Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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-Publisher FASB
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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