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Operating Segment, Geographic Information and Significant Customers - Geographic Distribution of Revenues and Long Lived Assets from Continuing Operations (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2021
USD ($)
Dec. 27, 2019
USD ($)
Jan. 01, 2021
USD ($)
segment
Dec. 27, 2019
USD ($)
Jul. 03, 2020
USD ($)
Segment Reporting [Abstract]          
Number of operating segments | segment     1    
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues $ 210,676 $ 193,913 $ 416,297 $ 371,217  
Identifiable long-lived assets 125,397   125,397   $ 87,737
Components          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 40,679 60,310 90,975 113,729  
Modules and Sub-assemblies          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 34,993 29,524 52,459 64,764  
Integrated Subsystems          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 135,004 104,079 272,863 192,724  
Total Sensor & Effector          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 137,437 110,979 269,829 212,845  
Radar          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 84,760 48,328 157,169 86,247  
Electronic Warfare          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 28,672 36,139 65,560 72,196  
Other Sensor & Effector          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 24,005 26,512 47,100 54,402  
C4I          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 58,359 57,778 112,140 106,789  
Other End Applications          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 14,880 25,156 34,328 51,583  
Domestic          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 181,095 171,624 359,838 329,099  
International/Foreign Military Sales          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 29,581 22,289 56,459 42,118  
US          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 197,773 181,381 393,620 343,377  
Europe          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 12,812 11,721 22,475 26,161  
Asia Pacific          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 91 811 202 1,679  
Reportable Geographical Components | US          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 198,409 182,035 394,496 345,003  
Identifiable long-lived assets 119,455   119,455   82,588
Reportable Geographical Components | Europe          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 13,376 12,538 23,383 27,629  
Identifiable long-lived assets 5,935   5,935   5,144
Reportable Geographical Components | Asia Pacific          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 91 811 202 1,679  
Identifiable long-lived assets 7   7   5
Geography Eliminations          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues (1,200) (1,471) (1,784) (3,094)  
Identifiable long-lived assets 0   0   $ 0
Geography Eliminations | US          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 636 654 876 1,626  
Geography Eliminations | Europe          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues 564 817 908 1,468  
Geography Eliminations | Asia Pacific          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Net revenues $ 0 $ 0 $ 0 $ 0