Operating Segment, Geographic Information and Significant Customers - Net Revenue by End Market (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 115,608	$ 107,317	$ 98,014	$ 87,649	$ 85,430	$ 65,898	$ 60,417	$ 58,409	$ 408,588	$ 270,154	$ 234,847
Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues									341,699	220,253	189,596
International/Foreign Military Sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues									$ 66,889	$ 49,901	$ 45,251