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General (Details) - USD ($)
$ in Thousands
1 Months Ended
Nov. 25, 2018
Dec. 31, 2019
Sep. 30, 2019
Apr. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]          
Goodwill   $ 1,340,617     $ 1,022,624
Night Vision Business          
Business Acquisition [Line Items]          
Net tangible assets and liabilities assumed (current and non-current)     $ 29,287    
Goodwill     211,727    
Consideration Transferred     351,514    
Universal          
Business Acquisition [Line Items]          
Net tangible assets and liabilities assumed (current and non-current)       $ 52,509  
Goodwill       31,060  
Consideration Transferred       123,581  
IMI Systems Ltd.          
Business Acquisition [Line Items]          
Net tangible assets and liabilities assumed (current and non-current) $ 39,405 26,559      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Tangible Assets And Liabilities Assumed Net Of Intangibles   (12,846)      
Business Combinations, Recognized Idenfiable Assets Acquired And Liabilities Assumed, Employee Benefit Liabilities, Net (386,101) (391,244)      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Employee Benefit Plans Liabilities, Net   (5,143)      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Premises Evacuation Receivable 370,089 355,162      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Premises Evacuation Receivable   (14,927)      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   67,030      
Goodwill 351,426 418,456      
Consideration Transferred 498,455 498,455      
Technology | Night Vision Business          
Business Acquisition [Line Items]          
Technology     $ 37,000    
Expected useful lives     8 years    
Technology | Universal          
Business Acquisition [Line Items]          
Technology       $ 21,128  
Expected useful lives       15 years  
Technology | IMI Systems Ltd.          
Business Acquisition [Line Items]          
Technology $ 52,905 18,791      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   (34,114)      
Expected useful lives 8 years        
Customer relationships | Night Vision Business          
Business Acquisition [Line Items]          
Technology     $ 67,000    
Expected useful lives     20 years    
Customer relationships | Universal          
Business Acquisition [Line Items]          
Technology       $ 13,924  
Expected useful lives       15 years  
Customer relationships | IMI Systems Ltd.          
Business Acquisition [Line Items]          
Technology $ 52,131 52,131      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   0      
Expected useful lives 10 years        
Customer Backlog [Member] | Night Vision Business          
Business Acquisition [Line Items]          
Technology     $ 6,500    
Expected useful lives     3 years    
Backlog | IMI Systems Ltd.          
Business Acquisition [Line Items]          
Technology $ 18,600 18,600      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles   $ 0      
Expected useful lives 10 years        
Trademark | Universal          
Business Acquisition [Line Items]          
Technology       $ 4,960  
Expected useful lives       20 years