items]
Goodwill		6,712
Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years 5 months	14 years 8 months
Franchise Rights [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	30 years 5 months	33 years 6 months
Above Market Leases [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years 0 months	14 years 4 months

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.

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

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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Amount of capital lease obligation, assumed at the acquisition date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment, acquired at the acquisition date.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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