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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 2015
Fair Value Measurements [Abstract]  
Fair value of assets and liabilities measured on a recurring basis
The fair values of the Company's assets and liabilities measured on a recurring basis are categorized as follows:

  
March 31, 2015
  
September 30, 2014
 
  
Level 1
  
Level 2
  
Level 3
  
Total
  
Level 1
  
Level 2
  
Level 3
  
Total
 
Assets:
                
Derivatives (1)
 
$
-
   
-
   
-
  
$
-
  
$
-
  
$
2,457
   
-
  
$
2,457
 
Trading
   securities
 
$
19,538
   
-
   
-
  
$
19,538
  
$
19,038
   
-
   
-
  
$
19,038
 
Total assets at
   fair value
 
$
19,538
   
-
   
-
  
$
19,538
  
$
19,038
  
$
2,457
   
-
  
$
21,495
 
                                 
Liabilities:
                                
Derivatives (1)
 
$
-
  
$
2,862
   
-
  
$
2,862
  
$
-
  
$
2,127
   
-
  
$
2,127
 
Total liabilities
   at fair value
 
$
-
  
$
2,862
   
-
  
$
2,862
  
$
-
  
$
2,127
   
-
  
$
2,127
 
                                 
(1)Interest rate swaps are valued based on observable market swap rates.