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SHARE BASED COMPENSATION - Summary of Stock Options (Details) - $ / shares
shares in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Options      
Beginning balance (in shares) 220 230 240
Forfeited (in shares)     (10)
Exercised (in shares) (60) (10)  
Ending balance (in shares) 160 220 230
Weighted Average Exercise Price      
Beginning balance (in dollars per share) $ 73.96 $ 73.51 $ 73.29
Forfeited (in dollars per share)     67.83
Exercised (in dollars per share) 52.83 52.83  
Ending balance (in dollars per share) 82.36 73.96 73.51
Weighted Average
Grant Date Fair Value      
Beginning balance (in dollars per share) 4.82 4.79 4.78
Forfeited (in dollars per share)     4.94
Exercised (in dollars per share) 3.55 3.55  
Ending balance (in dollars per share) $ 5.32 $ 4.82 $ 4.79