Derivative Financial Instruments (Details) bbl in Thousands, BTU in Billions	Oct. 28, 2021 BTU $ / Barrels $ / EnergyContent bbl	Sep. 30, 2021 BTU $ / Barrels $ / EnergyContent bbl
NYMEX Oil Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		5,052
Derivative, Swap Type, Weighted-Average Contract Price		41.70
NYMEX Oil Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		7,823
Derivative, Swap Type, Weighted-Average Contract Price		44.69
NYMEX Oil Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		1,190
Derivative, Swap Type, Weighted-Average Contract Price		45.20
NYMEX Oil Collar Contract, Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Weighted-Average Floor Price		0
Derivative, Weighted-Average Ceiling Price		0
NYMEX Oil Collar Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		2,342
Derivative, Weighted-Average Floor Price		54.00
Derivative, Weighted-Average Ceiling Price		61.39
NYMEX Oil Collar Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Weighted-Average Floor Price		0
Derivative, Weighted-Average Ceiling Price		0
NYMEX Oil Calendar Month Average Roll Differential Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		3,831
Derivative, Roll Differential Swap Type, Weighted-Average Contract Price		(0.16)
NYMEX Oil Calendar Month Average Roll Differential Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		11,278
Derivative, Roll Differential Swap Type, Weighted-Average Contract Price		0.11
NYMEX Oil Calendar Month Average Roll Differential Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		1,832
Derivative, Roll Differential Swap Type, Weighted-Average Contract Price		0.39
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		3,824
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		0.71
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		9,500
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		1.15
WTI Midland NYMEX WTI [Member] | Oil Basis Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		0
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		920
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		(7.86)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		3,650
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		(7.78)
NYMEX WTI ICE Brent [Member] | Oil Basis Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		0
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		466
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		0.60
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		1,329
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		1.25
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Oil Basis Swap Type, Weighted-Average Contract Price		0
IF HSC [Member] | Gas Swaps Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		12,412
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.41
IF HSC [Member] | Gas Swaps Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		28,932
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.52
IF HSC [Member] | Gas Swaps Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		0
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		0
WAHA [Member] | Gas Swaps Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		7,627
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		1.82
WAHA [Member] | Gas Swaps Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		14,087
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		2.32
WAHA [Member] | Gas Swaps Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		0
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		0
IF Tenn TX Z0 | Gas Swaps Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		0
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		0
IF Tenn TX Z0 | Gas Swaps Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		513
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		3.22
IF Tenn TX Z0 | Gas Swaps Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		0
Derivative, Swap Type, Weighted-Average Contract Price | $ / EnergyContent		0
NYMEX HH | Gas Collar Contract, Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		0
Derivative, Weighted-Average Floor Price | $ / EnergyContent		0
Derivative, Weighted-Average Ceiling Price | $ / EnergyContent		0
NYMEX HH | Gas Collar Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		2,129
Derivative, Weighted-Average Floor Price | $ / EnergyContent		3.40
Derivative, Weighted-Average Ceiling Price | $ / EnergyContent		5.91
NYMEX HH | Gas Collar Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		0
Derivative, Weighted-Average Floor Price | $ / EnergyContent		0
Derivative, Weighted-Average Ceiling Price | $ / EnergyContent		0
IF Tenn TX Z0 NYMEX HH | Gas Basis Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		0
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price | $ / EnergyContent		0
IF Tenn TX Z0 NYMEX HH | Gas Basis Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		1,254
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price | $ / EnergyContent		0.04
IF Tenn TX Z0 NYMEX HH | Gas Basis Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		0
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price | $ / EnergyContent		0
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		917
Derivative, Swap Type, Weighted-Average Contract Price		24.58
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		580
Derivative, Swap Type, Weighted-Average Contract Price		29.71
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Swap Type, Weighted-Average Contract Price		0
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Collar Contract, Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Weighted-Average Floor Price		0
Derivative, Weighted-Average Ceiling Price		0
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Collar Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		770
Derivative, Weighted-Average Floor Price		25.78
Derivative, Weighted-Average Ceiling Price		31.60
OPIS Propane Mont Belvieu Non-TET [Member] | NGL Collar Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Weighted-Average Floor Price		0
Derivative, Weighted-Average Ceiling Price		0
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		36
Derivative, Swap Type, Weighted-Average Contract Price		30.87
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Swap Type, Weighted-Average Contract Price		0
OPIS Normal Butane Mont Belvieu Non-TET [Member] | NGL Swaps Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		0
Derivative, Swap Type, Weighted-Average Contract Price		0
IF WAHA [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		81.00%
GD WAHA [Member]
Derivative Financial Instruments
Index percent of natural gas fixed swaps		19.00%
Subsequent Event | NYMEX Oil Collar Contract Third Quarter, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	300
Derivative, Weighted-Average Floor Price	70.00
Derivative, Weighted-Average Ceiling Price	73.52
Subsequent Event | NYMEX Oil Collar Contract First Quarter, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	300
Derivative, Weighted-Average Floor Price	60.00
Derivative, Weighted-Average Ceiling Price	75.20
Subsequent Event | IF HSC [Member] | Gas Collar Contract, First Quarter, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	900
Derivative, Weighted-Average Floor Price | $ / EnergyContent	3.38
Derivative, Weighted-Average Ceiling Price | $ / EnergyContent	7.75