Investments and Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Mar. 31, 2025
Assets, Fair Value Disclosure [Abstract]
Investments:	$ 153,180
Total financial assets	864,528	$ 831,681
Mutual funds
Assets, Fair Value Disclosure [Abstract]
Investments:	1,891	714
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Investments:	107,819	106,679
Corporate debt securities
Assets, Fair Value Disclosure [Abstract]
Investments:	26,106	22,514
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Investments:	4,807	6,183
U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
Investments:	14,448	11,747
Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	707,963	679,675
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:		1,577
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	500	1,596
U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	994	996
Level 1
Assets, Fair Value Disclosure [Abstract]
Total financial assets	709,854	680,389
Level 1 \| Mutual funds
Assets, Fair Value Disclosure [Abstract]
Investments:	1,891	714
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	0
Level 1 \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Investments:	0	0
Level 1 \| U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
Investments:	0	0
Level 1 \| Money market funds
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	707,963	679,675
Level 1 \| U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:		0
Level 1 \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	0	0
Level 1 \| U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	0	0
Level 2
Assets, Fair Value Disclosure [Abstract]
Total financial assets	154,674	151,292
Level 2 \| Mutual funds
Assets, Fair Value Disclosure [Abstract]
Investments:	0	0
Level 2 \| U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Investments:	107,819	106,679
Level 2 \| Corporate debt securities
Assets, Fair Value Disclosure [Abstract]
Investments:	26,106	22,514
Level 2 \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Investments:	4,807	6,183
Level 2 \| U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
Investments:	14,448	11,747
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:		1,577
Level 2 \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	500	1,596
Level 2 \| U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	994	996
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	0
Level 3 \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Investments:	0	0
Level 3 \| U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
Investments:	0	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
Level 3 \| Commercial paper
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	0	0
Level 3 \| U.S. government agency securities
Assets, Fair Value Disclosure [Abstract]
Cash equivalents:	$ 0	$ 0