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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2013
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, 2013 and 2012:
 
Asset (Liability)
 
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, 2013
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments
 
 
 
 
 
 
 
Commodity contracts
$
43

 
$
—

 
$
—

 
$
43

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments
 
 
 
 
 
 
 
Commodity contracts
$
(2,162
)
 
$
(4,515
)
 
$
—

 
$
(6,677
)
 
 
 
 
 
 
 
 
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
)