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Acquisitions Supplemental Pro Forma Information (Details) - Opengear - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |
Net sales | $ 73,447 | $ 79,218 |  | $ 150,660 | $ 154,885
Net income | $ 2,184 | $ 1,770 |  | $ 5,920 | $ 4,801
Net income per share - basic | $ 0.08 | $ 0.06 |  | $ 0.21 | $ 0.17
Net income per share - diluted | $ 0.07 | $ 0.06 |  | $ 0.20 | $ 0.17
Acquisition-related costs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition costs |  |  | $ 2,500 |  |

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