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v3.21.2

Goodwill and Other Identifiable Intangible Assets, Net (Additional Information) (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($)
Goodwill [Line Items] |  |
Number of Reportable Segments | segment | 2 |
Goodwill | $ 221,331 | $ 210,135
Market Capitalization | 686,300 |
Enterprise Routers |  |
Goodwill [Line Items] |  |
Goodwill | 32,700 |
Console Servers |  |
Goodwill [Line Items] |  |
Goodwill | 60,200 |
OEM Solutions |  |
Goodwill [Line Items] |  |
Goodwill | 63,400 |
Infrastructure Mgmt. |  |
Goodwill [Line Items] |  |
Goodwill | 15,400 |
IoT Solutions Segment |  |
Goodwill [Line Items] |  |
Goodwill | 49,500 |
IoT Products & Services Segment |  |
Goodwill [Line Items] |  |
Goodwill | 170,710 | 160,365
IoT Solutions Segment |  |
Goodwill [Line Items] |  |
Goodwill | $ 50,621 | $ 49,770
Control Premium | Minimum |  |
Goodwill [Line Items] |  |
Goodwill Valuation Implied Control Premium | (4.50%) |
Control Premium | Maximum |  |
Goodwill [Line Items] |  |
Goodwill Valuation Implied Control Premium | 5.40% |

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