Operating Segment, Geographic Information and Significant Customers - Customers Comprising Ten Percent or more Revenues (Detail) - Revenues	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Revenue, Major Customer [Line Items]
Concentration risk, percent	46.00%	15.00%	10.00%
Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percent	57.00%	43.00%	38.00%
Customer Concentration Risk [Member] | Lockheed Martin Corporation
Revenue, Major Customer [Line Items]
Concentration risk, percent	20.00%	18.00%	17.00%
Customer Concentration Risk [Member] | Raytheon Company
Revenue, Major Customer [Line Items]
Concentration risk, percent	37.00%	13.00%	10.00%
Customer Concentration Risk [Member] | Northrop Grumman Corporation [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percent		12.00%	11.00%