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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Dec. 13, 2019 | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 227,533 | $ 210,135
Opengear |  |  |
Business Acquisition [Line Items] |  |  |
Cash | $ 148,058 |  |
Contingent consideration | 5,100 |  |
Total consideration transferred | 153,158 |  |
Fair value of net tangible assets acquired | 18,096 |  |
Deferred tax liability on identifiable intangible assets | (27,126) |  |
Goodwill | 57,088 |  |
Total assets acquired and liabilities assumed | 153,158 |  |
Customer Relationships | Opengear |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | 79,000 |  |
Purchased and Core Technology | Opengear |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | 18,100 |  |
Trademarks | Opengear |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 8,000 |  |

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