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STOCK-BASED COMPENSATION - Summary of the Status of Performance Share Units and Changes in Performance Share Units Outstanding (Details) - Performance Share Units
 3 Months Ended
Dec. 31, 2021
$ / shares
shares
Performance Units  
Outstanding beginning balance (in shares) 699,000
Granted (in shares) 227,000
Dividend equivalent right performance units credited (in shares) 9,000
Outstanding ending balance (in shares) 935,000
Weighted Average Grant Date Fair Value per Share  
Outstanding beginning balance (in dollars per share) | $ / shares $ 41.55
Granted (in dollars per share) | $ / shares 30.12
Dividend equivalent right performance units credited (in dollars per share) | $ / shares 41.55
Outstanding ending balance (in dollars per share) | $ / shares $ 38.77
Vested (in shares) 291,786
Vested and expected to vest (in shares) 341,233