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STOCK COMPENSATION - Performance Shares (Details) - $ / shares
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Number of Units    
Shares outstanding, beginning of period (in shares) 790,083 926,122
Granted (in shares) 190,187 191,372
Vested (in shares) (329,409) (316,283)
Forfeited or expired (in shares) (103,798) (11,128)
Shares outstanding, end of period (in shares) 547,063 790,083
Weighted Average Fair Value at Grant    
Shares outstanding, beginning of period (in dollars per share) $ 30.03 $ 29.54
Granted (in dollars per share) 30.88 32.32
Vested (in dollars per share) 30.32 29.92
Forfeited or expired (in dollars per share) 29.66 31.35
Shares outstanding, end of period (in dollars per share) $ 30.22 $ 30.03
PSUs    
Number of Units    
Shares outstanding, beginning of period (in shares) 0  
Granted (in shares) 60,984  
Vested (in shares) 0  
Forfeited or expired (in shares) 0  
Shares outstanding, end of period (in shares) 60,984 0
Weighted Average Fair Value at Grant    
Shares outstanding, beginning of period (in dollars per share) $ 0  
Granted (in dollars per share) 34.03  
Vested (in dollars per share) 0  
Forfeited or expired (in dollars per share) 0  
Shares outstanding, end of period (in dollars per share) $ 34.03 $ 0