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Restructuring (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
[1]
Restructuring Reserve [Roll Forward]    
Reversals $ (67) $ 0
IoT Products & Services Segment    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 453  
Payments (359)  
Reversals (67)  
Foreign currency fluctuation (7)  
Restructuring Reserve 20  
IoT Products & Services Segment | Employee Termination Costs | Manufacturing Transition    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 147  
Payments (108)  
Reversals (19)  
Foreign currency fluctuation 0  
Restructuring Reserve 20  
IoT Products & Services Segment | Employee Termination Costs | 2017 Restructuring    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 293  
Payments (233)  
Reversals (53)  
Foreign currency fluctuation (7)  
Restructuring Reserve 0  
IoT Products & Services Segment | Contract Termination Costs | 2017 Restructuring    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 13  
Payments (18)  
Reversals 5  
Foreign currency fluctuation 0  
Restructuring Reserve $ 0  
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.