Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Oct. 31, 2025	Jan. 31, 2025
Assets:
Cash equivalents	$ 1,401,111	$ 2,251,140
Short-term investments	1,411,448	2,008,873
Long-term investments	1,041,474	656,476
Marketable equity securities	8,622	13,833
Non-marketable debt securities	10,000	750
Money market funds
Assets:
Cash equivalents	1,117,544	1,741,089
U.S. government securities
Assets:
Cash equivalents		388,670
Time deposits
Assets:
Cash equivalents	116,675	113,851
U.S. government and agency securities
Assets:
Cash equivalents	104,907
Commercial paper
Assets:
Cash equivalents	60,161	3,064
Corporate notes and bonds
Assets:
Cash equivalents	1,824	4,466
Recurring
Assets:
Marketable equity securities	8,622	13,833
Non-marketable debt securities	10,000	750
Derivative assets	4,542	1,579
Total assets	3,877,197	4,932,651
Liabilities:
Derivative liabilities	(1,692)	(1,639)
Total liabilities	(1,692)	(1,639)
Recurring | Corporate notes and bonds
Assets:
Short-term investments	976,480	1,059,181
Long-term investments	753,843	501,369
Recurring | U.S. government and agency securities
Assets:
Short-term investments	269,363	456,673
Long-term investments	287,631	153,065
Recurring | Certificates of deposit
Assets:
Short-term investments	87,568	185,163
Long-term investments		2,042
Recurring | Commercial paper
Assets:
Short-term investments	78,037	307,856
Recurring | Money market funds
Assets:
Cash equivalents	1,117,544	1,741,089
Recurring | U.S. government securities
Assets:
Cash equivalents		388,670
Recurring | Time deposits
Assets:
Cash equivalents	116,675	113,851
Recurring | U.S. government and agency securities
Assets:
Cash equivalents	104,907
Recurring | Commercial paper
Assets:
Cash equivalents	60,161	3,064
Recurring | Corporate notes and bonds
Assets:
Cash equivalents	1,824	4,466
Recurring | Level 1
Assets:
Marketable equity securities	8,622	13,833
Non-marketable debt securities	0	0
Derivative assets	0	0
Total assets	1,126,166	1,754,922
Liabilities:
Derivative liabilities	0	0
Total liabilities	0	0
Recurring | Level 1 | Corporate notes and bonds
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 1 | U.S. government and agency securities
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 1 | Certificates of deposit
Assets:
Short-term investments	0	0
Long-term investments		0
Recurring | Level 1 | Commercial paper
Assets:
Short-term investments	0	0
Recurring | Level 1 | Money market funds
Assets:
Cash equivalents	1,117,544	1,741,089
Recurring | Level 1 | U.S. government securities
Assets:
Cash equivalents		0
Recurring | Level 1 | Time deposits
Assets:
Cash equivalents	0	0
Recurring | Level 1 | U.S. government and agency securities
Assets:
Cash equivalents	0
Recurring | Level 1 | Commercial paper
Assets:
Cash equivalents	0	0
Recurring | Level 1 | Corporate notes and bonds
Assets:
Cash equivalents	0	0
Recurring | Level 2
Assets:
Marketable equity securities	0	0
Non-marketable debt securities	0	0
Derivative assets	4,542	1,579
Total assets	2,741,031	3,176,979
Liabilities:
Derivative liabilities	(1,692)	(1,639)
Total liabilities	(1,692)	(1,639)
Recurring | Level 2 | Corporate notes and bonds
Assets:
Short-term investments	976,480	1,059,181
Long-term investments	753,843	501,369
Recurring | Level 2 | U.S. government and agency securities
Assets:
Short-term investments	269,363	456,673
Long-term investments	287,631	153,065
Recurring | Level 2 | Certificates of deposit
Assets:
Short-term investments	87,568	185,163
Long-term investments		2,042
Recurring | Level 2 | Commercial paper
Assets:
Short-term investments	78,037	307,856
Recurring | Level 2 | Money market funds
Assets:
Cash equivalents	0	0
Recurring | Level 2 | U.S. government securities
Assets:
Cash equivalents		388,670
Recurring | Level 2 | Time deposits
Assets:
Cash equivalents	116,675	113,851
Recurring | Level 2 | U.S. government and agency securities
Assets:
Cash equivalents	104,907
Recurring | Level 2 | Commercial paper
Assets:
Cash equivalents	60,161	3,064
Recurring | Level 2 | Corporate notes and bonds
Assets:
Cash equivalents	1,824	4,466
Recurring | Level 3
Assets:
Marketable equity securities	0	0
Non-marketable debt securities	10,000	750
Derivative assets	0	0
Total assets	10,000	750
Liabilities:
Derivative liabilities	0	0
Total liabilities	0	0
Recurring | Level 3 | Corporate notes and bonds
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 3 | U.S. government and agency securities
Assets:
Short-term investments	0	0
Long-term investments	0	0
Recurring | Level 3 | Certificates of deposit
Assets:
Short-term investments	0	0
Long-term investments		0
Recurring | Level 3 | Commercial paper
Assets:
Short-term investments	0	0
Recurring | Level 3 | Money market funds
Assets:
Cash equivalents	0	0
Recurring | Level 3 | U.S. government securities
Assets:
Cash equivalents		0
Recurring | Level 3 | Time deposits
Assets:
Cash equivalents	0	0
Recurring | Level 3 | U.S. government and agency securities
Assets:
Cash equivalents	0
Recurring | Level 3 | Commercial paper
Assets:
Cash equivalents	0	0
Recurring | Level 3 | Corporate notes and bonds
Assets:
Cash equivalents	$ 0	$ 0