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STOCK-BASED COMPENSATION - Fair Value of Stock-Based Awards Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Stock-based compensation      
Aggregate intrinsic value, options outstanding $ 66.3    
Proceeds from exercise of stock options 43.5    
Total grant date fair value of options vested $ 43.5    
Performance Based Awards      
Stock-based compensation      
Options granted in period (in dollars per shares) $ 125.03 $ 176.05 $ 176.42
Stock Options      
Stock-based compensation      
Contract term 10 years    
Aggregate intrinsic value, options outstanding $ 46.5 $ 0.0  
Stock Options | Minimum      
Stock-based compensation      
Award vesting period 4 years    
Stock Options | Maximum      
Stock-based compensation      
Award vesting period 5 years    
Stock Options | Share-Based Payment Arrangement, Tranche One      
Stock-based compensation      
Award vesting period 1 year    
Stock Options | Share-Based Payment Arrangement, Tranche One | Minimum      
Stock-based compensation      
Vesting percentage 20.00%    
Stock Options | Share-Based Payment Arrangement, Tranche One | Maximum      
Stock-based compensation      
Vesting percentage 25.00%    
Stock Options | Share-Based Payment Arrangement, Tranche Two | Minimum      
Stock-based compensation      
Award vesting period 26 months    
Stock Options | Share-Based Payment Arrangement, Tranche Two | Maximum      
Stock-based compensation      
Award vesting period 48 months    
Restricted Stock Units (RSUs)      
Stock-based compensation      
Unrecognized stock-based compensation expense $ 0.9    
Weighted-average recognition period 8 months 23 days    
ZMC | Performance Based Awards      
Stock-based compensation      
Options granted in period (in dollars per shares) $ 125.90 $ 182.66 120.00
Time Based      
Stock-based compensation      
Intrinsic value (in dollars per share) 118.17 180.97 171.58
Time Based | ZMC      
Stock-based compensation      
Intrinsic value (in dollars per share) 128.90 182.66 120.00
Employee Market-Based      
Stock-based compensation      
Options granted in period (in dollars per shares) 179.93 292.76 279.09
Market-based restricted shares | ZMC      
Stock-based compensation      
Options granted in period (in dollars per shares) $ 175.12 $ 293.32 $ 200.34