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Basis of Presentation - Additional Information (Detail) (USD $)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Net gain on foreign currency transactions, which primarily related to recent acquisition $ 15,100,000us-gaap_ForeignCurrencyTransactionGainLossRealized $ 0us-gaap_ForeignCurrencyTransactionGainLossRealized