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Derivative Financial Instruments and Fair Value Measurements (Details)
AUD in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Sep. 30, 2015
AUD
item
Sep. 30, 2014
item
Mar. 31, 2016
AUD
Mar. 31, 2016
USD ($)
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         $ 39,000,000 $ 39,000,000
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          
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap June 2018            
Derivative financial instruments            
Notional Amount         $ 300,000,000 $ 300,000,000
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         $ 300,000,000 $ 300,000,000
Fixed Rate (as a percent)   1.54%   1.54% 1.54% 1.54%
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency forward contracts            
Derivative financial instruments            
Notional principal of derivative exchange contracts   AUD 98.1   AUD 83.7 $ 62,300,000 $ 74,100,000