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SHAREHOLDERS' EQUITY - Summary of Restricted Shares Outstanding in Equity Incentive Plans (Details) - Restricted stock - shares
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Changes in number of shares outstanding      
Outstanding at beginning of the year (in shares) 689,375 666,775 672,875
Issued (in shares) 144,797 147,500 141,050
Cancelled (in shares) (400) 0 (16,850)
Vested (in shares) (127,925) (124,900) (130,300)
Outstanding at the end of the year (in shares) 705,847 689,375 666,775