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STOCK-BASED COMPENSATION: Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Share-based compensation |  |  |  |  |
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) | 37,900,000 | 42,400,000 |  |  |
Number of available shares | 4,500,000 |  |  |  |
Vesting period |  | 1 year |  |  |
Other accrued expenses |  | $ 40,667 |  | $ 46,067 |
Award vesting rights percentage |  | 50.00% |  |  |
Award vesting percentage after one year |  | 50.00% |  |  |
Performance Based Stock Units |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 406,501 |  |  |
Aggregate fair value of restricted stock units granted |  | $ 10,000 |  |  |
Acuity Data |  |  |  |  |
Share-based compensation |  |  |  |  |
Non-cash stock-based compensation expense |  | 4,700 |  |  |
Business combination, contingent consideration, liability, expected costs |  | 1,700 |  |  |
Acuity Data | Accrued Liabilities |  |  |  |  |
Share-based compensation |  |  |  |  |
Business combination, contingent consideration, liability |  | 1,300 |  |  |
Restricted Stock | Diablo.AI, Inc. |  |  |  |  |
Share-based compensation |  |  |  |  |
Vested in period, fair value |  | $ 100 |  |  |
Outstanding at the end of the period (in shares) |  | 19,488 |  | 24,766 |
Restricted stock units |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation expense |  | $ 43,420 | $ 21,634 |  |
Restricted stock units | Vesting in four years |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 3,931,947 |  |  |
Aggregate fair value of restricted stock units granted |  | $ 97,800 |  |  |
Vesting period |  | 3 years |  |  |
Restricted stock units | Time Based Vesting |  |  |  |  |
Share-based compensation |  |  |  |  |
Vested in period, fair value |  | $ 21,700 |  |  |
Granted (in shares) |  | 3,931,947 |  |  |
Forfeited in period (in shares) |  | 597,584 |  |  |
Outstanding at the end of the period (in shares) |  | 6,624,312 |  | 4,176,682 |
Restricted stock units | Performance Based Stock Units |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 121,951 |  |  |
Aggregate fair value of restricted stock units granted |  | $ 3,700 |  |  |
Restricted stock units | Performance Based Stock Units | Minimum |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  | 0.00% |  |  |
Restricted stock units | Performance Based Stock Units | Maximum |  |  |  |  |
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 |  |  |  |
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) |  |  |  | 49,977 |
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 | Performance stock |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 406,501 |  |  | 59,634
Forfeited in period (in shares) |  | 138,050 |  |  |
Outstanding at the end of the period (in shares) |  | 766,502 |  | 584,468 |
The total fair value of performance-based restricted stock units |  | $ 2,000 |  |  |
Restricted stock units | Contingent Equity Awards |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 338,101 |  |  |
Restricted stock units | Performance Based Stock Units Under Operating Metrics |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 284,550 |  |  |
Aggregate fair value of restricted stock units granted |  | $ 6,300 |  |  |
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 | 2021 Performance Shares That Will Vest Immediately |  |  |  |  |
Share-based compensation |  |  |  |  |
Forfeited in period (in shares) |  | 71,666 |  |  |
Outstanding at the end of the period (in shares) |  | 208,746 |  |  |
Hurdle achievement, percentage |  | 50.00% |  |  |
Restricted stock units | 2021 Performance Shares That Will Vest In One Year |  |  |  |  |
Share-based compensation |  |  |  |  |
Vesting period |  | 1 year |  |  |
Restricted stock units | Diablo.AI, Inc. |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation expense |  | $ 249 | $ 524 |  |
Performance stock | Contingent Equity Awards |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 284,550 |  |  |
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) | 39,100,000 | 43,600,000 |  |  |
Shares which remained available for future grants (in shares) |  | 3,700,000 |  |  |
Operating Metrics Performance Plan | Restricted stock units |  |  |  |  |
Share-based compensation |  |  |  |  |
Vesting period |  | 1 year |  |  |
Forfeited in period (in shares) |  | 58,312 |  |  |
Outstanding at the end of the period (in shares) |  | 174,930 |  |  |
Award vesting rights percentage |  | 50.00% |  |  |
Operating Metrics Performance Plan Units That Will Vest Immediately | Restricted stock units |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  | 50.00% |  |  |
Operating Metrics Performance Plan Units That Will Vest In One Year | Restricted stock units |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  | 50.00% |  |  |
2021 Performance Shares That Will Vest Immediately | Restricted stock units |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  | 50.00% |  |  |
2021 Performance Shares That Will Vest In One Year | Restricted stock units |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  | 50.00% |  |  |
2019 Operating Metrics Performance Plan | Restricted stock units |  |  |  |  |
Share-based compensation |  |  |  |  |
Forfeited in period (in shares) |  | 243,378 |  |  |
Award vesting rights percentage |  | 96.00% |  |  |

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