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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION - Performance-based Restricted Stock Units, Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Share-based compensation        
Award vesting rights percentage   50.00%    
Acuity Data        
Share-based compensation        
Non-cash stock-based compensation expense   $ 4.9    
Business combination, contingent consideration, liability, expected costs $ 1.7 1.7    
Acuity Data | Accrued Liabilities        
Share-based compensation        
Business combination, contingent consideration, liability $ 1.5 $ 1.5    
Performance stock        
Share-based compensation        
Granted (in shares)       246,524
Restricted stock units | Operating Metrics Performance Plan        
Share-based compensation        
Award vesting rights percentage     50.00%  
Forfeited in period (in shares)     58,312  
Outstanding at the end of the period (in shares) 174,930 174,930    
Restricted stock units | Performance stock        
Share-based compensation        
Granted (in shares)   406,501 249,152 59,634
Aggregate fair value of restricted stock units granted     $ 12.6 $ 10.7
Forfeited in period (in shares)   146,709    
Outstanding at the end of the period (in shares) 709,589 709,589 584,468  
Vesting in period (in shares)   134,671    
The total fair value of performance-based restricted stock units   $ 3.0 $ 6.7 $ 8.4
Restricted stock units | Performance stock | Operating Metrics Performance Plan        
Share-based compensation        
Granted (in shares)     148,912  
Aggregate fair value of restricted stock units granted     $ 7.1  
Restricted stock units | Performance stock | Minimum | Operating Metrics Performance Plan        
Share-based compensation        
Award vesting rights percentage     0.00%  
Restricted stock units | Performance stock | Maximum | Operating Metrics Performance Plan        
Share-based compensation        
Award vesting rights percentage     200.00%  
Restricted stock units | ATS Performance Plan Vesting Total Shareholder Return        
Share-based compensation        
Granted (in shares)     36,425  
Aggregate fair value of restricted stock units granted     $ 1.7  
Restricted stock units | ATS Performance Plan Vesting Total Shareholder Return | Minimum        
Share-based compensation        
Award vesting rights percentage     0.00%  
Restricted stock units | ATS Performance Plan Vesting Total Shareholder Return | Maximum        
Share-based compensation        
Award vesting rights percentage     100.00%  
Restricted stock units | Performance Shares Vesting Total Shareholder Return        
Share-based compensation        
Granted (in shares)     63,815 73,950
Aggregate fair value of restricted stock units granted     $ 3.8 $ 4.2
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Minimum        
Share-based compensation        
Award vesting rights percentage     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%
Restricted stock units | 2021 Performance Shares That Will Vest Immediately        
Share-based compensation        
Hurdle achievement, percentage 63.00% 50.00%    
Forfeited in period (in shares) 22,948 71,666    
Outstanding at the end of the period (in shares) 13,477 13,477    
Restricted stock units | Performance Shares Vesting Under The Second Plan        
Share-based compensation        
Granted (in shares)       172,574
Aggregate fair value of restricted stock units granted       $ 6.5
Restricted stock units | Performance Shares Vesting Under The Second Plan | Minimum        
Share-based compensation        
Award vesting rights percentage       0.00%
Restricted stock units | Performance Shares Vesting Under The Second Plan | Maximum        
Share-based compensation        
Award vesting rights percentage       200.00%