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Goodwill and other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Oct. 07, 2020 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | $ 224,643 |  |  | $ 225,059 |
Accumulated amortization | (106,614) |  |  | (103,811) |
Net | 118,029 |  |  | 121,248 |
Goodwill | 225,522 |  |  | 210,135 | $ 153,422
Enterpise Routers |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | $ 32,700 | $ 32,700 |  |
OEM Solutions |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | 63,400 | 53,300 |  |
Console Servers |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | 60,200 | 59,200 |  |
Infrastructure Mgmt. |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | 15,400 | 15,400 |  |
IoT Solutions |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | $ 49,500 | $ 49,500 |  |
Measurement Input, Control Premium [Member] | Maximum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill Valuation Implied Control Premium |  | 5.40% | 10.00% |  |
Measurement Input, Control Premium [Member] | Minimum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill Valuation Implied Control Premium |  | (4.50%) | 5.00% |  |
Purchased and Core Technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 69,162 |  |  | 76,011 |
Accumulated amortization | (50,701) |  |  | (55,482) |
Net | 18,461 |  |  | 20,529 |
License Agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 112 |  |  | 112 |
Accumulated amortization | (112) |  |  | (112) |
Net | 0 |  |  | 0 |
Patents and Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 23,491 |  |  | 22,836 |
Accumulated amortization | (14,978) |  |  | (13,535) |
Net | 8,513 |  |  | 9,301 |
Customer Relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 130,278 |  |  | 125,500 |
Accumulated amortization | (39,973) |  |  | (34,232) |
Net | 90,305 |  |  | 91,268 |
Non-compete Agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 600 |  |  | 600 |
Accumulated amortization | (600) |  |  | (450) |
Net | 0 |  |  | 150 |
Order backlog |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 1,000 |  |  | 0 |
Accumulated amortization | (250) |  |  | 0 |
Net | $ 750 |  |  | $ 0 |

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