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Fair Value Measurements
9 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Note 9 — Fair Value Measurements

Derivative Instruments

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
)


The fair values of our Level 1 exchange-traded commodity futures and option derivative contracts are based upon actively-quoted market prices for identical assets and liabilities. The fair values of the remainder of our derivative financial instruments and electricity forward contracts, which are designated as Level 2, are generally based upon recent market transactions and related market indicators. There were no transfers between Level 1 and Level 2 during the periods presented.

Other Financial Instruments

The carrying amounts of other financial instruments included in current assets and current liabilities (except for current maturities of long-term debt) approximate their fair values because of their short-term nature. The carrying amount and estimated fair value of our long-term debt (including current maturities) at June 30, 2016, were $650,000 and $747,588, respectively. The carrying amount and estimated fair value of our long-term debt (including current maturities) at June 30, 2015, were $622,000 and $683,521, respectively. We estimate the fair value of long-term debt by using current market rates and by discounting future cash flows using rates available for similar types of debt (Level 2).