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STOCK-BASED COMPENSATION - Stock Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Employee Market-Based      
Weighted-average assumptions      
Risk-free interest rate 0.10% 0.20% 1.80%
Expected stock price volatility 37.30% 40.70% 39.40%
Expected service period (years) 1 year 6 months 1 year 6 months 1 year 6 months
Dividends $ 0 $ 0 $ 0
Non-Employee Market-Based      
Weighted-average assumptions      
Risk-free interest rate 0.20% 0.20% 2.40%
Expected stock price volatility 36.30% 40.80% 39.90%
Expected service period (years) 1 year 1 year 1 year
Dividends $ 0 $ 0 $ 0
Time-based      
Shares      
Non-vested restricted stock units at the beginning of the year (in shares) 2,064    
Granted (in shares) 560    
Vested (in shares) (720)    
Forfeited (in shares) (56)    
Non-vested restricted stock units at the end of the year (in shares) 1,848 2,064  
Weighted Average Fair Value on Grant Date      
Non-vested restricted stock at the beginning of the year (in dollars per share) $ 139.94    
Granted (in dollars per share) 180.87    
Vested (in dollars per share) 130.24    
Forfeited (in dollars per share) 158.98    
Non-vested restricted stock at the end of the year (in dollars per share) $ 155.36 $ 139.94  
Market-based restricted shares      
Shares      
Non-vested restricted stock units at the beginning of the year (in shares) 323    
Granted (in shares) 288    
Vested (in shares) (357)    
Forfeited (in shares) (2)    
Non-vested restricted stock units at the end of the year (in shares) 252 323  
Weighted Average Fair Value on Grant Date      
Non-vested restricted stock at the beginning of the year (in dollars per share) $ 187.21    
Granted (in dollars per share) 214.24    
Vested (in dollars per share) 150.96    
Forfeited (in dollars per share) 200.66    
Non-vested restricted stock at the end of the year (in dollars per share) $ 242.90 $ 187.21  
Performance Based Awards      
Shares      
Non-vested restricted stock units at the beginning of the year (in shares) 3,599    
Granted (in shares) 96    
Vested (in shares) (93)    
Forfeited (in shares) (39)    
Non-vested restricted stock units at the end of the year (in shares) 3,563 3,599  
Weighted Average Fair Value on Grant Date      
Non-vested restricted stock at the beginning of the year (in dollars per share) $ 150.06    
Granted (in dollars per share) 166.98    
Vested (in dollars per share) 136.42    
Forfeited (in dollars per share) 162.40    
Non-vested restricted stock at the end of the year (in dollars per share) $ 112.81 $ 150.06