Operating Segment, Geographic Information and Significant Customers - Customers Comprising Ten Percent or more Revenues (Detail) - Sales Revenue, Net	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Revenue, Major Customer [Line Items]
Concentration risk, percentage	18.00%	12.00%	0.00%	23.00%
Customer Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk, percentage	41.00%	57.00%	39.00%	51.00%
Customer Concentration Risk | Raytheon Company
Revenue, Major Customer [Line Items]
Concentration risk, percentage	14.00%	17.00%	17.00%	28.00%
Customer Concentration Risk | Lockheed Martin Corporation
Revenue, Major Customer [Line Items]
Concentration risk, percentage	27.00%	26.00%	22.00%	23.00%
Customer Concentration Risk | Northrop Grumman Corporation
Revenue, Major Customer [Line Items]
Concentration risk, percentage		14.00%