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STOCK-BASED COMPENSATION - Schedule of the Status of Performance Share Units (Details) - Performance Share Units
 6 Months Ended
Mar. 31, 2023
$ / shares
shares
Performance Units  
Outstanding (in shares) 726,000
Granted (in shares) 144,000
Vested (in shares) (286,000)
Dividend rights performance units credited (in shares) 191,000
Outstanding (in shares) 775,000
Weighted-Average Grant Date Fair Value per Unit  
Outstanding (in dollars per share) | $ / shares $ 33.67
Granted (in dollars per share) | $ / shares 54.30
Vested (in dollars per share) | $ / shares 43.40
Dividend rights performance units credited (in dollars per share) | $ / shares 36.10
Outstanding (in dollars per share) | $ / shares $ 34.51
Shares where performance criteria has been achieved (in shares) 225,308
Vested and expected to vest (in shares) 379,152
Minimum  
Weighted-Average Grant Date Fair Value per Unit  
Vesting of units (in percent) 0.00%
Maximum  
Weighted-Average Grant Date Fair Value per Unit  
Vesting of units (in percent) 200.00%