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Business Combinations - American Science and Engineering (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 09, 2016
Allocation of total consideration to assets acquired and liabilities assumed      
Goodwill $ 282,656 $ 242,129  
AS&E      
Business Combinations      
Percentage of ownership acquired     100.00%
Cash on hand to pay down the revolving bank line of credit     $ 69,000
Fair value adjustment $ 0    
Allocation of total consideration to assets acquired and liabilities assumed      
Current assets     138,747
Intangible assets     74,800
Other long term assets     5,538
Current liabilities     (42,111)
Long-term liabilities     (26,809)
Net assets acquired     150,165
Goodwill     115,838
Total consideration     $ 266,003