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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2012
Fair Value Disclosures [Abstract]  
Financial assets and financial liabilities that are measured at fair value on a recurring basis
The following table presents our financial assets and financial liabilities that are measured at fair value on a recurring basis for each of the fair value hierarchy levels, including both current and noncurrent portions, as of September 30, 2012 and 2011:
 
Quoted
Prices in
Active
Markets for
Identical
Assets and
Liabilities
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Unobservable
Inputs
(Level 3)
 
Total
September 30, 2012
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments
 
 
 
 
 
 
 
Commodity contracts
$
5,468

 
$
—

 
$
—

 
$
5,468

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments
 
 
 
 
 
 
 
Commodity contracts
$
671

 
$
8,766

 
$
—

 
$
9,437

Interest rate contracts
$
—

 
$
30,522

 
$
—

 
$
30,522

 
 
 
 
 
 
 
 
September 30, 2011
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments
 
 
 
 
 
 
 
Commodity contracts
$
27

 
$
41

 
$
—

 
$
68

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments
 
 
 
 
 
 
 
Commodity contracts
$
4,102

 
$
7,634

 
$
—

 
$
11,736

Interest rate contracts
$
—

 
$
18,585

 
$
—

 
$
18,585