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Business Acquisitions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Jan. 06, 2017
Oct. 14, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Nov. 10, 2016
Business Acquisition [Line Items]                
Goodwill       $ 47,882   $ 47,882 $ 34,371  
TIW Corporation [Member]                
Business Acquisition [Line Items]                
Stock purchase agreement, par value of common stock (in dollars per share)   $ 100.0            
Cash purchase price as a result of business acquisition   $ 142,700            
Acquisition costs           $ 2,500    
Goodwill   $ 34,400           $ 34,371
Revenues     $ 163,919 25,700 $ 351,979      
Pre-tax operating loss     $ 37,916 (8,700) $ 74,653      
Net income (loss) from business acquisition       $ (6,600)        
Technology Alliance Inc. [Member]                
Business Acquisition [Line Items]                
Cash purchase price as a result of business acquisition $ 20,000