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STOCK-BASED COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
plan
$ / shares
shares
Jun. 30, 2024
shares
Sep. 30, 2024
USD ($)
plan
$ / shares
shares
Sep. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
shares
Mar. 31, 2023
shares
Share-based compensation            
Number of performance plans | plan 2   2      
Future expense for performance stock option units $ 158,702   $ 158,702      
Performance stock            
Share-based compensation            
Aggregate fair value of restricted stock units granted     15,500      
Performance-Based Restricted Stock Units Under The Total Shareholder Return Performance Plan            
Share-based compensation            
Aggregate fair value of restricted stock units granted     5,600      
Habu            
Share-based compensation            
Non-cash stock-based compensation expense     3,300      
Business combination, contingent consideration, liability 3,300   3,300      
Business combination, contingent consideration, liability, expected costs $ 4,900   4,900      
Restricted Stock            
Share-based compensation            
Vested in period, fair value     $ 500      
Restricted Stock | Habu            
Share-based compensation            
Conversion of convertible securities (in shares) | shares         36,118  
Conversion of convertible securities         $ 1,400  
Pre-combination service         100  
Total fair value of the replacement stock options issued         $ 1,300  
Employee stock purchase plan            
Share-based compensation            
Stock issued during period, ESPP (in shares) | shares     104,574      
Shares issued, price per share (in dollars per share) | $ / shares $ 26.60   $ 26.60      
Stock issued during period, ESPP, value     $ 2,800      
Share-based compensation expense     871 $ 784    
Future expense for performance stock option units $ 300   $ 300      
Restricted stock units | Vesting in Four Years            
Share-based compensation            
Granted (in shares) | shares     1,801,372      
Aggregate fair value of restricted stock units granted     $ 57,800      
Restricted stock units | Time-Based Vesting Over Three Years            
Share-based compensation            
Vesting period     3 years      
Restricted stock units | Time Based Vesting            
Share-based compensation            
Vested in period, fair value     $ 46,200      
Granted (in shares) | shares     1,801,372      
Restricted stock units | Performance stock            
Share-based compensation            
Granted (in shares) | shares 429,857   429,857   199,946 101,931
The total fair value of performance-based restricted stock units     $ 1,000      
Restricted stock units | Performance-Based Restricted Stock Units Under The Total Shareholder Return Performance Plan            
Share-based compensation            
Granted (in shares) | shares     128,953   466,550  
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Minimum            
Share-based compensation            
Award vesting rights percentage     0.00%   0.00% 0.00%
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Maximum            
Share-based compensation            
Award vesting rights percentage     200.00%   200.00% 200.00%
Restricted stock units | Performance Based Stock Units Under Operating Metrics            
Share-based compensation            
Granted (in shares) | shares           237,837
Restricted stock units | Performance Based Stock Units Under Operating Metrics | Minimum            
Share-based compensation            
Award vesting rights percentage           0.00%
Restricted stock units | Performance Based Stock Units Under Operating Metrics | Maximum            
Share-based compensation            
Award vesting rights percentage           200.00%
Restricted stock units | Habu            
Share-based compensation            
Share-based compensation expense     $ 429 $ 0    
Stock Option and Equity Compensation Plans            
Share-based compensation            
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) | shares 51,500,000   51,500,000   49,000,000.0  
Shares which remained available for future grants (in shares) | shares 6,700,000   6,700,000      
Amended and Restated 2005 Equity Compensation Plan            
Share-based compensation            
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) | shares 48,900,000   48,900,000   46,400,000  
Number of available shares (in shares) | shares   2,500,000        
Operating Metrics Performance Plan | Restricted stock units | Performance stock            
Share-based compensation            
Granted (in shares) | shares     300,904      
Aggregate fair value of restricted stock units granted     $ 9,900      
Operating Metrics Performance Plan | Restricted stock units | Performance Shares Vesting Total Shareholder Return | Minimum            
Share-based compensation            
Award vesting rights percentage     0.00%   0.00%  
Operating Metrics Performance Plan | Restricted stock units | Performance Shares Vesting Total Shareholder Return | Maximum            
Share-based compensation            
Award vesting rights percentage     200.00%   200.00%