Goodwill and Other Identifiable Intangible Assets, Net (Additional Information) (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Goodwill [Line Items]
Number of Reportable Segments | segment	2
Goodwill	$ 342,292	$ 340,477
Enterprise Routers
Goodwill [Line Items]
Goodwill	32,700
Console Servers
Goodwill [Line Items]
Goodwill	57,100
OEM Solutions
Goodwill [Line Items]
Goodwill	64,600
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	174,746	172,931
IoT Solutions Segment
Goodwill [Line Items]
Goodwill	$ 167,546	$ 167,546