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STOCK-BASED COMPENSATION: - Performance-based restricted stock units, narrative (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Dec. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Acuity Data      
Share-based compensation      
Non-cash stock-based compensation expense $ 3.8    
Business combination, contingent consideration, liability, expected costs 1.7    
Acuity Data | Accrued Liabilities      
Share-based compensation      
Business combination, contingent consideration, liability $ 2.1    
Restricted stock units | Performance stock      
Share-based compensation      
Granted (in shares) 249,152    
Aggregate fair value of restricted stock units granted $ 12.6    
Forfeited in period (in shares) 138,774    
Outstanding at the end of the period (in shares) 607,079 631,869  
Vesting in period (in shares) 135,168    
The total fair value of performance-based restricted stock units $ 6.6    
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 59,634 54,012
Aggregate fair value of restricted stock units granted $ 3.8    
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 | 2022 Performance-Based Stock Units That Will Vest On The One Year Anniversary Of Attainment | Operating Metrics Performance Plan      
Share-based compensation      
Award vesting rights percentage 50.00%    
Vesting period 1 year    
Restricted stock units | 2021 Performance Stock      
Share-based compensation      
Hurdle achievement, percentage 50.00%    
Forfeited in period (in shares) 71,668    
Outstanding at the end of the period (in shares) 208,748    
Restricted stock units | 2021 Performance Shares That Will Vest Immediately      
Share-based compensation      
Award vesting rights percentage 50.00%    
Restricted stock units | 2021 Performance Shares That Will Vest In The Second Quarter Of Fiscal Year 2022      
Share-based compensation      
Award vesting rights percentage 50.00%    
Restricted stock units | 2022 Performance-Based Stock Units That Will Vest Immediately | Operating Metrics Performance Plan      
Share-based compensation      
Award vesting rights percentage 50.00%    
Restricted stock units | Performance Shares Vesting In Three Equal Annual Increments      
Share-based compensation      
Award vesting rights percentage 0.00%    
Vesting in period (in shares)     82,494
Restricted stock units | Vesting Based on Relevant Performance Period Over Two Periods at March 31 2022 | Minimum      
Share-based compensation      
Award vesting rights percentage     0.00%
Restricted stock units | Vesting Based on Relevant Performance Period Over Two Periods at March 31 2022 | Maximum      
Share-based compensation      
Award vesting rights percentage     200.00%
Restricted stock units | Performance Shares Vesting Over Two Periods Ending December 31, 2021      
Share-based compensation      
Award vesting rights percentage 90.00%    
Forfeited in period (in shares) 232,063    
Restricted stock units | Performance Shares Vesting Over Cumulative Performance Attainment Through December 31, 2021      
Share-based compensation      
Award vesting rights percentage 91.00%    
Restricted stock units | Performance Shares Vesting Over Two Periods the Second Quarter of Fiscal Year 2022      
Share-based compensation      
Forfeited in period (in shares) 233,153    
Restricted stock units | 2019 Performance Stock      
Share-based compensation      
Outstanding at the end of the period (in shares) 240,292