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EARNINGS PER COMMON SHARE - Shares of common stock underlying RSUs (Details) - shares
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2023
Aug. 31, 2023
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Common Share              
Number of underlying shares       251,300 241,076 251,300 241,076
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric       98,994 98,073 98,994 98,073
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric         37,513   37,513
Total       98,994 135,586 98,994 135,586
Common shares not included in calculation due applicable metric had not been met at measurement dates       152,306 105,490 152,306 105,490
July 1, 2022              
Earnings Per Common Share              
Number of underlying shares       85,250   85,250  
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric       23,839   23,839  
Total       23,839   23,839  
Common shares not included in calculation due applicable metric had not been met at measurement dates       61,411   61,411  
August 3, 2021              
Earnings Per Common Share              
Number of underlying shares       85,350 85,350 85,350 85,350
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric       35,344 20,210 35,344 20,210
Total       35,344 20,210 35,344 20,210
Common shares not included in calculation due applicable metric had not been met at measurement dates       50,006 65,140 50,006 65,140
August 3, 2020              
Earnings Per Common Share              
Number of underlying shares       80,700 80,700 80,700 80,700
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric       39,811 40,350 39,811 40,350
Total       39,811 40,350 39,811 40,350
Common shares not included in calculation due applicable metric had not been met at measurement dates       40,889 40,350 40,889 40,350
July 1, 2019              
Earnings Per Common Share              
Number of underlying shares         75,026   75,026
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric         37,513   37,513
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric         37,513   37,513
Total         75,026   75,026
Restricted stock units              
Earnings Per Common Share              
Number of shares vested 74,988         74,988 64,488
Number of shares forfeited 38         38 10,538
Restricted stock units | August 3, 2020              
Earnings Per Common Share              
Number of shares vested     74,988        
Number of shares forfeited     38        
Number of shares issued upon vesting   74,988