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Lease Commitments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Lessee Lease Description [Line Items] |  |  |
Weighted average remaining lease term | 5 years |  |
Weighted average discount rate | 4.00% |  |
Operating lease payments | $ 2.5 |  |
Lease expense | $ 2.8 | $ 2.8 | $ 2.4
Lessee, operating lease not yet commenced description | As of December 27, 2019, the Company does not have any additional operating leases that have not yet commenced that create significant rights and obligations for the Company. |  |
Five Year Opt-Out Option for London Office Lease [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Weighted average remaining lease term | 3 years 2 months 12 days |  |
London Office Lease [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating lease opt-out option | 5 years |  |
Minimum [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating leases terms | 1 year |  |
Maximum [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Operating leases terms | 10 years |  |

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- Definition Description of lessee's operating lease that has not yet commenced. Including, but not limited to, nature of involvement with construction or design of underlying asset for lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease renewal, 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee'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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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