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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

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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