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Leases - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2025 USD ($) restaurant lease	Sep. 29, 2024 USD ($)	Sep. 28, 2025 USD ($) restaurant lease	Sep. 29, 2024 USD ($)
Lessee, Lease, Description [Line Items]
Sublease income	$ 2.4	$ 2.7	$ 7.8	$ 7.1
Number of domestic leases for which the Company is contingently liable | lease	70		70
Estimated maximum amount of undiscounted payments in the event of nonpayment by primary lessees	$ 8.9		$ 8.9
Minimum
Lessee, Lease, Description [Line Items]
Initial term of franchise subleases	5 years		5 years
Maximum
Lessee, Lease, Description [Line Items]
Initial term of franchise subleases	10 years		10 years
United Kingdom franchise-owned restaurants
Lessee, Lease, Description [Line Items]
Number of units leased and subleased | restaurant	340		340
Initial lease terms on franchised sites	15 years		15 years

X

- Definition

The total contingent liability assumed in the sale of a business.

+ References

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- Definition

The number of leases for which the Company is contingently liable.

+ References

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- Definition

Lessor, Operating Lease, Sublease, Term Of Contract

+ References

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- Definition

Number of units leased as lessor.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

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- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 4
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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