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Derivative Financial Instruments and Fair Value Measurements (Details)
AUD in Millions, $ in Millions
12 Months Ended
Sep. 30, 2016
USD ($)
item
Sep. 30, 2015
AUD
item
Sep. 30, 2016
AUD
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Derivative financial instruments          
Number of contingent consideration arrangements | item 2 2      
Level 3          
Derivative financial instruments          
Fair value of contingent consideration liability       $ 39.0 $ 39.0
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap agreements          
Derivative financial instruments          
Losses Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion) $ 0.0        
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap June 2018          
Derivative financial instruments          
Notional Amount       $ 300.0 $ 300.0
Fixed Rate (as a percent)   1.63% 1.63% 1.63% 1.63%
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap September 2018          
Derivative financial instruments          
Notional Amount       $ 300.0 $ 300.0
Fixed Rate (as a percent)   1.54% 1.54% 1.54% 1.54%
Designated as Hedging Instrument | Cash Flow Hedging | AUD | Foreign currency forward contracts          
Derivative financial instruments          
Notional principal of derivative exchange contracts   AUD 98.1 AUD 58.6 $ 43.4 $ 74.1