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Company's Derivatives on Condensed Consolidated Financial statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivative Instruments Gain Loss [Line Items]        
Amount of (Loss) Gain Recognized in Income $ 657 $ 285 $ 812 $ 137
Foreign Currency Forward Contracts | Other Income (Expense)
       
Derivative Instruments Gain Loss [Line Items]        
Amount of (Loss) Gain Recognized in Income $ 657 $ 285 $ 812 $ 137