Commitments and Contingencies - Purchase Commitments (Details) gal in Thousands, bbl in Thousands, $ in Thousands	Sep. 30, 2025 USD ($) gal bbl
Crude oil | Fixed-Price
Purchase commitments for crude oil and natural gas
Purchase obligation, remainder of fiscal year	$ 53,402
Purchase obligation, year one	0
Purchase obligation, year two	0
Purchase obligation	$ 53,402
Purchase obligation, volume, remainder of fiscal year | bbl	854
Purchase obligation, volume, year one | bbl	0
Purchase obligation, volume, year two | bbl	0
Purchase obligation, volume | bbl	854
Crude oil | Index-Price
Purchase commitments for crude oil and natural gas
Purchase obligation, remainder of fiscal year	$ 1,179,505
Purchase obligation, year one	198,053
Purchase obligation, year two	198,809
Purchase obligation, year three	30,540
Purchase obligation, year four	30,942
Purchase obligation, year five	33,243
Purchase obligation, after year five	122,150
Purchase obligation	$ 1,793,242
Purchase obligation, volume, remainder of fiscal year | bbl	20,371
Purchase obligation, volume, year one | bbl	4,687
Purchase obligation, volume, year two | bbl	4,680
Purchase obligation, volume, year three | bbl	1,820
Purchase obligation, volume, year four | bbl	1,820
Purchase obligation, volume, year five | bbl	557
Purchase obligation, volume, after year five | bbl	2,045
Purchase obligation, volume | bbl	35,980
Natural Gas Liquids (NGL) | Fixed-Price
Purchase commitments for crude oil and natural gas
Purchase obligation, remainder of fiscal year	$ 18,547
Purchase obligation, year one	4,075
Purchase obligation, year two	1,042
Purchase obligation	$ 23,664
Purchase obligation, volume, remainder of fiscal year | gal	24,453
Purchase obligation, volume, year one | gal	5,796
Purchase obligation, volume, year two | gal	1,512
Purchase obligation, volume | gal	31,761
Natural Gas Liquids (NGL) | Index-Price
Purchase commitments for crude oil and natural gas
Purchase obligation, remainder of fiscal year	$ 352,082
Purchase obligation, year one	9,008
Purchase obligation, year two	8,239
Purchase obligation, year three	0
Purchase obligation, year four	0
Purchase obligation, year five	0
Purchase obligation, after year five	0
Purchase obligation	$ 369,329
Purchase obligation, volume, remainder of fiscal year | gal	392,023
Purchase obligation, volume, year one | gal	9,960
Purchase obligation, volume, year two | gal	9,750
Purchase obligation, volume, year three | gal	0
Purchase obligation, volume, year four | gal	0
Purchase obligation, volume, year five | gal	0
Purchase obligation, volume, after year five | gal	0
Purchase obligation, volume | gal	411,733