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Concentrations of Risk (Details) | 12 Months Ended
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Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Percent of Gross Accounts Receivable | Credit concentration risk | Company B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage | 19.00% | 21.00% |  |
Percent of Gross Accounts Receivable | Credit concentration risk | Company D |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage | 21.00% | 15.00% |  |
Percent of Gross Accounts Receivable | Credit concentration risk | Company G |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage | 18.00% |  |  |
Sales as a Percent of Total Revenue | Customer concentration risk | Company A |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage |  | 18.00% |  | 26.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Company C |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage |  | 22.00% | 11.00% |
Sales as a Percent of Total Revenue | Customer concentration risk | Company E |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage | 12.00% |  |  |
Sales as a Percent of Total Revenue | Customer concentration risk | Company F |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage |  | 20.00% |  |
Sales as a Percent of Total Revenue | Customer concentration risk | Military Customers in Total |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage | 24.00% | 32.00% |  | 45.00%
Sales as a Percent of Total Revenue | United States Government Funded Research and Development Contracts |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentrations of risk, percentage | 7.00% | 12.00% |  | 15.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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