Operating Segment, Geographic Information and Significant Customers - Geographic Distribution of Revenues and Long Lived Assets from Continuing Operations (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 27, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 27, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			1
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 193,913	$ 159,089	$ 371,217	$ 303,145
Identifiable long-lived assets	72,696		72,696		$ 60,001
Components
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	60,381	40,914	113,800	81,314
Modules and Sub-assemblies
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	56,427	42,397	102,514	93,989
Integrated Subsystems
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	77,105	75,778	154,903	127,842
Total Sensor & Effector
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	110,979	89,160	212,845	167,851
Radar
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	48,328	42,008	86,247	82,987
Electronic Warfare
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	36,139	25,697	72,196	49,751
Other Sensor & Effector
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	26,512	21,455	54,402	35,113
C4I
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	57,778	47,276	106,789	91,500
Other End Applications
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	25,156	22,653	51,583	43,794
Domestic
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	171,624	142,906	329,099	273,485
International/Foreign Military Sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	22,289	16,183	42,118	29,660
US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	181,381	145,669	343,377	277,018
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	11,721	13,200	26,161	24,638
Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	811	220	1,679	1,489
Reportable Geographical Components | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	182,035	146,472	345,003	279,468
Identifiable long-lived assets	67,493		67,493		54,952
Reportable Geographical Components | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	12,538	13,545	27,629	25,341
Identifiable long-lived assets	5,195		5,195		5,037
Reportable Geographical Components | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	811	220	1,679	1,489
Identifiable long-lived assets	8		8		12
Geography Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	(1,471)	(1,148)	(3,094)	(3,153)
Identifiable long-lived assets	0		0		$ 0
Geography Eliminations | US
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	654	803	1,626	2,450
Geography Eliminations | Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	817	345	1,468	703
Geography Eliminations | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 0	$ 0	$ 0	$ 0