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Business Combinations - Explosive Trace Detection (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Jun. 30, 2017
Allocation of total consideration to assets acquired and liabilities assumed    
Goodwill $ 300,716 $ 242,129
Explosive Trace Detection Business ("ETD")    
Business Combinations    
Decrease in goodwill (200)  
Decrease in accounts receivable reserve 1,200  
Decrease in fair value of inventory 800  
Increase in accrued liabilities 200  
Allocation of total consideration to assets acquired and liabilities assumed    
Cash and cash equivalents 4  
Accounts receivable, net 13,358  
Inventories 11,456  
Property and equipment 1,599  
Intangible assets 30,040  
Other long-term assets 297  
Accounts payable (4,784)  
Accrued payroll and related expenses (2,356)  
Deferred revenues - current (1,629)  
Accrued warranties (2,068)  
Other accrued expenses and current liabilities (1,582)  
Net assets acquired 44,335  
Goodwill 36,132  
Total consideration $ 80,467