Operating Segment, Geographic Information and Significant Customers - Geographic Distribution of Revenues and Long Lived Assets from Continuing Operations (Detail) $ in Thousands	3 Months Ended
	Sep. 27, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment	1
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 177,304	$ 144,056
Identifiable long-lived assets	65,946		$ 60,001
Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	53,419	40,400
Modules and Sub-assemblies
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	46,087	51,592
Integrated Subsystems
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	77,798	52,064
Total Sensor & Effector
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	101,866	78,691
Radar
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	37,919	40,979
Electronic Warfare
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	36,057	24,054
Other Sensor & Effector
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	27,890	13,658
C4I
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	49,011	44,224
Other End Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	26,427	21,141
Domestic
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	157,475	130,579
International/Foreign Military Sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	19,829	13,477
US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	161,996	131,349
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	14,440	11,438
Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	868	1,269
Reportable Geographical Components | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	162,968	132,996
Identifiable long-lived assets	60,653		54,952
Reportable Geographical Components | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	15,091	11,796
Identifiable long-lived assets	5,283		5,037
Reportable Geographical Components | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	868	1,269
Identifiable long-lived assets	10		12
Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	(1,623)	(2,005)
Identifiable long-lived assets	0		$ 0
Geography Eliminations | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	972	1,647
Geography Eliminations | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	651	358
Geography Eliminations | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 0	$ 0