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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2017
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, 2017 and 2016:
 
Asset (Liability)
 
Level 1
 
Level 2
 
Level 3
 
Total
September 30, 2017
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
1,735

 
$
72

 
$
—

 
$
1,807

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

 
$
(1,520
)
September 30, 2016
 
 
 
 
 
 
 
Derivative instruments:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
4,506

 
$
4

 
$
—

 
$
4,510

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

 
$
(557
)
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, 2017 and 2016, were as follows:
 
2017
 
2016
Carrying amount
$
755,000

 
$
675,000

Estimated fair value
$
791,378

 
$
770,781