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Fair Value Measurements (Details) - USD ($)		3 Months Ended	6 Months Ended			12 Months Ended
	Oct. 05, 2015	Dec. 31, 2018	Mar. 31, 2019	Mar. 31, 2018		Sep. 30, 2018	Sep. 30, 2017	Jan. 22, 2018	Dec. 31, 2017	Oct. 20, 2017	Nov. 01, 2016
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Payment for contingent consideration			$ 2,348,000	$ 0	[1]
Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration fair value		$ 10,147,000	8,527,000	$ 8,263,000		$ 10,065,000	$ 6,388,000		$ 5,981,000
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration fair value			0			0
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration fair value			0			0
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration fair value			$ 8,527,000			10,065,000
Bluenica Corporation
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Earn-out payment installment period	4 years
Bluenica Corporation | Minimum | Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs probability of payment			95.00%
Bluenica Corporation | Maximum | Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs probability of payment			100.00%
Bluenica Corporation | Contingent Consideration
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Payment for contingent consideration			$ 2,200,000
Bluenica Corporation | Contingent Consideration | Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Payment for Contingent Consideration Liability, Investing Activities						0	$ 500,000
FreshTemp | Contingent Consideration
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Payment for contingent consideration		$ 200,000
TempAlert | Maximum | Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs probability of payment			0.00%
Accelerated | Maximum | Fair Value, Inputs, Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs probability of payment			70.00%
Estimate of Fair Value Measurement | Contingent Consideration | Fair Value, Measurements, Recurring
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration fair value			$ 8,527,000			$ 10,065,000
Estimate of Fair Value Measurement | Bluenica Corporation | Contingent Consideration | Fair Value, Measurements, Recurring
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration fair value	$ 10,400,000		3,200,000
Estimate of Fair Value Measurement | FreshTemp | Contingent Consideration | 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 | Fair Value, Measurements, Recurring
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration fair value			0							$ 0
Estimate of Fair Value Measurement | Accelerated | Contingent Consideration | Fair Value, Measurements, Recurring
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Contingent consideration fair value			$ 5,400,000					$ 2,300,000
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.

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