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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities $ 2.0 $ 0.0
HedgePeriodStart Sep. 30, 2016  
Derivative, Maturity Date Sep. 30, 2021  
Derivative, Cap Interest Rate 0.75%  
Derivative, Fixed Interest Rate 2.341%  
Derivative, Notional Amount $ 150.0  
Other noncurrent liabilities 5.3 2.6
Derivative Liability $ 7.3 $ 2.6
Secured Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 4.54%  
Derivative, Amount of Hedged Item $ 150.0  
Cash Flow Hedging [Member] | Secured Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 5.591%