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Intangible Assets - Finite-Lived Intangible Assets Future Amortization Expense (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Amortization of Intangible Assets $ 2.1 $ 1.2  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
Fiscal 2016 (remaining nine months) 0.7    
Fiscal 2017 2.2    
Fiscal 2018 2.2    
Fiscal 2019 2.0    
Fiscal 2020 and thereafter 5.9    
Finite-Lived Intangible Assets, Net 13.0    
Trade Names [Member]      
Finite-Lived Trade Names, Gross 1.1   $ 1.1
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
Finite-Lived Intangible Assets, Net $ 0.1   $ 0.5