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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2018
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, 2018 and 2017:
 
Asset (Liability)
 
Level 1
 
Level 2
 
Level 3
 
Total
September 30, 2018
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
3,154

 
$
—

 
$
—

 
$
3,154

Interest rate contracts
$
—

 
$
30

 
$
—

 
$
30

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(146
)
 
$
—

 
$
—

 
$
(146
)
September 30, 2017
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
1,735

 
$
72

 
$
—

 
$
1,807

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(1,447
)
 
$
(73
)
 
$
—

 
$
(1,520
)
Schedule of Carrying Amount and Estimated Fair Value of Long-term Debt
The carrying amount and estimated fair value of our long-term debt (including current maturities but excluding unamortized debt issuance costs) at September 30, 2018 and 2017, were as follows:
 
2018
 
2017
Carrying amount
$
842,130

 
$
755,000

Estimated fair value
$
826,470

 
$
791,378