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Fair Value Measurements (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 05, 2015 | Apr. 30, 2020 | Mar. 31, 2021 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 06, 2021 | Mar. 26, 2021 | Dec. 13, 2019 | Jan. 22, 2018 | Nov. 01, 2016
Estimate of Fair Value Measurement | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  | $ 6,200,000 | $ 4,228,000 |  |  |  |  |  |  |  |  |  |
Estimate of Fair Value Measurement | Bluenica Corporation | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value | $ 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of Fair Value Measurement | FreshTemp | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000
Estimate of Fair Value Measurement | TempAlert | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Estimate of Fair Value Measurement | Accelerated Concepts | Contingent consideration on acquired business | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 |
Change in fair value of contingent consideration |  |  |  |  | 5,772,000 | (128,000) |  | $ 1,190,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 225,522,000 | 210,135,000 |  | 153,422,000 |  |  |  |  |  |  |  |
Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  | 6,200,000 | 4,228,000 |  | 5,407,000 |  |  |  |  |  |  |  |
Contingent consideration on acquired business | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value |  |  |  |  | 6,200,000 | 4,228,000 |  |  |  |  |  |  |  |  |  |
Bluenica Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Liability, Payout Period | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bluenica Corporation | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  | $ 2,900,000 |  | 2,200,000 |  | $ 0 | $ 500,000 |  |  |  |  |
FreshTemp | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |
TempAlert | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |
Accelerated Concepts | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  | $ 2,400,000 |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |  |
Opengear |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57,088,000 |  |
Opengear | Contingent consideration on acquired business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration |  |  | $ 10,000,000 | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |
Haxiot |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,605,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000 |  |  |
Ctek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 4,867,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability |  |  |  |  | $ 300,000 |  |  |  |  |  |  | $ 300,000 |  |  |  |

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