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Schedules of Concentration of Risk, by Risk Factor (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Accounts Receivable [Member] | Collins Aerospace Member
Concentration Risk [Line Items]
Concentrations of risk percentage	45.00%	23.00%
Accounts Receivable [Member] | DRS Network and Imaging Systems LLC Member
Concentration Risk [Line Items]
Concentrations of risk percentage	15.00%	22.00%
Accounts Receivable [Member] | Scott Safety Member
Concentration Risk [Line Items]
Concentrations of risk percentage		12.00%
Accounts Receivable [Member] | RealWear, Inc. [Member]
Concentration Risk [Line Items]
Concentrations of risk percentage		10.00%
Revenue Benchmark [Member] | Collins Aerospace Member
Concentration Risk [Line Items]
Concentrations of risk percentage	27.00%		20.00%
Revenue Benchmark [Member] | DRS Network and Imaging Systems LLC Member
Concentration Risk [Line Items]
Concentrations of risk percentage	35.00%	17.00%
Revenue Benchmark [Member] | RealWear, Inc. [Member]
Concentration Risk [Line Items]
Concentrations of risk percentage		20.00%
Revenue Benchmark [Member] | Defense Customers Member
Concentration Risk [Line Items]
Concentrations of risk percentage	50.00%	30.00%	36.00%
Revenue Benchmark [Member] | General Dynamics Member
Concentration Risk [Line Items]
Concentrations of risk percentage			11.00%
Revenue Benchmark [Member] | Funded Research and Development Contracts Member
Concentration Risk [Line Items]
Concentrations of risk percentage	25.00%	17.00%	20.00%

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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.

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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

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