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Acquisitions (Tables) | 6 Months Ended
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Mar. 31, 2020
Business Combinations [Abstract] |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] | The following table summarizes the preliminary values of Opengear assets acquired and liabilities assumed as of the acquisition date (in thousands):
Cash |  | $ | 148,058 |
Contingent consideration |  | 5,100 |
Total |  | $ | 153,158 |
Fair value of net tangible assets acquired |  | $ | 19,006 |
Identifiable intangible assets: |  |
Customer relationships |  | 79,000 |
Purchased and core technology |  | 18,100 |
Trademarks |  | 8,000 |
Deferred tax liability on identifiable intangible assets |  | (25,634 | )
Goodwill |  | 54,686 |
Total |  | $ | 153,158 |
Business Acquisition, Pro Forma Information [Table Text Block] | The following consolidated pro forma information is presented as if the acquisition had occurred on October 1, 2018 (in thousands):
| Three months ended March 31, |  | Six months ended March 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
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 |

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + 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)(2) -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)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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