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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