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Business Combinations - Explosive Trace Detection (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Allocation of total consideration to assets acquired and liabilities assumed    
Goodwill $ 285,880 $ 242,129
Explosive Trace Detection Business ("ETD")    
Business Combinations    
Increase in goodwill 2,500  
Allocation of total consideration to assets acquired and liabilities assumed    
Cash and cash equivalents 4  
Accounts receivable 12,113  
Inventories 12,217  
Property and equipment 1,599  
Intangible assets 30,040  
Other long term assets 301  
Accounts payable (4,784)  
Accrued payroll and related expenses (2,339)  
Deferred revenues - current (2,011)  
Accrued warranties (1,629)  
Other accrued expenses and current liabilities (1,376)  
Net assets acquired 44,135  
Goodwill 36,332  
Total consideration $ 80,467