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STOCK-BASED COMPENSATION - Schedule of the Status of Performance Share Units (Details) - $ / shares
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Performance Share Units      
Shares      
Outstanding (in shares) 726,000 699,000 337,000
Granted (in shares) 144,000 227,000 313,000
Vested (in shares) (286,000) (161,000) 0
Dividend equivalent right performance units credited (in shares) 212,000 15,000 60,000
Forfeited (in shares) 0 (54,000) (11,000)
Outstanding (in shares) 796,000 726,000 699,000
Weighted-Average Grant Date Fair Value per Share      
Outstanding (in dollars per share) $ 33.67 $ 41.55 $ 51.09
Granted (in dollars per share) 54.30 30.12 29.77
Vested (in dollars per share) 43.40 62.66 0
Dividend equivalent right performance units credited (in dollars per share) 35.94 32.82 49.64
Forfeited (in dollars per share) 0 34.16 43.40
Outstanding (in dollars per share) $ 34.51 $ 33.67 $ 41.55
Shares where performance criteria has been achieved (in shares) 233,322    
Vested and expected to vest (in shares) 412,046    
Vesting period 3 years    
Performance Share Units | Minimum      
Weighted-Average Grant Date Fair Value per Share      
Vesting of units (in percent) 0.00%    
Performance Share Units | Maximum      
Weighted-Average Grant Date Fair Value per Share      
Vesting of units (in percent) 20000.00%    
Phantom Share Units (PSUs)      
Shares      
Granted (in shares) 12,591,000 14,199,000 18,906,000
Vested (in shares) (14,199,000) (18,906,000) (20,616,000)
Weighted-Average Grant Date Fair Value per Share      
Vesting period 1 year