SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) - PROVED UNDEVELOPED RESERVES (Details) bbl in Thousands, Mcf in Thousands, Boe in Thousands	12 Months Ended
	Sep. 30, 2025 Boe Mcf bbl	Sep. 30, 2024 Boe Mcf bbl
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period | Boe	239	211
Conversion to proved developed reserves | Boe		(155)
Revisions of previous estimates | Boe	(239)	(56)
Additions due to a new well | Boe		239
Balance at the end of the period | Boe	0	239
Proved developed reserves - total, balance at the beginning of the period | Boe	2,184
Proved developed reserves - total, balance at the end of the period | Boe	1,380	2,184
Canada
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period | Boe	239	211
Conversion to proved developed reserves | Boe		(155)
Revisions of previous estimates | Boe	(239)	(56)
Additions due to a new well | Boe		239
Balance at the end of the period | Boe	0	239
Proved developed reserves - total, balance at the beginning of the period | Boe	1,676
Proved developed reserves - total, balance at the end of the period | Boe	1,380	1,676
United States
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period | Boe	0	0
Conversion to proved developed reserves | Boe		0
Revisions of previous estimates | Boe	0	0
Additions due to a new well | Boe		0
Balance at the end of the period | Boe	0	0
Proved developed reserves - total, balance at the beginning of the period | Boe	508
Proved developed reserves - total, balance at the end of the period | Boe	0	508
Oil
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period	109	92
Conversion to proved developed reserves		(98)
Revisions of previous estimates	(109)	6
Additions due to a new well		109
Balance at the end of the period	0	109
Proved developed reserves - volume, balance at the beginning of the period	873
Proved developed reserves - volume, balance at the end of the period	643	873
Oil | Canada
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period	109	92
Conversion to proved developed reserves		(98)
Revisions of previous estimates	(109)	6
Additions due to a new well		109
Balance at the end of the period	0	109
Proved developed reserves - volume, balance at the beginning of the period	783
Proved developed reserves - volume, balance at the end of the period	643	783
Oil | United States
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period	0	0
Conversion to proved developed reserves		0
Revisions of previous estimates	0	0
Additions due to a new well		0
Balance at the end of the period	0	0
Proved developed reserves - volume, balance at the beginning of the period	90
Proved developed reserves - volume, balance at the end of the period	0	90
Natural gas liquids
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period	23	18
Conversion to proved developed reserves		(10)
Revisions of previous estimates	(23)	(8)
Additions due to a new well		23
Balance at the end of the period	0	23
Proved developed reserves - volume, balance at the beginning of the period	340
Proved developed reserves - volume, balance at the end of the period	165	340
Natural gas liquids | Canada
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period	23	18
Conversion to proved developed reserves		(10)
Revisions of previous estimates	(23)	(8)
Additions due to a new well		23
Balance at the end of the period	0	23
Proved developed reserves - volume, balance at the beginning of the period	176
Proved developed reserves - volume, balance at the end of the period	165	176
Natural gas liquids | United States
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period	0	0
Conversion to proved developed reserves		0
Revisions of previous estimates	0	0
Additions due to a new well		0
Balance at the end of the period	0	0
Proved developed reserves - volume, balance at the beginning of the period	164
Proved developed reserves - volume, balance at the end of the period	0	164
Natural gas
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period | Mcf	640	608
Conversion to proved developed reserves | Mcf		(279)
Revisions of previous estimates | Mcf	(640)	(330)
Additions due to a new well | Mcf		641
Balance at the end of the period | Mcf	0	640
Proved developed reserves - volume, balance at the beginning of the period | Mcf	5,815
Proved developed reserves - volume, balance at the end of the period | Mcf	3,429	5,815
Natural gas | Canada
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period | Mcf	640	608
Conversion to proved developed reserves | Mcf		(279)
Revisions of previous estimates | Mcf	(640)	(330)
Additions due to a new well | Mcf		641
Balance at the end of the period | Mcf	0	640
Proved developed reserves - volume, balance at the beginning of the period | Mcf	4,301
Proved developed reserves - volume, balance at the end of the period | Mcf	3,429	4,301
Natural gas | United States
Changes in the estimates of net interests in total proved undeveloped reserves of oil, natural gas liquids and natural gas
Balance at the beginning of the period | Mcf	0	0
Conversion to proved developed reserves | Mcf		0
Revisions of previous estimates | Mcf	0	0
Additions due to a new well | Mcf		0
Balance at the end of the period | Mcf	0	0
Proved developed reserves - volume, balance at the beginning of the period | Mcf	1,514
Proved developed reserves - volume, balance at the end of the period | Mcf	0	1,514