The number of franchisees with outstanding balances due the entity.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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.

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No definition available.

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- Definition

Represents the number of restaurants.

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The number of states the entity operates in as of the balance sheet date.

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No definition available.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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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BASIS OF PRESENTATION (Details) $ in Thousands	3 Months Ended
BASIS OF PRESENTATION (Details) $ in Thousands	Mar. 31, 2019 USD ($) restaurant item state	Apr. 01, 2018	Dec. 30, 2018 USD ($)
Franchisor Disclosure Line Items
Number Of Restaurants \| restaurant	138
Number of States in which Entity Operates \| state	33
Effective Income Tax Rate, Continuing Operations	17.20%	24.30%
Restricted Cash And Cash Equivalents	$ 840		$ 842
Number of franchisees with outstanding balances due \| item	2
Accounts receivable, net	$ 3,194		4,300
Customer Concentration Risk [Member] \| Franchisee One
Franchisor Disclosure Line Items
Accounts receivable, net	704
Customer Concentration Risk [Member] \| Franchisee Two
Franchisor Disclosure Line Items
Accounts receivable, net	$ 386
Entity Operated Units [Member]
Franchisor Disclosure Line Items
Number Of Restaurants \| restaurant	21
Franchised Units [Member]
Franchisor Disclosure Line Items
Number Of Restaurants \| restaurant	117
Public Relations and Marketing Development Fund [Member]
Franchisor Disclosure Line Items
Restricted Cash And Cash Equivalents	$ 697		700
Cash Restricted for Letters of Credit [Member]
Franchisor Disclosure Line Items
Restricted Cash And Cash Equivalents	$ 143		$ 143