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Geographic and Service Group Information (Long-Lived Assets Attributable To Geographic Area) (Details) - USD ($) $ in Thousands | Dec. 27, 2019 | Dec. 28, 2018
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total long-lived assets | $ 115,108 | $ 107,661
North America [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total long-lived assets | 91,309 | 88,317
International (Primarily European Countries) [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total long-lived assets | $ 23,799 | $ 19,344

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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Balance Type: | debit
Period Type: | instant

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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 No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |