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STOCKHOLDERS' EQUITY: - Stock-based compensation activity, by award type (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Share-based compensation |  |  |
Total non-cash stock-based compensation | $ 111,707 | $ 89,447 | $ 102,722
Total non-cash stock-based compensation included in the consolidated statements of equity | 84,396 | 65,219 | 151,344
Stock options |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 2,308 | 3,675 | 3,291
Restricted stock units |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 78,164 | 55,543 | 67,015
Arbor Holdback Agreement | Arbor |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 0 | 2,553 | 15,316
Consideration Holdback | Data Plus Math Corporation |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 8,030 | 6,185 | 0
Consideration Holdback | DataFleets, Ltd |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 755 | 0 | 0
Pacific Data Partners, LLC Agreement Plan | Pacific Data Partners LLC |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 18,388 | 20,332 | 15,758
Acuity Performance Earnout | Acuity Data |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 2,208 | 0 | 0
Liability-based equity awards |  |  |
Share-based compensation |  |  |
Total non-cash stock-based compensation | (27,311) | (24,228) | (14,239)
Other stock-based compensation |  |  |
Share-based compensation |  |  |
Share-based compensation expense | $ 1,854 | $ 1,159 | $ 1,342

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