Operating Segment, Geographic Information and Significant Customers - Customers Comprising Ten Percent or more Revenues (Detail) (Sales Revenue, Net [Member])	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Revenue, Major Customer [Line Items]
Concentration risk, percentage	57.00%
Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	65.00%	52.00%
Customer Concentration Risk [Member] | Raytheon Company [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	35.00%	13.00%
Customer Concentration Risk [Member] | Lockheed Martin Corporation [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	30.00%	12.00%
Customer Concentration Risk [Member] | Northrop Grumman Corporation [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage		16.00%
Customer Concentration Risk [Member] | BAE Systems PLC
Revenue, Major Customer [Line Items]
Concentration risk, percentage		11.00%