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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 2019
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:
 
Asset (Liability)
 
Level 1
 
Level 2
 
Level 3
 
Total
March 31, 2019:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
1,258

 
$
—

 
$
—

 
$
1,258

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(251
)
 
$
—

 
$
—

 
$
(251
)
Interest rate contracts
$
—

 
$
(2,528
)
 
$
—

 
$
(2,528
)
September 30, 2018:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
3,154

 
$
—

 
$
—

 
$
3,154

Interest rate contracts
$
—

 
$
30

 
$
—

 
$
30

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(146
)
 
$
—

 
$
—

 
$
(146
)
March 31, 2018:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
1,042

 
$
9

 
$
—

 
$
1,051

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(582
)
 
$
(7
)
 
$
—

 
$
(589
)
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 March 31, 2019, September 30, 2018 and March 31, 2018 were as follows:
 
March 31, 2019
 
September 30, 2018
 
March 31, 2018
Carrying amount
$
988,080

 
$
842,130

 
$
838,437

Estimated fair value
$
1,005,920

 
$
826,470

 
$
871,853