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STOCK COMPENSATION - Nonvested Shares (Details) - $ / shares
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Number of Shares    
Nonvested shares outstanding, beginning of period (in shares) 1,005,813 913,578
Granted (in shares) 315,802 354,108
Vested (in shares) (391,061) (253,944)
Forfeited or expired (in shares) (4,432) (7,929)
Nonvested shares outstanding, end of period (in shares) 926,122 1,005,813
Weighted Average Fair Value At Grant    
Nonvested shares outstanding, beginning of period (in dollars per share) $ 29.89 $ 28.99
Granted (in dollars per share) 25.18 30.36
Vested (in dollars per share) 26.97 27.49
Forfeited or expired (in dollars per share) 25.98 23.27
Nonvested shares outstanding, end of period (in dollars per share) $ 29.54 $ 29.89