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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]    
Short-term forward contracts, average maturities at inception 3 months  
Foreign currency forward contracts    
Derivative [Line Items]    
Forward foreign currency contracts fair value $ 0 $ 0