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Revenues Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2019	Mar. 28, 2018
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 151,411	$ 155,273
Franchisor Owned Outlet [Member]
Disaggregation of Revenue [Line Items]
Total operating revenue	98,545	101,193
Franchisor Owned Outlet [Member] | Sales Channel, Directly to Consumer [Member]
Disaggregation of Revenue [Line Items]
Total operating revenue	98,545	101,193
Royalties [Member] | Sales Channel, Through Intermediary [Member]
Disaggregation of Revenue [Line Items]
Total operating revenue	25,240	25,165
Advertising [Member] | Sales Channel, Through Intermediary [Member]
Disaggregation of Revenue [Line Items]
Total operating revenue	18,942	19,310
Initial and other fees [Member] | Sales Channel, Through Intermediary [Member]
Disaggregation of Revenue [Line Items]
Total operating revenue	1,139	1,417
Occupancy [Member] | Sales Channel, Through Intermediary [Member]
Disaggregation of Revenue [Line Items]
Total operating revenue	7,545	8,188
Franchise [Member]
Disaggregation of Revenue [Line Items]
Total operating revenue	52,866	54,080
Franchise [Member] | Sales Channel, Through Intermediary [Member]
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 52,866	$ 54,080

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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