Investments and Fair Value Measurements - Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Oct. 31, 2024	Jan. 31, 2024
Assets
Short-term investments	$ 0	$ 99,591
Recurring
Assets
Total assets	3,952,847	3,155,634
Recurring \| Money market funds
Assets
Cash equivalents	1,460,037	2,360,173
Recurring \| U.S. Treasury securities
Assets
Cash equivalents	2,488,351	693,599
Short-term investments	0	99,591
Recurring \| Deferred compensation investments
Assets
Other assets	4,459	2,271
Level 1 \| Recurring
Assets
Total assets	1,464,496	2,362,444
Level 1 \| Recurring \| Money market funds
Assets
Cash equivalents	1,460,037	2,360,173
Level 1 \| Recurring \| U.S. Treasury securities
Assets
Cash equivalents	0	0
Short-term investments	0	0
Level 1 \| Recurring \| Deferred compensation investments
Assets
Other assets	4,459	2,271
Level 2 \| Recurring
Assets
Total assets	2,488,351	793,190
Level 2 \| Recurring \| Money market funds
Assets
Cash equivalents	0	0
Level 2 \| Recurring \| U.S. Treasury securities
Assets
Cash equivalents	2,488,351	693,599
Short-term investments	0	99,591
Level 2 \| Recurring \| Deferred compensation investments
Assets
Other assets	0	0
Level 3 \| Recurring
Assets
Total assets	0	0
Level 3 \| Recurring \| Money market funds
Assets
Cash equivalents	0	0
Level 3 \| Recurring \| U.S. Treasury securities
Assets
Cash equivalents	0	0
Short-term investments	0	0
Level 3 \| Recurring \| Deferred compensation investments
Assets
Other assets	$ 0	$ 0