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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Sep. 30, 2011
Assets    
Foreign currency forward contracts $ 10  
Liabilities    
Foreign currency forward contracts     
Recurring basis [Member]
   
Assets    
Cash equivalents 45,768 65,792
Foreign currency forward contracts 10  
Total 45,778 65,792
Liabilities    
Foreign currency forward contracts      
Total      
Recurring basis [Member] | Level 1 [Member]
   
Assets    
Cash equivalents 45,768 65,792
Total 45,768 65,792
Liabilities    
Foreign currency forward contracts      
Total      
Recurring basis [Member] | Level 2 [Member]
   
Assets    
Cash equivalents      
Foreign currency forward contracts 10  
Total 10   
Liabilities    
Foreign currency forward contracts      
Total      
Recurring basis [Member] | Level 3 [Member]
   
Assets    
Cash equivalents      
Total      
Liabilities    
Foreign currency forward contracts      
Total