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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jan. 30, 2015
Business Acquisition [Line Items]      
Goodwill $ 10,535 $ 8,323  
Goodwill recognized due to acquisitions 7,681    
BTU International, Inc (BTU) Merger      
Business Acquisition [Line Items]      
Fair value of net tangible assets acquired     $ 19,232
Goodwill     4,463
Identifiable intangible assets     2,930
Total consideration allocated     $ 26,625
Transaction-related expenses 4,000 1,300  
Trade names | BTU International, Inc (BTU) Merger      
Business Acquisition [Line Items]      
Finite-lived Intangible Assets Acquired $ 1,200    
Useful Life (in years) 15 years    
Customer lists      
Business Acquisition [Line Items]      
Useful Life (in years) 10 years    
Customer lists | BTU International, Inc (BTU) Merger      
Business Acquisition [Line Items]      
Finite-lived Intangible Assets Acquired $ 1,700    
Useful Life (in years) 6 years    
Semiconductor      
Business Acquisition [Line Items]      
Goodwill $ 4,463 $ 0  
Goodwill recognized due to acquisitions 4,463    
Semiconductor | BTU International, Inc (BTU) Merger      
Business Acquisition [Line Items]      
Goodwill recognized due to acquisitions $ 4,500