Derivative Instruments - Notional Amounts, Crude Oil and Natural Gas (Details) bbl in Thousands, Mcf in Thousands	12 Months Ended
	Sep. 30, 2021 $ / MMBbls $ / MMBTU Mcf bbl
Oil Swap, Q4 2021
Derivative [Line Items]
Notional Volume | bbl	558,116
Weighted average price (in usd per bbl/mcf)	51.65
Oil Swap, Q1 2022
Derivative [Line Items]
Notional Volume | bbl	405,000
Weighted average price (in usd per bbl/mcf)	55.66
Oil Swap, Q2 2022
Derivative [Line Items]
Notional Volume | bbl	405,000
Weighted average price (in usd per bbl/mcf)	55.66
Oil Swap, Q3 2022
Derivative [Line Items]
Notional Volume | bbl	330,000
Weighted average price (in usd per bbl/mcf)	54.07
Oil Swap, Q4 2022
Derivative [Line Items]
Notional Volume | bbl	330,000
Weighted average price (in usd per bbl/mcf)	54.07
Oil Swap, 2023
Derivative [Line Items]
Notional Volume | bbl	360,000
Weighted average price (in usd per bbl/mcf)	59.01
Natural Gas Swaps, Q4 2021
Derivative [Line Items]
Notional Volume | Mcf	555,000
Weighted average price (in usd per bbl/mcf) | $ / MMBTU	3.03
Natural Gas Swaps, Q1 2022
Derivative [Line Items]
Notional Volume | Mcf	540,000
Weighted average price (in usd per bbl/mcf) | $ / MMBTU	3.26
Natural Gas Swaps, Q2 2022
Derivative [Line Items]
Notional Volume | Mcf	540,000
Weighted average price (in usd per bbl/mcf) | $ / MMBTU	3.26
Natural Gas Swaps, Q3 2022
Derivative [Line Items]
Notional Volume | Mcf	540,000
Weighted average price (in usd per bbl/mcf) | $ / MMBTU	3.26
Natural Gas Swaps, Q4 2022
Derivative [Line Items]
Notional Volume | Mcf	540,000
Weighted average price (in usd per bbl/mcf) | $ / MMBTU	3.26
Oil Collars, Q1 2022
Derivative [Line Items]
Notional Volume | bbl	90,000
Oil Collars, Q1 2022 | Short
Derivative [Line Items]
Weighted average price (in usd per bbl/mcf)	35.00
Oil Collars, Q1 2022 | Long
Derivative [Line Items]
Weighted average price (in usd per bbl/mcf)	42.63
Oil Collars, Q2 2022
Derivative [Line Items]
Notional Volume | bbl	90,000
Oil Collars, Q2 2022 | Short
Derivative [Line Items]
Weighted average price (in usd per bbl/mcf)	35.00
Oil Collars, Q2 2022 | Long
Derivative [Line Items]
Weighted average price (in usd per bbl/mcf)	42.63
Oil Collars, Q3 2022
Derivative [Line Items]
Notional Volume | bbl	90,000
Oil Collars, Q3 2022 | Short
Derivative [Line Items]
Weighted average price (in usd per bbl/mcf)	35.00
Oil Collars, Q3 2022 | Long
Derivative [Line Items]
Weighted average price (in usd per bbl/mcf)	42.63
Oil Collars, Q4 2022
Derivative [Line Items]
Notional Volume | bbl	90,000
Oil Collars, Q4 2022 | Short
Derivative [Line Items]
Weighted average price (in usd per bbl/mcf)	35.00
Oil Collars, Q4 2022 | Long
Derivative [Line Items]
Weighted average price (in usd per bbl/mcf)	42.63
Oil Basis, Q4 2021
Derivative [Line Items]
Notional Volume | bbl	435,000
Weighted average price (in usd per bbl/mcf)	0.40
Oil Basis, Q1 2022
Derivative [Line Items]
Notional Volume | bbl	180,000
Weighted average price (in usd per bbl/mcf)	0.40
Oil Basis, Q2 2022
Derivative [Line Items]
Notional Volume | bbl	180,000
Weighted average price (in usd per bbl/mcf)	0.40
Oil Basis, Q3 2022
Derivative [Line Items]
Notional Volume | bbl	180,000
Weighted average price (in usd per bbl/mcf)	0.40
Oil Basis, Q4 2022
Derivative [Line Items]
Notional Volume | bbl	180,000
Weighted average price (in usd per bbl/mcf)	0.40