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Goodwill and other Identifiable Intangible Assets (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($) segment	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 435,897		$ 435,651
Accumulated amortization	(158,813)		(133,587)
Net	277,084		302,064
Goodwill	$ 341,593		340,477	$ 225,522
Number of operating segments \| segment	6
Number of reportable segments \| segment	2
IoT Solutions
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 167,636		167,546	50,342
Number of operating segments \| segment	2
IoT Products & Services
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 173,957		172,931	$ 175,180
Number of operating segments \| segment	4
Enterpise Routers
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 32,700
OEM Solutions
Finite-Lived Intangible Assets [Line Items]
Goodwill		64,600
Console Servers
Finite-Lived Intangible Assets [Line Items]
Goodwill		57,100
Infrastructure Mgmt.
Finite-Lived Intangible Assets [Line Items]
Goodwill		20,400
Ventus
Finite-Lived Intangible Assets [Line Items]
Goodwill		118,600
SmartSense
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 48,900
Purchased and Core Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 85,032		85,016
Accumulated amortization	(59,833)		(55,854)
Net	25,199		29,162
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	39,957		39,711
Accumulated amortization	(19,888)		(17,666)
Net	20,069		22,045
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	309,196		309,212
Accumulated amortization	(77,380)		(58,355)
Net	231,816		250,857
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	600		600
Accumulated amortization	(600)		(600)
Net	0		0
Order backlog
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,000		1,000
Accumulated amortization	(1,000)		(1,000)
Net	$ 0		$ 0