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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities 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 described in Note 2, as of September 30, 2016 and 2015:
 
Asset (Liability)
 
Level 1
 
Level 2
 
Level 3
 
Total
September 30, 2016
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
4,506

 
$
4

 
$
—

 
$
4,510

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(263
)
 
$
(294
)
 
$
—

 
$
(557
)
September 30, 2015
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
934

 
$
373

 
$
—

 
$
1,307

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

 
$
(5,948
)
Interest rate contracts
$
—

 
$
(7,016
)
 
$
—

 
$
(7,016
)