Derivative Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Foreign currency forward contracts	Sep. 30, 2013 Foreign currency forward contracts
Derivative [Line Items]
Short-term forward contracts, average maturities at inception	3 months
Forward foreign currency contracts fair value		$ 0	$ 0