Operating Segment, Geographic Information and Significant Customers - Customers Comprising Ten Percent or more Revenues (Detail) - Revenues	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Revenue, Major Customer [Line Items]
Concentration risk, percent	22.00%	46.00%	15.00%
Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percent	43.00%	57.00%	43.00%
Customer Concentration Risk [Member] | Lockheed Martin Corporation
Revenue, Major Customer [Line Items]
Concentration risk, percent	23.00%	20.00%	18.00%
Customer Concentration Risk [Member] | Raytheon Company
Revenue, Major Customer [Line Items]
Concentration risk, percent	20.00%	37.00%	13.00%
Customer Concentration Risk [Member] | Northrop Grumman Corporation [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percent			12.00%