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Fair Value Measurements (Tables)
 3 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets and Financial Liabilities that are Measured at Fair Value on a Recurring Basis
The following table presents on a gross basis our derivative assets and liabilities including both current and noncurrent portions, that are measured at fair value on a recurring basis within the fair value hierarchy, as of December 31, 2015, September 30, 2015 and December 31, 2014:
 
Asset (Liability)
 
Level 1
 
Level 2
 
Level 3
 
Total
December 31, 2015:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
234

 
$
—

 
$
—

 
$
234

Interest rate contracts
$
—

 
$
572

 
$
—

 
$
572

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(4,986
)
 
$
(1,557
)
 
$
—

 
$
(6,543
)
Interest rate contracts
$
—

 
$
(4,380
)
 
$
—

 
$
(4,380
)
September 30, 2015:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
934

 
$
373

 
$
—

 
$
1,307

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(4,560
)
 
$
(1,388
)
 
$
—

 
$
(5,948
)
Interest rate contracts
$
—

 
$
(7,016
)
 
$
—

 
$
(7,016
)
December 31, 2014:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
—

 
$
177

 
$
—

 
$
177

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(7,355
)
 
$
(2,600
)
 
$
—

 
$
(9,955
)