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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION - Performance-based Restricted Stock Units, Narrative (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 shares | Mar. 31, 2024 USD ($) plan shares | Mar. 31, 2023 USD ($) plan shares | Mar. 31, 2022 USD ($) plan shares
Share-based compensation |  |  |  |
Number of performance plans | plan |  | 2 | 2 | 3
Performance Based Stock Units |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  |  | 406,501 |
Aggregate fair value of restricted stock units granted | $ |  |  | $ 10.0 |
Restricted stock units | Operating Metrics Performance Plan |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  |  |  | 58,312
Award vesting rights percentage |  | 59.00% |  |
Forfeited in period (in shares) |  | 39,211 |  |
Vesting in period (in shares) |  | 67,283 |  |
Outstanding at the end of the period (in shares) |  | 8,971 |  |
Restricted stock units | Performance stock |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  | 666,496 |  | 249,152
Aggregate fair value of restricted stock units granted | $ |  | $ 21.0 |  | $ 12.6
Forfeited in period (in shares) |  | 223,223 |  |
Vesting in period (in shares) |  | 57,114 |  |
Outstanding at the end of the period (in shares) |  | 1,095,748 | 709,589 |
The total fair value of performance-based restricted stock units | $ |  | $ 1.5 | $ 3.0 | $ 6.7
Restricted stock units | Performance stock | Operating Metrics Performance Plan |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  | 466,550 |  | 148,912
Aggregate fair value of restricted stock units granted | $ |  | $ 12.6 |  | $ 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 | 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 | $ |  | $ 8.4 |  |
Restricted stock units | Performance Based Stock Units |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  | 101,931 | 121,951 |
Aggregate fair value of restricted stock units granted | $ |  |  | $ 3.7 |
Restricted stock units | Performance Based Stock Units Under Operating Metrics |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  | 237,837 | 284,550 |
Aggregate fair value of restricted stock units granted | $ |  |  | $ 6.3 |
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
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 | 2022 Performance Shares That Will Vest Immediately |  |  |  |
Share-based compensation |  |  |  |
Award vesting rights percentage | 77.00% |  |  |
Forfeited in period (in shares) | 27,959 |  |  |
Restricted stock units | Performance Shares Vesting Total Shareholder Return |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  |  |  | 63,815
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%
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Minimum | Operating Metrics Performance Plan |  |  |  |
Share-based compensation |  |  |  |
Award vesting rights percentage |  | 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 Shares Vesting Total Shareholder Return | Maximum | Operating Metrics Performance Plan |  |  |  |
Share-based compensation |  |  |  |
Award vesting rights percentage |  | 200.00% |  |
Restricted stock units | 2021 Performance Shares That Will Vest In One Year |  |  |  |
Share-based compensation |  |  |  |
Granted (in shares) |  |  |  | 20,968
Award vesting rights percentage |  |  |  | 51.00%
Forfeited in period (in shares) |  |  |  | 20,330

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