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Goodwill and other Identifiable Intangible Assets (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2024 USD ($) segment	Jun. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 436,311		$ 435,897
Accumulated amortization	(183,402)		(158,813)
Net	252,909		277,084
Goodwill	$ 342,774		341,593	$ 340,477
Number of operating segments \| segment	2
Number of reportable segments \| segment	2
Number of Reporting Units \| segment	6
IoT Solutions
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 167,681		167,636	167,546
Number of Reporting Units \| segment	2
IoT Products & Services
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 175,093		173,957	$ 172,931
Number of Reporting Units \| segment	4
Enterpise Routers
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 32,700
OEM Solutions
Finite-Lived Intangible Assets [Line Items]
Goodwill		64,200
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	$ 85,041		85,032
Accumulated amortization	(63,654)		(59,833)
Net	21,387		25,199
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	40,335		39,957
Accumulated amortization	(22,047)		(19,888)
Net	18,288		20,069
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	309,223		309,196
Accumulated amortization	(95,989)		(77,380)
Net	213,234		231,816
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