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Acquisitions Supplemental Pro Forma Information (Details) - Opengear - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |
Net sales |  | $ 294,167 | $ 308,986
Net income |  | $ 14,366 | $ 10,417
Net income per share - basic |  | $ 0.50 | $ 0.37
Net income per share - diluted |  | $ 0.49 | $ 0.36
Acquisition-related costs |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs | $ 3,100 |  |

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