v3.26.1
Business Segment Information (Narrative) (Details) - segment
3 Months Ended 6 Months Ended
Sep. 30, 2025
Mar. 31, 2026
Segment Reporting Information [Line Items]    
Number of reportable segments   3
Exploration and Production & Gathering Segments    
Segment Reporting Information [Line Items]    
Number of reportable segments 1