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Stock Plans - Employee Stock Purchase plan (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 31,463 | $ 24,602 | $ 84,270 | $ 71,941
Unrecognized stock-based compensation expense | $ 174,094 |  | $ 174,094 |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Purchase price as a percentage of fair market value |  |  | 85.00% |
Length of offering period (in months) |  |  | 6 months |
Maximum employee payroll percent deduction of salary | 10.00% |  | 10.00% |
Maximum amount of stock purchasable by employees within a calendar year |  |  | $ 25 |
Number of shares purchased by employees (in shares) |  |  | 68 | 96
Proceeds received |  |  | $ 5,486 | $ 5,164
Compensation expense |  |  | 2,746 | $ 2,391
Unrecognized stock-based compensation expense | $ 523 |  | $ 523 |

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