Concentrations of Risk and Major Customers - Additional Information (Detail) (Customer Concentration Risk)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Concentration Risk [Line Items]
Number of customer	2
Sales | Lockheed Martin
Concentration Risk [Line Items]
Concentration risk, percentage of consolidated net sales	20.70%
Sales | Diversified Systems, Inc
Concentration Risk [Line Items]
Concentration risk, percentage of consolidated net sales	10.10%
Sales | U S Government
Concentration Risk [Line Items]
Concentration risk, percentage of consolidated net sales	28.00%	31.00%
Sales | Foreign Country
Concentration Risk [Line Items]
Concentration risk, percentage of consolidated net sales	10.00%	12.00%