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Derivative Financial Instruments and Fair Value Measurements (Details)
AUD in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Sep. 30, 2015
item
Mar. 31, 2017
AUD
Mar. 31, 2017
USD ($)
Sep. 30, 2016
AUD
Sep. 30, 2016
USD ($)
Derivative financial instruments            
Number of contingent consideration arrangements | item   1        
Payments       $ 21,000,000    
Level 3            
Derivative financial instruments            
Fair value of contingent consideration liability       13,000,000   $ 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 34.1 $ 25,500,000 AUD 58.6 $ 43,400,000