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STOCKHOLDERS' EQUITY: - Time-vesting restricted stock unit, narrative (Details) - Restricted stock units - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Time Based Vesting |  |  |
Share-based compensation |  |  |
Granted (in shares) | 2,228,445 | 1,697,506 | 1,939,746
Aggregate fair value of restricted stock units granted | $ 99.8 | $ 85.6 |
Grants in period, total fair value |  |  | $ 69.5
Vested in period, fair value | $ 126.9 | $ 59.8 | $ 93.1
Time Based Vesting | DataFleets, Ltd |  |  |
Share-based compensation |  |  |
Granted (in shares) | 193,595 |  |
Aggregate fair value of restricted stock units granted | $ 13.5 |  |
Time Based Vesting | Data Plus Math Corporation |  |  |
Share-based compensation |  |  |
Granted (in shares) |  | 155,346 |
Aggregate fair value of restricted stock units granted |  | $ 7.3 |
Vesting in four years |  |  |
Share-based compensation |  |  |
Granted (in shares) |  |  | 1,856,444
Vesting period | 4 years | 4 years | 4 years
Time-Based Partial Cliff Vesting Tranche One |  |  |
Share-based compensation |  |  |
Granted (in shares) |  |  | 83,302
Vesting period |  |  | 1 year

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