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Business Segment Information (Details)
$ in Thousands
3 Months Ended
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
Dec. 24, 2014
Segment Reporting Information [Line Items]        
Number of business segments | segment 3      
Net Revenues $ 22,074 $ 12,396    
Operating Income (Loss) (3,929) (4,793)    
Identifiable Assets 113,395   $ 125,456  
Solar (1)        
Segment Reporting Information [Line Items]        
Net Revenues 9,543 8,286    
Operating Income (Loss) (1,864) (2,495)    
Identifiable Assets 40,229   45,717  
Semiconductor        
Segment Reporting Information [Line Items]        
Net Revenues 10,700 732    
Operating Income (Loss) (160) (100)    
Identifiable Assets 46,303   46,912  
Polishing        
Segment Reporting Information [Line Items]        
Net Revenues 1,831 3,378    
Operating Income (Loss) 169 742    
Identifiable Assets 5,395   5,793  
Non-segment related        
Segment Reporting Information [Line Items]        
Operating Income (Loss) (2,074) $ (2,940)    
Identifiable Assets $ 21,468   $ 27,034  
Product Concentration Risk | Sales Revenue, Product Line | Semiconductor        
Segment Reporting Information [Line Items]        
Concentration risk, percentage (less than 25%) 25.00%      
SoLayTec, B.V.        
Segment Reporting Information [Line Items]        
Percentage of voting interests acquired       51.00%