Operating Segment, Geographic Information and Significant Customers - Customers Comprising Ten Percent or more Revenues (Detail) - Sales Revenue, Net [Member]	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Revenue, Major Customer [Line Items]
Concentration risk, percentage	12.00%	49.00%	23.00%	43.00%
Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	57.00%	56.00%	51.00%	58.00%
Customer Concentration Risk [Member] | Raytheon Company [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	17.00%	37.00%	28.00%	36.00%
Customer Concentration Risk [Member] | Lockheed Martin Corporation [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	26.00%	19.00%	23.00%	22.00%
Customer Concentration Risk [Member] | Northrop Grumman Corporation [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	14.00%