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Concentrations of Risk (Details)	12 Months Ended
	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

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.

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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
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-Section 50
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-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

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