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STOCK-BASED COMPENSATION: - Performance-based restricted stock units, narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Acuity Data      
Share-based compensation      
Non-cash stock-based compensation expense $ 3,400    
Business combination, contingent consideration, liability 1,712 $ 2,208  
Business combination, contingent consideration, liability, expected costs 1,700    
Acuity Data | Accrued Liabilities      
Share-based compensation      
Business combination, contingent consideration, liability $ 1,700    
Restricted stock units | Performance stock      
Share-based compensation      
Granted (in shares) 249,152    
Aggregate fair value of restricted stock units granted $ 12,600    
Forfeited in period (in shares) 138,072    
Outstanding at the end of the period (in shares) 650,835 631,869  
Vesting in period (in shares) 92,114    
The total fair value of performance-based restricted stock units $ 4,300    
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 $ 7,100    
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 $ 1,700    
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 $ 3,800    
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      
Vesting period 1 year    
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 Stock Subject To Compensation Committee Approval      
Share-based compensation      
Forfeited in period (in shares) 34,790    
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      
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 June 30, 2021      
Share-based compensation      
Award vesting rights percentage 67.00%    
Forfeited in period (in shares) 180,879    
Restricted stock units | Performance Shares Vesting Over Cumulative Performance Attainment Through September 30, 2021      
Share-based compensation      
Award vesting rights percentage 90.00%    
Restricted stock units | Performance Shares Vesting Over Two Periods the Second Quarter of Fiscal Year 2022      
Share-based compensation      
Forfeited in period (in shares) 243,199    
Restricted stock units | 2019 Performance Stock      
Share-based compensation      
Outstanding at the end of the period (in shares) 233,594