Investments and Fair Value Measurements - Schedule of Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Jan. 31, 2026
Assets
Time Deposits	$ 1,400,000
Recurring
Assets
Total assets	1,720,914	$ 2,018,170
Recurring \| Deferred compensation investments
Assets
Other assets	15,529	12,710
Recurring \| Level 1
Assets
Total assets	925,599	1,419,772
Recurring \| Level 1 \| Deferred compensation investments
Assets
Other assets	15,529	12,710
Recurring \| Level 2
Assets
Total assets	795,315	598,398
Recurring \| Level 2 \| Deferred compensation investments
Assets
Other assets	0	0
Recurring \| Level 3
Assets
Total assets	0	0
Recurring \| Level 3 \| Deferred compensation investments
Assets
Other assets	0	0
Recurring \| Money market funds
Assets
Cash equivalents	910,070	1,407,062
Recurring \| Money market funds \| Level 1
Assets
Cash equivalents	910,070	1,407,062
Recurring \| Money market funds \| Level 2
Assets
Cash equivalents	0	0
Recurring \| Money market funds \| Level 3
Assets
Cash equivalents	0	0
Recurring \| U.S. Treasury securities
Assets
Cash equivalents	795,315	598,398
Recurring \| U.S. Treasury securities \| Level 1
Assets
Cash equivalents	0	0
Recurring \| U.S. Treasury securities \| Level 2
Assets
Cash equivalents	795,315	598,398
Recurring \| U.S. Treasury securities \| Level 3
Assets
Cash equivalents	$ 0	$ 0