Operating Segment, Geographic Information and Significant Customers - Customers Comprising Ten Percent or more Revenues (Detail) - Sales Revenue, Net [Member]	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Concentration risk, percentage	11.00%	40.00%	10.00%	26.00%
Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	45.00%	55.00%	38.00%	54.00%
Customer Concentration Risk [Member] | Raytheon Company [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	22.00%	29.00%	19.00%	33.00%
Customer Concentration Risk [Member] | Lockheed Martin Corporation [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.00%	26.00%	19.00%	21.00%
Customer Concentration Risk [Member] | Northrop Grumman Corporation [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	10.00%