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Geographic and Service Group Information (Geographic Revenue from Continuing Operations before Reimbursement) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 27, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement |  |  |  |  |  |  |  |  | $ 282,472 | $ 285,887 | $ 276,599
Revenue from Continuing Operations Before Reimbursement [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement | $ 63,736 | $ 66,755 | $ 67,976 | $ 62,370 | $ 61,595 | $ 68,183 | $ 68,706 | $ 66,039 | 260,837 | 264,523 | 255,131
Revenue from Continuing Operations Before Reimbursement [Member] | North America [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement |  |  |  |  |  |  |  |  | 221,823 | 222,054 | 211,195
Revenue from Continuing Operations Before Reimbursement [Member] | International (Primarily European Countries) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement |  |  |  |  |  |  |  |  | $ 39,014 | $ 42,469 | $ 43,936

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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