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Summary of Significant Accounting Policies (Property, Fixtures and Equipment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 25, 2022 | Dec. 26, 2021
Property, Plant and Equipment [Line Items] |  |  |  |
Capitalized internal costs for construction in progress |  | $ 5.4 | $ 4.1 | $ 3.7
Capitalized computer equipment and software, additions |  | 12.4 | 9.2 |
Property, fixtures and equipment, net |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Capitalized computer equipment and software, net |  | $ 14.3 | $ 10.1 |
Buildings | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life | [1] | 5 years |  |
Buildings | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life | [1] | 30 years |  |
Furniture and fixtures | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life |  | 5 years |  |
Furniture and fixtures | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life |  | 7 years |  |
Equipment | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life |  | 2 years |  |
Equipment | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life |  | 7 years |  |
Computer equipment and software | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life |  | 2 years |  |
Computer equipment and software | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, useful life |  | 7 years |  |
[1] | Includes improvements to leased properties which are depreciated over the shorter of their useful life or the reasonably certain lease term, including renewal periods that are reasonably certain.

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 + Details
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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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