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Fair Value Measurements (Tables)
 9 Months Ended
Jun. 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 June 30, 2013, September 30, 2012 and June 30, 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
June 30, 2013:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
103

 
$
—

 
$
—

 
$
103

Interest rate contracts
$
—

 
$
8,125

 
$
—

 
$
8,125

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
(1,885
)
 
$
(5,759
)
 
$
—

 
$
(7,644
)
Interest rate contracts
$
—

 
$
(15,306
)
 
$
—

 
$
(15,306
)
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
)
June 30, 2012:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
545

 
$
—

 
$
—

 
$
545

Liabilities:
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
 
Commodity contracts
$
(1,457
)
 
$
(12,099
)
 
$
—

 
$
(13,556
)
Interest rate contracts
$
—

 
$
(28,917
)
 
$
—

 
$
(28,917
)