Investments and Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | $ 136,672 | $ 104,139 |
Total financial assets | 769,735 | 626,953 |
Mutual funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 249 | 102 |
U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 119,352 | 104,139 |
Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 6,828 | |
Corporate debt securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 8,991 | |
U.S. agency securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 1,500 | |
Money market funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 620,300 | 477,102 |
U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 8,545 | 45,610 |
Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 3,970 | |
Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total financial assets | 620,549 | 477,204 |
Level 1 | Mutual funds | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 249 | 102 |
Level 1 | U.S. treasury securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | 0 |
Level 1 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | |
Level 1 | Corporate debt securities | | |
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: | 620,300 | 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 | 149,186 | 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: | 119,352 | 104,139 |
Level 2 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 6,828 | |
Level 2 | Corporate debt securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 8,991 | |
Level 2 | U.S. agency securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 1,500 | |
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: | 8,545 | 45,610 |
Level 2 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash equivalents: | 3,970 | |
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 | Commercial paper | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investments: | 0 | |
Level 3 | Corporate debt securities | | |
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 | |