Investments and Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024 |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | $ 146,006 | $ 104,139 |
Total financial assets | 765,135 | 626,953 |
Mutual funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 479 | 102 |
U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 109,976 | 104,139 |
Corporate debt securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 19,290 | |
Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 4,659 | |
U.S. agency securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 12,081 | |
Money market funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 616,004 | 477,102 |
U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 1,158 | 45,610 |
Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 1,488 | |
Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total financial assets | 616,483 | 477,204 |
Level 1 | Mutual funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 479 | 102 |
Level 1 | U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | 0 |
Level 1 | Corporate debt securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | |
Level 1 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | |
Level 1 | U.S. agency securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | |
Level 1 | Money market funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 616,004 | 477,102 |
Level 1 | U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 0 | 0 |
Level 1 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 0 | |
Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total financial assets | 148,652 | 149,749 |
Level 2 | Mutual funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | 0 |
Level 2 | U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 109,976 | 104,139 |
Level 2 | Corporate debt securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 19,290 | |
Level 2 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 4,659 | |
Level 2 | U.S. agency securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 12,081 | |
Level 2 | Money market funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 0 | 0 |
Level 2 | U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 1,158 | 45,610 |
Level 2 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 1,488 | |
Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total financial assets | 0 | 0 |
Level 3 | Mutual funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | 0 |
Level 3 | U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | 0 |
Level 3 | Corporate debt securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | |
Level 3 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | |
Level 3 | U.S. agency securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | |
Level 3 | Money market funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 0 | 0 |
Level 3 | U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 0 | $ 0 |
Level 3 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | $ 0 | |