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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 |  |

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