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Acquisitions Details (Details)				1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 13, 2019 USD ($)	Jan. 22, 2018 USD ($)	Oct. 20, 2017 USD ($)	Apr. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Change in fair value of contingent consideration							$ (128,000)		$ 1,190,000	$ 1,377,000
Operating lease right-of-use assets						$ 0	14,334,000		0
Operating lease liabilities						0	16,193,000		0
Opengear
Business Acquisition [Line Items]
Cash paid at closing	$ 148,058,000
Weighted average useful life identifiable intangibles	13 years 4 months 24 days
Opengear | General and Administrative
Business Acquisition [Line Items]
Acquisition costs						300,000	$ 2,700,000
Accelerated Concepts
Business Acquisition [Line Items]
Cash paid at closing		$ 16,400,000
Cash acquired		$ 200,000
Earn-out payment installment period		2
TempAlert
Business Acquisition [Line Items]
Cash paid at closing			$ 40,700,000
Cash acquired			$ 600,000
Maximum
Business Acquisition [Line Items]
Useful life identifiable intangibles							14 years 6 months
Earn-out payments | Accelerated Concepts
Business Acquisition [Line Items]
Earn-out payment maximum		$ 6,500,000
Change in fair value of contingent consideration				$ 3,500,000
Earn-out payments | Maximum | Opengear
Business Acquisition [Line Items]
Earn-out payment maximum								$ 5,000,000.0
Earn-out payments | Maximum | Forecast | Opengear
Business Acquisition [Line Items]
Earn-out payment maximum											$ 10,000,000.0
Customer Relationships | Opengear
Business Acquisition [Line Items]
Useful life identifiable intangibles	14 years 6 months
Purchased and Core Technology | Opengear
Business Acquisition [Line Items]
Useful life identifiable intangibles	9 years
Trademarks | Opengear
Business Acquisition [Line Items]
Useful life identifiable intangibles	12 years
Other non-current assets | Opengear
Business Acquisition [Line Items]
Operating lease right-of-use assets	$ 1,400,000
Other current liabilities and other non-current liabilities | Opengear
Business Acquisition [Line Items]
Operating lease liabilities	$ 1,700,000
Contingent Consideration | Opengear
Business Acquisition [Line Items]
Change in fair value of contingent consideration					$ 900,000
Contingent Consideration | Accelerated Concepts
Business Acquisition [Line Items]
Change in fair value of contingent consideration					$ 2,400,000				3,500,000
Contingent Consideration | TempAlert
Business Acquisition [Line Items]
Change in fair value of contingent consideration								$ 0
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration
Business Acquisition [Line Items]
Contingent consideration fair value						$ 5,407,000	$ 4,228,000		$ 5,407,000
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration | Opengear
Business Acquisition [Line Items]
Contingent consideration fair value							4,200,000
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration | Accelerated Concepts
Business Acquisition [Line Items]
Contingent consideration fair value		$ 2,300,000
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Contingent Consideration | TempAlert
Business Acquisition [Line Items]
Contingent consideration fair value							$ 0

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