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Geographic and Service Group Information (Long-Lived Assets Attributable To Geographic Area) (Details) - USD ($) $ in Thousands	Dec. 29, 2017	Dec. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 109,946	$ 90,486
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	90,605	78,200
International (Primarily European Countries) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 19,341	$ 12,286

X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

+ Details

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Balance Type:	debit
Period Type:	instant

X

- 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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X

- Details

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Period Type: