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Derivative Instruments and Hedging Activities (Details) (USD $)
In Thousands
Jun. 30, 2011
Sep. 30, 2010
Effects on Consolidated Balance Sheets    
Asset derivatives $ 18,715 $ 41,001
Liability derivatives 14,291 21,265
Designated as Hedging Instrument [Member] | Interest rate swap [Member]
   
Effects on Consolidated Balance Sheets    
Asset derivatives 6,444 8,609
Not Designated as Hedging Instrument [Member] | Forward Exchange Contract [Member]
   
Effects on Consolidated Balance Sheets    
Asset derivatives 12,271 32,392
Liability derivatives $ 14,291 $ 21,265