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Summary of Outstanding Forward Foreign Currency Contracts, by Currency (Detail)
In Thousands
Sep. 30, 2011
Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar
CAD
Sep. 30, 2011
Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar
USD ($)
Sep. 30, 2010
Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar
CAD
Sep. 30, 2010
Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar
USD ($)
Sep. 30, 2011
Foreign Exchange Contracts To Sell European Euro for US Dollar
EUR (€)
Sep. 30, 2011
Foreign Exchange Contracts To Sell European Euro for US Dollar
USD ($)
Sep. 30, 2010
Foreign Exchange Contracts To Sell European Euro for US Dollar
EUR (€)
Sep. 30, 2010
Foreign Exchange Contracts To Sell European Euro for US Dollar
USD ($)
Sep. 30, 2011
Foreign Exchange Contracts To Purchase British Pounds With US Dollars
USD ($)
Sep. 30, 2011
Foreign Exchange Contracts To Purchase British Pounds With US Dollars
GBP (£)
Sep. 30, 2010
Foreign Exchange Contracts To Purchase British Pounds With US Dollars
GBP (£)
Sep. 30, 2010
Foreign Exchange Contracts To Purchase British Pounds With US Dollars
USD ($)
Derivative [Line Items]            
Contract amount of forward foreign currency contracts to sell foreign currency 8,000$ 7,663 1,300$ 1,258€ 4,830$ 6,524€ 5,460$ 7,446    
Contract amount of forward foreign currency contracts to buy foreign currency        6,1003,9113,6725,800
Fair value of forward foreign currency contracts to sell foreign currency            
Fair value of forward foreign currency contracts to buy foreign currency