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Acquisitions Supplemental Pro Forma Information (Details) - Opengear - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Net sales | $ 70,338 | $ 74,946 |  | $ 220,998 | $ 229,831
Net income | $ 2,411 | $ 3,064 |  | $ 9,847 | $ 7,901
Net income per share - basic | $ 0.08 | $ 0.11 |  | $ 0.34 | $ 0.28
Net income per share - diluted | $ 0.08 | $ 0.11 |  | $ 0.33 | $ 0.28
Acquisition-related costs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition costs |  |  | $ 3,000 |  |

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