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Gains Losses on Derivative Financial Instruments Recorded in Consolidated Statements of Income (Detail) (Foreign currency forward contracts, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Foreign currency forward contracts
       
Derivative [Line Items]        
Foreign currency forward contracts $ 194 $ (728) $ 532 $ (859)