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Income Taxes - Reconciliation of Potential Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Reconciliation of the beginning and ending amount of potential tax benefits |  |  |
Beginning of year | $ 78,519 | $ 62,742 | $ 55,221
Increases in prior year position | 0 | 2,620 | 5,018
Increases in current year position | 470,881 | 13,530 | 12,753
Decreases in prior year position | (1,328) | (373) | 0
Settlements with taxing authorities | 0 | 0 | 0
Lapse of statute of limitations | (187) | 0 | (10,250)
End of year | $ 547,885 | $ 78,519 | $ 62,742

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