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SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) - CHANGES IN THE STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Changes in the Standardized Measure of Discounted Future Net Cash Flows |  |
Beginning of year | $ 19,913 | $ 27,878
Sales of oil and natural gas produced, net of production costs | (7,547) | (8,942)
Net changes in prices and production costs, net of royalties and wellhead taxes | (12,201) | (11,913)
Extensions and discoveries | 1,725 | 10,767
Net change due to purchases and sales of minerals in place | (895) | 0
Changes in future development costs | 170 | (2,959)
Revisions of previous quantity estimates | 9,478 | 2,227
Net change in income taxes | 1,786 | 2,868
Accretion of discount | 3,359 | 905
Other - changes in the timing of future production and other | 76 | (1,202)
Other - net change in Canadian dollar translation rate | (14) | 284
Net change | (4,063) | (7,965)
End of year | $ 15,850 | $ 19,913

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