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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based compensation        
Expected dividends 0.00% 0.00% 0.00%  
Share bonus awards        
Share-based compensation        
Granted (in shares) 10,982,109 8,259,272 8,257,502  
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 11.14 $ 11.87 $ 13.76 $ 14.39
Targeted number of awards as of March 31, 2021 (in shares) 17,308,625 16,050,640 14,903,886 14,619,692
Share bonus awards | $12.57        
Share-based compensation        
Granted (in shares) 9,400,000      
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 10.37      
Share bonus awards | Key Employees | $14.00        
Share-based compensation        
Granted (in shares) 1,600,000      
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 15.03      
Share Bonus Awards with Market Conditions        
Share-based compensation        
Expected dividends 0.00% 0.00% 0.00%  
Requisite service period 3 years 3 years 3 years  
Targeted number of awards as of March 31, 2021 (in shares) 3,398,312      
Equity instruments other than options, aggregate intrinsic value of instruments vested $ 68,600,000 $ 41,700,000 $ 80,200,000  
2017 Equity Incentive Plan        
Share-based compensation        
Shares available for grants (in shares) 24,800,000      
2017 Equity Incentive Plan | Options        
Share-based compensation        
Vesting period 4 years      
Expiration period of options issued 10 years      
Granted (in shares) 0 0 0  
2017 Equity Incentive Plan | Options | Non Employee Directors        
Share-based compensation        
Expiration period of options issued 5 years      
2017 Equity Incentive Plan | Share bonus awards        
Share-based compensation        
Cash consideration to acquire a specified number of ordinary shares in exchange for continued service $ 0      
Unrecognized compensation expense $ 124,100,000      
Share weighted-average remaining vesting period 1 year 10 months 24 days      
2017 Equity Incentive Plan | Share bonus awards | Minimum        
Share-based compensation        
Vesting period 3 years      
2017 Equity Incentive Plan | Share bonus awards | Maximum        
Share-based compensation        
Vesting period 4 years      
2017 Equity Incentive Plan | Share Bonus Awards with Market Conditions        
Share-based compensation        
Unrecognized compensation expense $ 23,200,000