System Optimization Gains, Net Summary of Disposition Activity (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 04, 2021 USD ($) number_of_restaurants	Jun. 28, 2020 USD ($) number_of_restaurants	Jul. 04, 2021 USD ($) number_of_restaurants	Jun. 28, 2020 USD ($) number_of_restaurants	Jan. 01, 2017
System optimization gains, net
Company-operated restaurant ownership percentage					5.00%
Proceeds from sales of restaurants			$ 50,531	$ 4,320
Gain on sales-type leases	$ 1,627	$ 569	3,539	1,197
System optimization gains, net	$ 30,766	$ 1,987	$ 31,282	$ 2,310
Sale of franchise-operated restaurant to franchisee
System optimization gains, net
Number of restaurants sold to franchisees \| number_of_restaurants			19	3
Sale of company-operated restaurants to franchisees
System optimization gains, net
Number of restaurants sold to franchisees \| number_of_restaurants	47	0	47	0
Proceeds from sales of restaurants	$ 50,518	$ 0	$ 50,518	$ 0
Net Assets Sold	(16,939)	0	(16,939)	0
Goodwill related to sales of restaurants	(4,847)	0	(4,847)	0
Net unfavorable leases	(2,939)	0	(2,939)	0
Gain on sales-type leases	7,156	0	7,156	0
Other	(2,148)	0	(2,148)	0
Gain on sale of restaurants, net, before post-closing adjustments	30,801	0	30,801	0
Post closing adjustments on sales of restaurants	0	0	515	345
System optimization gains, net	30,801	0	31,316	345
Favorable lease	3,799		3,799
Unfavorable lease	6,738		6,738
Deferred gain on sale of property	3,500		3,500
Sale of other assets
System optimization gains, net
Proceeds from sales of restaurants	10	4,125	13	4,320
System optimization gains, net	$ (35)	$ 1,987	$ (34)	$ 1,965

Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

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This element represents the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Amount of increase (decrease) 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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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of profit (loss) for sales-type lease and (loss) for direct financing lease recognized at commencement.

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The number of franchises sold during the period when there are significant changes in franchisor-owned outlets or franchised outlets during the period.

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Approximate Company-operated restaurant ownership percentage

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Gain (loss) on disposition of restaurants to franchisees as part of the system optimization initiative, before the impact of post closing purchase price adjustments on previously completed dispositions.

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Net Assets Sold

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Net Lease Assets (Liabilities) - Net of favorable lease assets and unfavorable lease liabilities as a result of the lease and/or sublease of land, buildings, and/or leasehold improvements to franchisees, in connection with sales of restaurants.

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Other gain (loss) on disposition, net

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Post Closing Adjustments on Sales of Restaurants

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