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v3.19.1

Revenue - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |
Period of amortization | 3 years |  | 3 years |  |
Amortization | $ 0.2 | $ 0.1 | $ 0.4 | $ 0.1 |
Minimum |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Remaining performance obligation, period | 2 years |  | 2 years |  |
Maximum |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Remaining performance obligation, period | 5 years |  | 5 years |  |
Equipment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract assets | $ 2.3 |  | $ 2.3 |  | $ 2.1

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