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STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 06, 2018
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Oct. 02, 2023
Sep. 30, 2022
Jun. 15, 2021
Jan. 31, 2020
Mar. 07, 2018
Mar. 10, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unrecognized compensation expense related to outstanding stock options and RSUs   $ 22,700,000   $ 22,700,000              
Weighted average period for unrecognized compensation expense expected to be recognized (in years)       2 years 4 months 24 days              
Purchase of common stock (in shares)   652,419   652,419     781,092        
Recognized compensation expense   $ 2,644,000 $ 3,688,000 $ 7,790,000 $ 10,117,000            
Total intrinsic value of options exercised       $ 700,000 $ 300,000            
Options granted (in shares)       0 0            
Amount authorized and approved under share repurchase program               $ 15,000,000      
Amount of shares repurchased         $ 14,800,000            
Number of shares repurchased (in shares)         886,204            
Average price of shares repurchased (in dollars per share)         $ 16.73            
Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Discount rate from market price, purchase date       15.00%              
RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Weighted average period for unrecognized compensation expense expected to be recognized (in years)       2 years 7 months 6 days              
Awards outstanding (in shares)   2,127,351   2,127,351     2,441,677        
Recognized compensation expense   $ 1,900,000 2,500,000 $ 5,400,000 $ 7,100,000            
Unrecognized compensation expense related to nonvested awards   $ 17,500,000   $ 17,500,000              
Performance RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Weighted average period for unrecognized compensation expense expected to be recognized (in years)       1 year 10 months 24 days              
Awards outstanding (in shares)   979,562   979,562     919,456        
Recognized compensation expense   $ 600,000 900,000 $ 2,000,000 2,100,000            
Unrecognized compensation expense related to nonvested awards   5,000,000   5,000,000              
Stock options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Recognized compensation expense   29,000 100,000 100,000 400,000            
Unrecognized compensation expense of stock options   0   0              
Performance options | Chief Executive Officer                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of common stock reserved for future grants (in shares) 800,000                    
Recognized compensation expense   $ 0 0 $ 0 100,000            
Exercise price per share (in dollars per share) $ 9.50                    
2020 Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock reserved for issuance (in shares)                 4,500,000    
Number of common stock reserved for future grants (in shares)   1,193,194   1,193,194              
2020 Plan | Subsequent Event                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock reserved for issuance (in shares)           5,108,000          
2020 Plan | RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards outstanding (in shares)   2,503,543   2,503,543              
2020 Plan | Performance RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards outstanding (in shares)   808,446   808,446              
Prior Plans                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock reserved for issuance (in shares)                 107,903    
Purchase of common stock (in shares)   435,240   435,240              
Prior Plans | RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards outstanding (in shares)   102,900   102,900              
ESPP common stock equivalents                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock reserved for issuance (in shares)                   1,000,000  
Number of common stock reserved for future grants (in shares)   320,636   320,636              
Issuance of common stock under employee stock purchase plan (in shares)       679,364              
Recognized compensation expense   $ 100,000 $ 100,000 $ 200,000 $ 400,000            
ESPP common stock equivalents | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Discount rate from market price, offering date       15.00%              
Director Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock reserved for issuance (in shares)                     1,500,000
Number of common stock reserved for future grants (in shares)   0   0              
Director Plan | RSUs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Purchase of common stock (in shares)   259,513   259,513