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EMPLOYEE BENEFIT PLANS - Activity in Equity Classified Share Awards (Details) - 2006 Incentive Plan - Restricted Stock - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Shares        
Beginning balance (in shares) 2,854,893 3,539,047 3,763,984  
Granted (in shares)   1,044,741 1,368,079 1,069,436
Vested (in shares)   (1,770,294) (1,496,643) (76,702)
Forfeited (in shares)     (96,373) (83,643)
Shares repurchased/forfeited (in shares)   (68,889)    
Ending balance (in shares)   2,744,605 3,539,047 3,763,984
Weighted average grant date fair value        
Beginning balance (in usd per share) $ 26.39 $ 39.13 $ 32.29  
Granted (in usd per share)   60.60 47.04 $ 49.32
Vested (in usd per share)   32.36 29.30 48.78
Forfeited (in usd per share)   50.87 38.63 33.91
Ending balance (in usd per share)   $ 51.37 $ 39.13 $ 32.29