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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 07, 2021
Nov. 20, 2019
Class of Stock [Line Items]        
Stock repurchased during period (in shares) 101,481 103,830    
Stock repurchased during period, value $ 2.9 $ 3.2    
Shares retired 203,224 0    
Common Stock        
Class of Stock [Line Items]        
Number of shares authorized to be repurchased (in shares)     6,000,000 7,500,000
Stock repurchased and retired during the period (in shares) 2,833,755 3,669,597    
Remaining number of shares authorized to be repurchased (in shares) 7,315,876