Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jan. 31, 2025
Assets:
Cash equivalents	$ 1,499,298	$ 2,251,140
Short-term investments	1,705,988	2,008,873
Long-term investments	1,012,904	656,476
Money market funds
Assets:
Cash equivalents	1,320,540	1,741,089
Time deposits
Assets:
Cash equivalents	115,074	113,851
Corporate notes and bonds
Assets:
Cash equivalents	10,834	4,466
U.S. government securities
Assets:
Cash equivalents	52,850	388,670
Commercial paper
Assets:
Cash equivalents		3,064
Recurring
Assets:
Marketable equity securities	8,385	13,833
Non-marketable debt securities	11,000	750
Derivative assets	7,255	1,579
Total assets	4,244,830	4,932,651
Liabilities:
Derivative liabilities	(1,458)	(1,639)
Total liabilities	(1,458)	(1,639)
Recurring | Corporate notes and bonds
Assets:
Short-term investments	1,079,287	1,059,181
Long-term investments	814,778	501,369
Recurring | U.S. government and agency securities
Assets:
Short-term investments	373,662	456,673
Long-term investments	198,126	153,065
Recurring | Commercial paper
Assets:
Short-term investments	135,091	307,856
Recurring | Certificates of deposit
Assets:
Short-term investments	117,948	185,163
Long-term investments		2,042
Recurring | Money market funds
Assets:
Cash equivalents	1,320,540	1,741,089
Recurring | Time deposits
Assets:
Cash equivalents	115,074	113,851
Recurring | Corporate notes and bonds
Assets:
Cash equivalents	10,834	4,466
Recurring | U.S. government securities
Assets:
Cash equivalents	52,850	388,670
Recurring | Commercial paper
Assets:
Cash equivalents		3,064
Recurring | Level 1
Assets:
Non-marketable debt securities	0	0
Derivative assets	0	0
Total assets	1,328,925	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 | Commercial paper
Assets:
Short-term investments	0	0
Recurring | Level 1 | Certificates of deposit
Assets:
Short-term investments	0	0
Long-term investments		0
Recurring | Level 1 | Money market funds
Assets:
Cash equivalents	1,320,540	1,741,089
Recurring | Level 1 | Time deposits
Assets:
Cash equivalents	0	0
Recurring | Level 1 | Corporate notes and bonds
Assets:
Cash equivalents	0	0
Recurring | Level 1 | U.S. government securities
Assets:
Cash equivalents	0	0
Recurring | Level 1 | Commercial paper
Assets:
Cash equivalents		0
Recurring | Level 2
Assets:
Marketable equity securities	0	0
Non-marketable debt securities	0	0
Derivative assets	7,255	1,579
Total assets	2,904,905	3,176,979
Liabilities:
Derivative liabilities	(1,458)	(1,639)
Total liabilities	(1,458)	(1,639)
Recurring | Level 2 | Corporate notes and bonds
Assets:
Short-term investments	1,079,287	1,059,181
Long-term investments	814,778	501,369
Recurring | Level 2 | U.S. government and agency securities
Assets:
Short-term investments	373,662	456,673
Long-term investments	198,126	153,065
Recurring | Level 2 | Commercial paper
Assets:
Short-term investments	135,091	307,856
Recurring | Level 2 | Certificates of deposit
Assets:
Short-term investments	117,948	185,163
Long-term investments		2,042
Recurring | Level 2 | Money market funds
Assets:
Cash equivalents	0	0
Recurring | Level 2 | Time deposits
Assets:
Cash equivalents	115,074	113,851
Recurring | Level 2 | Corporate notes and bonds
Assets:
Cash equivalents	10,834	4,466
Recurring | Level 2 | U.S. government securities
Assets:
Cash equivalents	52,850	388,670
Recurring | Level 2 | Commercial paper
Assets:
Cash equivalents		3,064
Recurring | Level 3
Assets:
Marketable equity securities	0	0
Derivative assets	0	0
Total assets	11,000	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 | Commercial paper
Assets:
Short-term investments	0	0
Recurring | Level 3 | Certificates of deposit
Assets:
Short-term investments	0	0
Long-term investments		0
Recurring | Level 3 | Money market funds
Assets:
Cash equivalents	0	0
Recurring | Level 3 | Time deposits
Assets:
Cash equivalents	0	0
Recurring | Level 3 | Corporate notes and bonds
Assets:
Cash equivalents	0	0
Recurring | Level 3 | U.S. government securities
Assets:
Cash equivalents	$ 0	0
Recurring | Level 3 | Commercial paper
Assets:
Cash equivalents		$ 0