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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
12 Months Ended 20 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2016
Sep. 30, 2017
Jan. 30, 2015
Business Acquisition [Line Items]          
Goodwill     $ 11,119 $ 11,405  
BTU International, Inc (BTU) Merger          
Business Acquisition [Line Items]          
Fair value of net tangible assets acquired     18,632   $ 19,232
Measurement period adjustments, fair value of net tangible assets acquired     (600)    
Goodwill     5,063   4,463
Measurement period adjustments, goodwill     600    
Identifiable intangible assets     2,930   2,930
Measurement period adjustments, identifiable intangible assets     0    
Total consideration allocated     26,625   $ 26,625
Measurement period adjustments, total consideration allocated     $ 0    
Transaction-related expenses $ 4,000 $ 1,300