Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Purchase obligation	$ 16.0	$ 15.0
Minimum
Schedule of Equity Method Investments [Line Items]
Severance payment term	12 months
Maximum
Schedule of Equity Method Investments [Line Items]
Severance payment term	36 months