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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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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