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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate (as a percent) | 24.00% | 24.40% | 23.70% | 22.20% |
Long-term income tax receivable | $ 152,500 |  | $ 152,500 |  | $ 152,500
Tax Credit Carryforward [Line Items] |  |  |  |  |
Income tax reserves | 132,847 |  | 132,847 |  | 120,237
Research and Development Tax Credits |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Income tax reserves | $ 126,900 |  | $ 126,900 |  | $ 115,400

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