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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 2017
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 March 31, 2017, September 30, 2016 and March 31, 2016:
 
Asset (Liability)
 
Level 1
 
Level 2
 
Level 3
 
Total
March 31, 2017:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
2,157

 
$
—

 
$
—

 
$
2,157

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(133
)
 
$
(19
)
 
$
—

 
$
(152
)
September 30, 2016:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
4,506

 
$
4

 
$
—

 
$
4,510

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

 
$
(557
)
March 31, 2016:
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Commodity contracts
$
1,179

 
$
—

 
$
—

 
$
1,179

Liabilities:
 
 
 
 
 
 
 
Commodity contracts
$
(3,281
)
 
$
(387
)
 
$
—

 
$
(3,668
)
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, 2017, September 30, 2016 and March 31, 2016 were as follows:
 
March 31, 2017
 
September 30, 2016
 
March 31, 2016
Carrying amount
$
775,000

 
$
675,000

 
$
550,000

Estimated fair value
$
801,675

 
$
770,781

 
$
637,016