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STOCK-BASED COMPENSATION- Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) plan $ / shares shares | Jun. 30, 2023 shares | Dec. 31, 2023 USD ($) plan $ / shares shares | Dec. 31, 2022 USD ($) | Mar. 31, 2023 shares | Mar. 31, 2022 shares | Sep. 30, 2023 shares
Share-based compensation |  |  |  |  |  |  |
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) |  |  |  |  | 42,400,000 |  | 46,400,000
Number of available shares (in shares) |  | 4,000,000 |  |  |  |  |
Number of performance plans | plan | 2 |  | 2 |  |  |  |
Future expense for performance stock option units | $ | $ 136,351 |  | $ 136,351 |  |  |  |
Acuity Data |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Non-cash stock-based compensation expense | $ |  |  | 5,100 |  |  |  |
Business combination, contingent consideration, liability, expected costs | $ | 1,700 |  | 1,700 |  |  |  |
DataFleets, Ltd |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Holdback expenses | $ |  |  | $ 14,700 |  |  |  |
Holdback expenses, expected costs | $ | $ 2,600 |  |  |  |  |  |
Employee stock purchase plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Stock issued during period, ESPP (in shares) |  |  | 216,699 |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares | $ 19.76 |  | $ 19.76 |  |  |  |
Stock issued during period, ESPP, value | $ |  |  | $ 4,300 |  |  |  |
Share-based compensation expense | $ |  |  | 1,167 | $ 1,527 |  |  |
Future expense for performance stock option units | $ | $ 900 |  | $ 900 |  |  |  |
Restricted stock units | Vesting in Four Years |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  | 1,730,545 |  |  |  |
Aggregate fair value of restricted stock units granted | $ |  |  | $ 46,600 |  |  |  |
Restricted stock units | Time-Based Vesting Over Three Years |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  | 947,054 |  |  |  |
Vesting period |  |  | 3 years |  |  |  |
Restricted stock units | Time-Based Vesting Over Two Years |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  | 783,491 |  |  |  |
Vesting period |  |  | 2 years |  |  |  |
Restricted stock units | Time Based Vesting |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  | 1,730,545 |  |  |  |
Vested in period, fair value | $ |  |  | $ 28,000 |  |  |  |
Forfeited in period (in shares) |  |  | 378,510 |  |  |  |
Outstanding at the end of the period (in shares) | 4,471,115 |  | 4,471,115 |  | 4,009,759 |  |
Restricted stock units | Performance stock |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  | 666,496 |  | 101,931 |  |
Aggregate fair value of restricted stock units granted | $ |  |  | $ 21,000 |  |  |  |
Forfeited in period (in shares) |  |  | 214,760 |  |  |  |
Outstanding at the end of the period (in shares) | 1,105,357 |  | 1,105,357 |  | 709,589 |  |
The total fair value of performance-based restricted stock units | $ |  |  | $ 1,400 |  |  |  |
Restricted stock units | Performance-Based Restricted Stock Units Under The Total Shareholder Return Performance Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  | 199,946 |  |  |  |
Aggregate fair value of restricted stock units granted | $ |  |  | $ 8,400 |  |  |  |
Restricted stock units | Performance Shares Vesting Total Shareholder Return |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 41,298 |
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 Based Stock Units Under Operating Metrics |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 237,837 |  |
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 | ATS Performance Plan Vesting Total Shareholder Return |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 36,425 |
Restricted stock units | 2021 Performance Shares That Will Vest Immediately |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Hurdle achievement, percentage |  |  | 77.00% |  |  |  |
Forfeited in period (in shares) |  |  | 27,959 |  |  |  |
Outstanding at the end of the period (in shares) | 8,466 |  | 8,466 |  |  |  |
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) |  |  |  |  | 45,000,000 |  | 49,000,000
Stock Option and Equity Compensation Plans | Employee stock purchase plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Shares which remained available for future grants (in shares) | 6,800,000 |  | 6,800,000 |  |  |  |
Operating Metrics Performance Plan | Restricted stock units |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |
Award vesting rights percentage |  |  | 50.00% |  |  |  |
Forfeited in period (in shares) |  |  | 58,308 |  |  |  |
Outstanding at the end of the period (in shares) | 144,554 |  | 144,554 |  |  |  |
Operating Metrics Performance Plan | Restricted stock units | Performance stock |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  | 466,550 |  |  |  |
Aggregate fair value of restricted stock units granted | $ |  |  | $ 12,600 |  |  |  |
Operating Metrics Performance Plan | Restricted stock units | Performance Shares Vesting Total Shareholder Return | Minimum |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Award vesting rights percentage |  |  | 0.00% |  |  |  |
Operating Metrics Performance Plan | Restricted stock units | Performance Shares Vesting Total Shareholder Return | Maximum |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Award vesting rights percentage |  |  | 200.00% |  |  |  |
Qualified Employee Stock Purchase Plan | Employee stock purchase plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 1,200 |  |  |  |

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