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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Assets    
Cash equivalents $ 45,888 $ 65,792
Total 45,888 65,792
Liabilities    
Foreign currency forward contracts      
Liabilities, Fair Value Disclosure, Total      
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
   
Assets    
Cash equivalents 45,888 65,792
Total 45,888 65,792
Liabilities    
Foreign currency forward contracts      
Liabilities, Fair Value Disclosure, Total      
Significant Other Observable Inputs (Level 2) [Member]
   
Assets    
Cash equivalents      
Total      
Liabilities    
Foreign currency forward contracts      
Liabilities, Fair Value Disclosure, Total      
Significant Unobservable Inputs (Level 3) [Member]
   
Assets    
Cash equivalents      
Total      
Liabilities    
Foreign currency forward contracts      
Liabilities, Fair Value Disclosure, Total