Goodwill (Details 1) (USD $)	12 Months Ended
Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Goodwill
Goodwill, Beginning Balance	$ 79,391,000us-gaap_Goodwill	$ 78,958,000us-gaap_Goodwill
Foreign currency adjustments	(998,000)us-gaap_GoodwillTranslationAdjustments	433,000us-gaap_GoodwillTranslationAdjustments
Acquisitions	3,661,000us-gaap_GoodwillAcquiredDuringPeriod
Divestitures	(47,000)
Goodwill, Ending Balance	82,007,000us-gaap_Goodwill	79,391,000us-gaap_Goodwill	78,958,000us-gaap_Goodwill
Goodwill, Impairment Loss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Domestic Company-owned Restaurants
Goodwill
Goodwill, Beginning Balance	58,567,000
Acquisitions	3,661,000
Goodwill, Ending Balance	62,228,000		58,567,000
Number of restaurants acquired	13
International
Goodwill
Goodwill, Beginning Balance	20,388,000	19,955,000
Foreign currency adjustments	(998,000)	433,000
Divestitures	(47,000)
Goodwill, Ending Balance	19,343,000	20,388,000
Goodwill, accumulated impairment	2,300,000	2,300,000	2,300,000
Number of Restaurants Sold	4
All others
Goodwill
Goodwill, Ending Balance	$ 436,000	$ 436,000	$ 436,000

Number of restaurants acquired.

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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.

+ References

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

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

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Amount of increase (decrease) from foreign currency translation adjustments 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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Amount of divestiture 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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