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STOCK-BASED COMPENSATION - Schedule of the Status of Performance Share Units (Details) - Performance Share Units - $ / shares
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Shares      
Outstanding (in shares) 603,000 796,000 726,000
Granted (in shares) 255,000 223,000 144,000
Vested (in shares) (290,000) (303,000) (286,000)
Dividend equivalent right performance units credited (in shares) 67,000 (106,000) 212,000
Forfeited (in shares) (58,000) (7,000) 0
Outstanding (in shares) 577,000 603,000 796,000
Weighted-Average Grant Date Fair Value per Share      
Outstanding (in dollars per share) $ 38.90 $ 34.51 $ 33.67
Granted (in dollars per share) 39.15 39.86 54.30
Vested (in dollars per share) 30.12 29.77 43.40
Dividend equivalent right performance units credited (in dollars per share) 31.89 34.09 35.94
Forfeited (in dollars per share) 43.26 38.67 0
Outstanding (in dollars per share) $ 41.51 $ 38.90 $ 34.51
Shares where performance criteria has been achieved (in shares) 57,043    
Vested and expected to vest (in shares) 35,831    
Minimum      
Weighted-Average Grant Date Fair Value per Share      
Vesting of units (in percent) 0.00%    
Maximum      
Weighted-Average Grant Date Fair Value per Share      
Vesting of units (in percent) 200.00%