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Restructuring (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
employee
Dec. 31, 2015
USD ($)
employee
Mar. 31, 2015
USD ($)
employee
Dec. 31, 2013
USD ($)
employee
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
employee
Restructuring Reserve [Roll Forward]                
Restructuring reserve, beginning balance   $ 0   $ 350 $ 0 $ 0 $ 350  
Restructuring charge $ 100 700 $ 400   753 412 152  
Payments for restructuring         (754) (403) (431)  
Restructuring reversals         (6) (9) (71)  
Restructuring foreign currency fluctuation         7      
Restructuring reserve, ending balance         0 0 0 $ 350
Employee Severance | 2016 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring reserve, beginning balance   0   0 0 0 0  
Restructuring charge         558 0 0  
Payments for restructuring         (559) 0 0  
Restructuring reversals         (6) 0 0  
Restructuring foreign currency fluctuation         7      
Restructuring reserve, ending balance         0 0 0 0
Employee Severance | 2015 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring reserve, beginning balance   0   0 0 0 0  
Restructuring charge         0 412 0  
Payments for restructuring         0 (403) 0  
Restructuring reversals         0 (9) 0  
Restructuring foreign currency fluctuation         0      
Restructuring reserve, ending balance         0 0 0 0
Employee Severance | 2014 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring reserve, beginning balance   0   0 0 0 0  
Restructuring charge         0 0 152  
Payments for restructuring         0 0 (152)  
Restructuring reversals         0 0 0  
Restructuring foreign currency fluctuation         0      
Restructuring reserve, ending balance         0 0 0 0
Employee Severance | 2013 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring reserve, beginning balance   0   350 0 0 350  
Restructuring charge         0 0 0  
Payments for restructuring         0 0 (279)  
Restructuring reversals       (100) 0 0 (71)  
Restructuring foreign currency fluctuation         0      
Restructuring reserve, ending balance         0 0 0 350
Facility Closing | 2016 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring reserve, beginning balance   $ 0   $ 0 0 0 0  
Restructuring charge         195 0 0  
Payments for restructuring         (195) 0 0  
Restructuring reversals         0 0 0  
Restructuring foreign currency fluctuation         0      
Restructuring reserve, ending balance         $ 0 $ 0 $ 0 $ 0
UNITED STATES | 2016 Restructuring                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost, Number of Positions Eliminated | employee 5 10            
Restructuring Reserve [Roll Forward]                
Restructuring charge   $ 700            
UNITED STATES | 2013 Restructuring                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost, Number of Positions Eliminated | employee               15
UNITED STATES | Employee Severance | 2016 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring charge $ 100 500            
UNITED STATES | Employee Severance | 2013 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring charge               $ 400
UNITED STATES | Facility Closing | 2016 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring charge   $ 200            
INDIA | 2015 Restructuring                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost, Number of Positions Eliminated | employee     38          
INDIA | 2014 Restructuring                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost, Number of Positions Eliminated | employee       40        
INDIA | Employee Severance | 2015 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring charge     $ 400          
INDIA | Employee Severance | 2014 Restructuring                
Restructuring Reserve [Roll Forward]                
Restructuring charge       $ 200