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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 06, 2021 | Mar. 26, 2021 | Dec. 13, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  | $ 19,108 | $ 136,098 | $ 0
Goodwill |  |  |  | 225,522 | $ 210,135 | $ 153,422
Ctek |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash | $ 12,012 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability | 300 |  |  | $ 300 |  |
Total consideration transferred | 12,734 |  |  |  |  |
Fair value of net tangible assets acquired | 397 |  |  |  |  |
Deferred tax liability on identifiable intangible assets | 1,000 |  |  |  |  |
Goodwill | 4,867 |  |  |  |  |
Total assets acquired and liabilities assumed | 12,734 |  |  |  |  |
Haxiot |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  | $ 7,100 |  |  |  |
Cash |  | 7,096 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability |  | 5,900 |  |  |  |
Total consideration transferred |  | 12,996 |  |  |  |
Fair value of net tangible assets acquired |  | 86 |  |  |  |
Deferred tax liability on identifiable intangible assets |  | 1,145 |  |  |  |
Goodwill |  | 8,605 |  |  |  |
Total assets acquired and liabilities assumed |  | 12,996 |  |  |  |
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 | Ctek |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets | 5,100 |  |  |  |  |
Customer Relationships | Haxiot |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  | 3,900 |  |  |  |
Customer Relationships | Opengear |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  | 79,000 |  |  |
Trademarks | Ctek |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets | 70 |  |  |  |  |
Trademarks | Haxiot |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  | 500 |  |  |  |
Trademarks | Opengear |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  | 8,000 |  |  |
Purchased and Core Technology | Ctek |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets | $ 1,300 |  |  |  |  |
Purchased and Core Technology | Haxiot |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  | $ 1,050 |  |  |  |
Purchased and Core Technology | Opengear |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 18,100 |  |  |

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