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Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2011
Fair Value Measurements [Abstract]  
Fair Value of Assets and Liabilities Measured on a Recurring Basis
As of June 30, 2011 and September 30, 2010, the fair values of the Company's assets and liabilities measured on a recurring basis are categorized as follows:

   
June 30, 2011
  
September 30, 2010
 
   
Level 1
  
Level 2
  
Level 3
  
Total
  
Level 1
  
Level 2
  
Level 3
  
Total
 
Assets:
                        
Short-term
  investments
 $1,392   -   -  $1,392  $1,395   -   -  $1,395 
Trading
  securities
  14,326   -   -   14,326   11,770   -   -   11,770 
Total assets at
  fair value
 $15,718   -   -  $15,718  $13,165   -   -  $13,165 
                                  
Liabilities:
                                
Derivatives (1)
  -  $4,577   -  $4,577   -  $4,445   -  $4,445 
Total liabilities
  at fair value
  -  $4,577   -  $4,577   -  $4,445   -  $4,445 
                                  
(1) Interest rate swaps are valued based on observable market swap rates.