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Concentrations of Risk (Details) | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 10.00% |  |
Percent of Gross Accounts Receivable | Credit concentration risk | Scott Safety [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 12.00% |  |
Percent of Gross Accounts Receivable | Credit concentration risk | RealWear, Inc. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 10.00% | 31.00% |
Percent of Gross Accounts Receivable | Credit concentration risk | DRS Technologies [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 22.00% | 11.00% |
Percent of Gross Accounts Receivable | Credit concentration risk | Collins Aerospace [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 23.00% | 11.00% |
Sales as a Percent of Total Revenue | Customer concentration risk | RealWear, Inc. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 20.00% |  |
Sales as a Percent of Total Revenue | Customer concentration risk | DRS Technologies [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 17.00% |  | 10.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Collins Aerospace [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage |  | 20.00% | 10.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Military Customers in Total |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 30.00% | 36.00% | 48.00%
Sales as a Percent of Total Revenue | Customer concentration risk | General Dynamics [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage |  | 11.00% |
Sales as a Percent of Total Revenue | Customer concentration risk | U.S. Army [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage |  |  | 12.00%
Sales as a Percent of Total Revenue | United States Government Funded Research and Development Contracts |  |  |
Concentration Risk [Line Items] |  |  |
Concentrations of risk, percentage | 17.00% | 20.00% | 11.00%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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