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Acquisitions Supplemental Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Opengear    
Business Acquisition [Line Items]    
Net sales $ 77,213 $ 75,667
Net income $ 3,499 $ 3,141
Net income per share - basic $ 0.12 $ 0.11
Net income per share - diluted $ 0.12 $ 0.11
Acquisition-related costs    
Business Acquisition [Line Items]    
Acquisition-related costs   $ 2,300