Investments and Fair Value Measurements - Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jan. 31, 2025
Assets
Time Deposits	$ 707,000
Recurring
Assets
Total assets	3,342,869	$ 3,965,633
Recurring \| Money market funds
Assets
Cash equivalents	845,191	1,470,040
Recurring \| U.S. Treasury securities
Assets
Cash equivalents	2,489,080	2,490,097
Recurring \| Deferred compensation investments
Assets
Other assets	8,598	5,496
Recurring \| Level 1
Assets
Total assets	853,789	1,475,536
Recurring \| Level 1 \| Money market funds
Assets
Cash equivalents	845,191	1,470,040
Recurring \| Level 1 \| U.S. Treasury securities
Assets
Cash equivalents	0	0
Recurring \| Level 1 \| Deferred compensation investments
Assets
Other assets	8,598	5,496
Recurring \| Level 2
Assets
Total assets	2,489,080	2,490,097
Recurring \| Level 2 \| Money market funds
Assets
Cash equivalents	0	0
Recurring \| Level 2 \| U.S. Treasury securities
Assets
Cash equivalents	2,489,080	2,490,097
Recurring \| Level 2 \| Deferred compensation investments
Assets
Other assets	0	0
Recurring \| Level 3
Assets
Total assets	0	0
Recurring \| Level 3 \| Money market funds
Assets
Cash equivalents	0	0
Recurring \| Level 3 \| U.S. Treasury securities
Assets
Cash equivalents	0	0
Recurring \| Level 3 \| Deferred compensation investments
Assets
Other assets	$ 0	$ 0