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Goodwill and Other Identifiable Intangible Assets, Net (Additional Information) (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)
Goodwill [Line Items]
Number of Reportable Segments | segment	2
Goodwill	$ 341,916	$ 341,593
Enterprise Routers
Goodwill [Line Items]
Goodwill	32,700
Console Servers
Goodwill [Line Items]
Goodwill	57,100
OEM Solutions
Goodwill [Line Items]
Goodwill	64,200
Infrastructure Mgmt.
Goodwill [Line Items]
Goodwill	20,400
SmartSense
Goodwill [Line Items]
Goodwill	48,900
Ventus
Goodwill [Line Items]
Goodwill	118,600
IoT Products & Services Segment
Goodwill [Line Items]
Goodwill	174,357	173,957
IoT Solutions Segment
Goodwill [Line Items]
Goodwill	$ 167,559	$ 167,636

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