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Fair Value Measurements (Tables)
 9 Months Ended
Jun. 30, 2016
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 June 30, 2016, September 30, 2015 and June 30, 2015:
 
Asset (Liability)
 
Level 1
 
Level 2
 
Level 3
 
Total
June 30, 2016:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
5,715

 
$
3

 
$
—

 
$
5,718

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(341
)
 
$
(391
)
 
$
—

 
$
(732
)
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
)
June 30, 2015:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
1,510

 
$
469

 
$
—

 
$
1,979

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(2,390
)
 
$
(2,605
)
 
$
—

 
$
(4,995
)