SHAREHOLDERS' EQUITY, Common Stock Dividends Declared and Paid (Details) - $ / shares |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Equity [Abstract] | ||||
| Dividends per common share - declared (in usd per share) | $ 0.54 | $ 0.50 | $ 1.08 | $ 1.00 |
| Dividends per common share - paid (in usd per share) | $ 0.54 | $ 0.50 | $ 1.04 | $ 0.95 |
| Dividend payout ratio | 19.90% | 21.20% | 19.60% | 19.20% |