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Restructuring (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2017
USD ($)
employee
Jun. 30, 2020
USD ($)
employee
Mar. 31, 2020
USD ($)
employee
Sep. 30, 2018
USD ($)
employee
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Restructuring Reserve [Roll Forward]              
Restructuring reserve, beginning balance         $ 0 $ 453 $ 1,656
Restructuring charge         133   504
Payments for restructuring         (117) (359) (1,553)
Restructuring reversals         (16) (87) (203)
Restructuring foreign currency fluctuation           (7) 49
Restructuring reserve, ending balance       $ 453 0 0 453
Employee Severance | 2020 Restructuring              
Restructuring Reserve [Roll Forward]              
Restructuring reserve, beginning balance         0 0 0
Restructuring charge         133   0
Payments for restructuring         (117) 0 0
Restructuring reversals         (16) 0 0
Restructuring foreign currency fluctuation           0 0
Restructuring reserve, ending balance       0 0 0 0
Employee Severance | Manufacturing Transition              
Restructuring Reserve [Roll Forward]              
Restructuring reserve, beginning balance         0 147 0
Restructuring charge         0   504
Payments for restructuring         0 (108) (357)
Restructuring reversals         0 (39) 0
Restructuring foreign currency fluctuation           0 0
Restructuring reserve, ending balance       147 0 0 147
Employee Severance | 2017 Restructuring              
Restructuring Reserve [Roll Forward]              
Restructuring reserve, beginning balance         0 293 1,528
Restructuring charge         0   0
Payments for restructuring         0 (233) (1,035)
Restructuring reversals         0 (53) (244)
Restructuring foreign currency fluctuation           (7) 44
Restructuring reserve, ending balance       293 0 0 293
Facility Closing | 2017 Restructuring              
Restructuring Reserve [Roll Forward]              
Restructuring reserve, beginning balance         0 13 128
Restructuring charge         0   0
Payments for restructuring         0 (18) (161)
Restructuring reversals         0 5 41
Restructuring foreign currency fluctuation           0 5
Restructuring reserve, ending balance       $ 13 $ 0 $ 0 $ 13
IoT Products & Services | 2020 Restructuring              
Restructuring Cost and Reserve [Line Items]              
Number of positions eliminated | employee     2        
IoT Products & Services | Manufacturing Transition              
Restructuring Cost and Reserve [Line Items]              
Number of positions eliminated | employee       53      
IoT Products & Services | 2017 Restructuring              
Restructuring Reserve [Roll Forward]              
Restructuring charge $ 2,500            
IoT Products & Services | Employee Severance | 2020 Restructuring              
Restructuring Reserve [Roll Forward]              
Restructuring charge     $ 38        
IoT Products & Services | Employee Severance | Manufacturing Transition              
Restructuring Reserve [Roll Forward]              
Restructuring charge       $ 500      
IoT Products & Services | Employee Severance | 2017 Restructuring              
Restructuring Reserve [Roll Forward]              
Restructuring charge 2,300            
IoT Products & Services | Contract Termination | 2017 Restructuring              
Restructuring Reserve [Roll Forward]              
Restructuring charge $ 200            
IoT Products & Services | UNITED STATES | 2017 Restructuring              
Restructuring Cost and Reserve [Line Items]              
Number of positions eliminated | employee 10            
IoT Products & Services | FRANCE | 2017 Restructuring              
Restructuring Cost and Reserve [Line Items]              
Number of positions eliminated | employee 8            
IoT Solutions | 2020 Restructuring              
Restructuring Cost and Reserve [Line Items]              
Number of positions eliminated | employee   22          
IoT Solutions | Employee Severance | 2020 Restructuring              
Restructuring Reserve [Roll Forward]              
Restructuring charge   $ 95