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SHAREHOLDERS' EQUITY, Common Stock Dividends Declared and Paid (Details) - $ / shares
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Equity [Abstract]        
Dividends per common share - declared (in usd per share) $ 0.54 $ 0.50 $ 1.62 $ 1.50
Dividends per common share - paid (in usd per share) $ 0.54 $ 0.50 $ 1.58 $ 1.45
Dividend payout ratio 17.90% 23.60% 19.00% 20.40%