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Significant Accounting Policies - Fiscal Year, Revenue Recognition and Advertising Costs (Details) - USD ($)	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Percentage of domestic restaurants franchised	80.00%
Length of fiscal year	364 days	364 days	364 days
Franchisee royalty fee for new and existing franchised restaurants (as a percent)	5.00%
Term of franchise agreement	10 years
Advertising and related costs	$ 56,700,000	$ 54,300,000	$ 60,800,000
Interest income on franchisee loans	2,100,000	800,000	$ 750,000
PJMF
Contributions for additional advertising	$ 15,000,000.0	$ 27,500,000
Papa Dough Rewards
Expiration window of rewards program	6 months
Minimum
Amortization term of equipment incentives	3 years
Maximum
Amortization term of equipment incentives	5 years

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The amortization term of equipment incentives.

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The expiration term of customer incentive programs.

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The franchisee royalty fee percent for new and existing franchised restaurants.

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- Definition

Represents the percentage of business units that are owned and/or operated in a franchise agreement by franchisees.

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- Definition

The term of franchise agreements.

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
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Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
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Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
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