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Derivative Instruments and Hedging Activities (Details 2) (Instruments designated as accounting hedges:, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Sep. 30, 2013
Derivative instruments and hedging activities    
Asset derivatives: $ 14,016 $ 7,693
Liability derivatives: 14,643 7,726
Foreign currency forwards | Other current assets
   
Derivative instruments and hedging activities    
Asset derivatives: 8,223 1,597
Foreign currency forwards | Other noncurrent assets
   
Derivative instruments and hedging activities    
Asset derivatives: 5,629 4,957
Foreign currency forwards | Other current liabilities
   
Derivative instruments and hedging activities    
Liability derivatives: 8,811 2,360
Foreign currency forwards | Other noncurrent liabilities
   
Derivative instruments and hedging activities    
Liability derivatives: 5,832 5,366
Forward starting swap | Other noncurrent assets
   
Derivative instruments and hedging activities    
Asset derivatives: $ 164 $ 1,139