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STOCK COMPENSATION - Additional Information (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period that options are issued 10 years    
Percentage of options vesting at either grant date or over four year period 100.00%    
Period that options vest 4 years    
Granted (in shares) 0 0 0
Exercised $ 0 $ 1,011,000 $ 1,800,000
Fair value of share granted (in shares) 190,187 191,372  
Award vesting period eight years    
Stock based compensation expense not yet recognized in income $ 5,500,000    
Weighted average remaining period for unrecognized stock based compensation 2 years 7 days    
Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of share granted (in shares) 1,000,000 800,000 1,000,000