Operating Segment, Geographic Information and Significant Customers - Geographic Distribution of Revenues and Long Lived Assets from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 107,317	$ 65,898	$ 292,980	$ 184,724
Identifiable long-lived assets	47,356		47,356		$ 28,337
US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	98,599	62,675	273,054	178,249
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	8,085	1,742	14,747	2,852
Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	633	1,481	5,179	3,623
Reportable Geographical Components | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	100,344	64,273	279,979	183,049
Identifiable long-lived assets	45,890		45,890		28,187
Reportable Geographical Components | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	8,106	1,760	14,783	3,272
Identifiable long-lived assets	1,448		1,448		127
Reportable Geographical Components | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	633	1,481	5,179	3,623
Identifiable long-lived assets	18		18		23
Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	(1,766)	(1,616)	(6,961)	(5,220)
Identifiable long-lived assets	0		0		$ 0
Geography Eliminations | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	(1,745)	(1,598)	(6,925)	(4,800)
Geography Eliminations | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	(21)	(18)	(36)	(420)
Geography Eliminations | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	0	0	0	0
Domestic
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	87,765	52,054	244,343	149,826
International/Foreign Military Sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	19,552	13,844	48,637	34,898
Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	26,920	5,179	74,126	16,838
Modules and Sub-assemblies
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	43,330	34,061	115,744	90,680
Integrated Subsystems
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	37,067	26,658	103,110	77,206
Radar
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	33,017	39,207	115,308	103,925
Electronic Warfare
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	35,920	17,915	78,204	51,136
Other End Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 38,380	$ 8,776	$ 99,468	$ 29,663