Concentrations of Risk (Details)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Percent of Gross Accounts Receivable | Credit concentration risk | Raytheon Company
Concentration Risk [Line Items]
Concentrations of risk, percentage	37.00%	14.00%
Percent of Gross Accounts Receivable | Credit concentration risk | DRS RSTA, Inc
Concentration Risk [Line Items]
Concentrations of risk, percentage	12.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Military Customers in Total
Concentration Risk [Line Items]
Concentrations of risk, percentage	57.00%	60.00%	69.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Raytheon Company
Concentration Risk [Line Items]
Concentrations of risk, percentage	22.00%	23.00%	36.00%
Sales as a Percent of Total Revenue | Customer concentration risk | DRS RSTA, Inc
Concentration Risk [Line Items]
Concentrations of risk, percentage	21.00%	18.00%	18.00%
Sales as a Percent of Total Revenue | Customer concentration risk | QiOptiq Defense Inc
Concentration Risk [Line Items]
Concentrations of risk, percentage		10.00%	10.00%
Sales as a Percent of Total Revenue | Customer concentration risk | Ryoden Trading Company
Concentration Risk [Line Items]
Concentrations of risk, percentage	12.00%	15.00%	11.00%
Sales as a Percent of Total Revenue | United States Government Funded Research and Development Contracts
Concentration Risk [Line Items]
Concentrations of risk, percentage	10.00%	8.00%	5.00%