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Restructuring (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2017 employee | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) employee | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) employee | Sep. 30, 2016 USD ($)
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  |  |  |  | $ 453 | $ 1,656 | $ 0 | $ 0
Restructuring charge |  | $ 100 | $ 200 |  | $ 2,500 |  |  | 504 | 2,515 | 753
Payments for restructuring |  |  |  |  |  |  |  | (1,553) | (986) | (754)
Restructuring reversals |  |  |  |  |  |  |  | (202) |  | (6)
Restructuring foreign currency fluctuation |  |  |  |  |  |  |  | 48 | 127 | 7
Restructuring reserve, ending balance |  | 453 |  | $ 1,656 |  | $ 453 |  | 453 | 1,656 | 0
Employee Severance | Manufacturing Transition |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  |  |  |  | 147 | 0 | 0 | 0
Restructuring charge |  |  |  |  |  |  |  | 504 | 0 | 0
Payments for restructuring |  |  |  |  |  |  |  | (357) | 0 | 0
Restructuring reversals |  |  |  |  |  |  |  | 0 |  | 0
Restructuring foreign currency fluctuation |  |  |  |  |  |  |  | 0 | 0 | 0
Restructuring reserve, ending balance |  | 147 |  | 0 |  | 147 |  | 147 | 0 | 0
Employee Severance | 2017 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  |  |  |  | 293 | 1,528 | 0 | 0
Restructuring charge |  |  |  |  |  |  |  | 0 | 2,258 | 0
Payments for restructuring |  |  |  |  |  |  |  | (1,035) | (845) | 0
Restructuring reversals |  |  |  |  |  |  |  | (244) |  | 0
Restructuring foreign currency fluctuation |  |  |  |  |  |  |  | 44 | 115 | 0
Restructuring reserve, ending balance |  | 293 |  | 1,528 |  | 293 |  | 293 | 1,528 | 0
Employee Severance | 2016 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  |  |  |  | 0 | 0 | 0 | 0
Restructuring charge |  |  |  |  |  |  |  | 0 | 0 | 558
Payments for restructuring |  |  |  |  |  |  |  | 0 | 0 | (559)
Restructuring reversals |  |  |  |  |  |  |  | 0 |  | (6)
Restructuring foreign currency fluctuation |  |  |  |  |  |  |  | 0 | 0 | 7
Restructuring reserve, ending balance |  | 0 |  | 0 |  | 0 |  | 0 | 0 | 0
Facility Closing | 2017 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  |  |  |  | 13 | 128 | 0 | 0
Restructuring charge |  |  |  |  |  |  |  | 0 | 257 | 0
Payments for restructuring |  |  |  |  |  |  |  | (161) | (141) | 0
Restructuring reversals |  |  |  |  |  |  |  | 42 |  | 0
Restructuring foreign currency fluctuation |  |  |  |  |  |  |  | 4 | 12 | 0
Restructuring reserve, ending balance |  | 13 |  | 128 |  | 13 |  | 13 | 128 | 0
Facility Closing | 2016 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  |  |  |  | 0 | 0 | 0 | 0
Restructuring charge |  |  |  |  |  |  |  | 0 | 0 | 195
Payments for restructuring |  |  |  |  |  |  |  | 0 | 0 | (195)
Restructuring reversals |  |  |  |  |  |  |  | 0 |  | 0
Restructuring foreign currency fluctuation |  |  |  |  |  |  |  | 0 | 0 | 0
Restructuring reserve, ending balance |  | $ 0 |  | 0 |  | $ 0 |  | $ 0 | $ 0 | $ 0
UNITED STATES | 2016 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated | employee |  |  |  |  |  |  |  |  | 5 |
UNITED STATES | Employee Severance | 2016 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring charge |  |  |  |  |  |  |  |  | $ 100 |
GERMANY | 2016 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated | employee |  |  |  |  |  |  |  |  | 10 |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring charge |  |  |  |  |  |  |  |  | $ 700 |
GERMANY | Employee Severance | 2016 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring charge |  |  |  |  |  |  |  |  | 500 |
GERMANY | Facility Closing | 2016 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring charge |  |  |  |  |  |  |  |  | $ 200 |
IoT Products & Services | Manufacturing Transition |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated | employee |  |  |  |  |  | 51 |  |  |  |
IoT Products & Services | 2017 Restructuring |  |  |  |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |
Restructuring charge |  |  |  | 2,500 |  |  |  |  |  |
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 | Facility Closing | 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 |  |  |  |  |  |  |  |  |
Minimum | Forecast | IoT Products & Services | Manufacturing Transition |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Effect on future earnings |  |  |  |  |  |  | 3,000 |  |  |
Maximum | Forecast | IoT Products & Services | Manufacturing Transition |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Effect on future earnings |  |  |  |  |  |  | $ 5,000 |  |  |

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